Thee correct composition of a neutral atom of helium-4 is to consists two protons and two neutrons.
Helium-4 is a stable isotope of the element helium. It is by far the most abundant of her two naturally occurring isotopes of helium, accounting for about 99.99986% of the helium on Earth. Its nucleus is the same as an alpha particle, consisting of two protons and two neutrons. The atomic number of helium is 2. The 4 after the element name indicates the mass number of the helium 4 atom, and the neutral atom always has a number equal to the total number of protons and neutrons in its nucleus. Helium 4 atoms without electrons are alpha particles. Alpha particles are emitted from unstable nuclei.
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What is a catonic energy
Answer:
Low Energy
Hope it helps
So they are asking how human activities in nature will affect the availability in synthetic materials
Dickey created the first artificial materials with memory for a template in 1949 using a silica gel matrix.
What are synthetic material?By using colors as templates and acid precipitating aqueous sodium silicate solution, imprinted silica materials were created (e.g., methyl orange).
The study of imprinted silicates and metal oxide sol-gel continued in the years that followed, and simple amorphous silicates could be imprinted for various colors, N-heterocycle aromatics, proteins, and for resolution of enantiomers.
The gel structure and surface chemistry of these materials, both of which are controlled by a wide range of variables, including catalysts, pH, solvents, age, and the composition of precursors, determine their recognition properties.
Therefore, Dickey created the first artificial materials with memory for a template in 1949 using a silica gel matrix.
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How are changes in the number of electrons related to oxidized and reduced atoms molecules?
The changes in the number of electrons related to oxidized and reduced atoms molecules as the number of the electron decreases the species oxidized and electrons decreases the species reduced.
When the number of the electrons decreases the species gets reduced. When the number of the electrons increases the species get oxidized. The example is given as :
4Al + 3O₂ -----> 2Al₂O₃
The oxidation number of the aluminum , Al increases from the 0 to +3. The Aluminum is oxidized. It is called oxidation. The oxidation number of the oxygen decreases from the 0 to -2. The oxygen is reduced. It is called reduction.
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How many bonds does CH4 have?
There are four covalent bonds in CH4. In this, four electrons of carbon binds with the four hydrogen atoms to form 4 covalent bond.
In Methane, total four electrons are present in the valence shell of the carbon. The carbon can lose four electrons or gain its four electrons to obtain its stability. Due to high energy requirements the carbon cannot lose or gain electrons to form ions. So it forms a covalent bond with the atoms by sharing its four electrons with the four other atoms. The covalent bond is formed by the sharing of electrons between the atoms to form the compound. Energy released when bonds formed. The system becomes more stable. If carbon forms 4 bonds rather than 2, twice as much energy is released and so the resulting molecule becomes even more stable.
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Balance the following combustion reaction with the fuel methane (natural gas): Ch4 + O2 > CO2 + H2O
Balanced chemical equation is: CH4+2O2→CO2+2H2O.
What is a Balanced chemical equation?A balanced chemical equation has the same number of atoms of each element on the reactant and product sides of the equation.
The law of conservation of mass states that when a chemical reaction takes place, the mass of the products should be equal to the mass of the reactants. As a result, during the chemical reaction, the number of atoms in each element stays the same. As a result, the chemical equation must be balanced.
A chemical equation is a symbolic representation of a chemical reaction using symbols and chemical formulas.
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How many oxygen atoms are there in 1 mole of CaCO3?
There are 3 oxygen atoms present in 1 mole of CaCO₃.
Calcium carbonate (CaCO₃.), is a molecule containing one atom of calcium (Ca), one atom of carbon(C) and three atoms of Oxygen (O).
Mole is defined as the ratio of the mass of a given substance to the molar mass of that substance. Molar mass is the sum of all the individual atoms present in a molecule.
The molar mass of CaCO₃ is : ( 40 + 12 + 16×3 )g/mol = 100 g/mol
1 mole of any substance is equal to 6.022 × 10²³ atoms , molecules or ions present in it.
6.022 × 10²³ is known as Avogadro's number.
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difference in energy between reactants and products
For exothermic reactions, the H is negative and the products have less energy than the reactants. With regard to an endothermic process, the reverse is true.
To put it another way, the bond-breaking process absorbs more heat than the bond-forming process; the products have greater energies than the reactants; and H is a positive number.
The energy involved in chemical processes are the subject of energetics. There are two different kinds of energies: the first is related to thermodynamics and is the energy that is released or absorbed when the reactants transform into the products, and the second is related to the kinetics of the reaction and is the energy that the reacting molecules must have in order to pass the energy barrier for converting to the products.
The reactants' energy level is shown by the beginning point. Keep in mind that each substance contains an inherent energy that is expressed as temperature. The inherent energy of the molecules causes them to move about and collide with other molecules.
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fungus that contains the psychedelic compounds psilocybin and psilocin; been used for thousands of years as a hallucinogen. True Or False
Fungus that contains the psychedelic compounds psilocybin and psilocin; been used for thousands of years as a hallucinogen. This statement is true.
What is psilocybin known for ?Psilocybin is also called as magic mushrooms. They are naturally occurring, and they are consumed for their hallucinogenic effects.
They are used as psychedelic drugs, that means they can affect all the senses, converting a person's thinking, sense of time and emotions.
Thus, Fungus that contains the psychedelic compounds psilocybin and psilocin; been used for thousands of years as a hallucinogen. This statement is true.
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compound a can be converted to compound b according to the following reaction: if the reaction is at equilibrium, what is the correct expression for the equilibrium constant k?
The correct expression for the equilibrium constant k is K = [B]/[A], where [A] and [B] are the concentrations of compounds A and B respectively.
What is the correct expression for the equilibrium constant k?Compound A + Compound B <--> Compound C
K = [Compound C] / [Compound A] x [Compound B]
The equilibrium constant, denoted by k, is an expression that gives the ratio of the concentrations of products and reactants at equilibrium.In the reaction between compounds a and b, the equilibrium constant can be expressed as k = [b]/[a], where [b] and [a] denote the concentrations of compound b and compound a, respectively.The value of the equilibrium constant is determined by the reaction conditions, such as temperature, pressure, and concentrations of reactants and products.At equilibrium, the reaction rate of the forward and reverse reactions is equal, and the concentrations of reactants and products remain constant.Therefore, the equilibrium constant can be used to predict the proportions of reactants and products at equilibrium.To learn more about expression for the equilibrium constant k refer to:
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a flask containing 125 ml of hexanes is boiled at about 342 k. what happens during this process? the boiling point of hexanes is 68.73 °c.
During this process, the hexanes in the flask will boil and turn into vapour at their boiling point of 68.73 °C (342 °K). This occurs because the heat being applied to the flask causes the temperature of the hexanes to increase, and when it reaches the boiling point, the liquid will begin to turn into a gas.
The vapour will then rise and escape from the flask. As the vapour exits the flask, it will cool and eventually condense back into a liquid. This process is known as "boiling."
Hexanes in the flask will boil and turn into vapour because of the heat being applied. Vapor rises and escapes from the flask, then condenses back into liquid. This is a boiling process.
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what are the products for the net ionic reaction that would occur when an aqueous solution of h2so4 is combined with an aqueous solution of na3po4? [select all that apply.]group of answer choicesnaso4 (s)na2so4 (s)so42- (aq)h (aq)na (aq)h2po4 (aq)po43- (aq)h3po4 (aq)
The products for the net ionic reaction that would occur when an aqueous solution of H2SO4 is combined with an aqueous solution of Na3PO4 are: H3PO4 (aq), Na+(aq), SO42-(aq).
H2SO4 is a strong acid and Na3PO4 is a salt of a weak acid (H3PO4) and a strong base (Na+).
When H2SO4 is added to Na3PO4, H3PO4 will be neutralized by H2SO4 and forms H3PO4 and SO42-
Also, the Na3PO4 will dissociate in water forming Na+(aq) and PO43-(aq).
It's important to note that the products of the reaction will be the conjugate acid and conjugate base of the reactants, and they will be in an aqueous form.
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How much energy does it take to boil 100 mL of water? (Refer to table of
constants for water.)
A. 100 mL x 1g
1 mL
OB. 100 mL x
C. 100 mL x
OD. 100 mL x
1 g
1 mL
1 g
1 mL
1g
1 mL
X
X
X
X
1 mol
18.02 g
1 mol
18.02 g
1 mol
18.02 g
1 mol
18.02 g
x (-285.83 kJ)/mol = -1586 kJ
x 6.03 kJ/mol = 33.5 kJ
x 4.186 kJ/mol = 23.2 kJ
x 40.65 kJ/mol = 226 kJ
So 100ml of water has a mass of 100 grams. The change in temperature is (100°C - 27°C) = 73°C. Since the specific heat of water is 4.18J/g/°C we can calculate the amount of energy needed by the expression below. Energy required = 4.18 J/g/°C X 100g X 73°C = 30.514KJ.
What is energy?Scientists define energy as the ability to do work. Modern civilization is possible because people have learned how to change energy from one form to another and then use it to do work. People use energy to walk and bicycle, to move cars along roads and boats through water, to cook food on stoves, to make ice in freezers, to light our homes and offices, to manufacture products, and to send astronauts into space.Energy can be converted from one form to another. For example, the food you eat contains chemical energy, and your body stores this energy until you use it as kinetic energy during work or play. The stored chemical energy in coal or natural gas and the kinetic energy of water flowing in rivers can be converted to electrical energy, which can be converted to light and heat.
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Answer:1 00 mL x 1g/1 mL x 40.65 kJ/mol = 226 kJ
Explanation:
What is the molarity when 40 grams of hf is added to water to make a 500 ml solution?
Answer:
3.998 M
or, if considering significant figures,
4 M
Explanation:
Molarity is a unit of concentration used to express the concentration of a solution in terms of moles of solute per liter of solution. To calculate the molarity of a solution, we need to know the number of moles of solute present in the solution and the volume of the solution in liters.
We can use the formula:
Molarity = moles of solute / liters of solution
We are given the mass of the solute: 40 grams of HF. The molar mass of HF is 20.01 g/mol. By dividing the mass of HF by the molar mass of HF, we can obtain the number of moles of HF: (40 grams HF) / (20.01 grams HF/moles HF) = 1.999 moles HF.
The volume of the solution is given as 500 mL, which is equivalent to 0.5 L.
Now we can use the formula to calculate the molarity:
Molarity = moles of solute / liters of solution = 1.999 moles HF / 0.5 L = 3.998 M HF.
Therefore, the molarity of the solution when 40 grams of HF are added to water to make a 500-mL solution is 3.998 M.
Note that all numerical quantities in the question are given to one significant figure. So, if you must also consider significant figures, the molarity of the solution would be 4 M. Since it is not entirely clear whether you are to disregard significant figures for this question, I will provide you with both representations.
There are how many hydrogen atoms in 3C₂H5OH?
Answer:So the formula C2H5OH makes it very clear that there are 2 carbon atoms, 5 hydrogen atoms, 1 oxygen atom (if there is no numerical subscript you can assume the value is 1) and 1 further H atom.
i need help with this problem please
Assuming complete combustion, 1.10 mols of CO2 must have been created by the combustion of 0.55 mols of acetylene (C2H2). The solution is 26*0.55 ≈ 14.3 grams since acetylene has a molar mass of 26.
Who or what uses acetylene?Acetylene, the sole fuel gas that is suitable for welding, has numerous significant applications in the fabrication sector. In addition, it is perfect for many other processes like thermal spraying, brazing, cutting, fire gouging, spot warming, hardening, and texturing.
How come acetylene is so explosive?Acetylene can become exceedingly unstable in a variety of situations, including those involving heat, high pressure, and other factors, due to its rapid combustion rate. When the permitted pressure surpasses 15 psi, acetylene can potentially be explosive.
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How do you find the 1.00 mole of H2?
The 1 mole of the H₂ can be determine by dividing the mass to the molar mass of the H₂. The mass will be 2.0 g.
The number of the moles of the substance can be determine by the following formula is :
The number of the moles = mass / molar mass
The mass = moles × molar mass
The mass molar mass = 2 g/mol
The mass = moles × molar mass
The mass = 1 × 2
The mass = 2 g
Thus, the moles is equals to the mass divided by molar mass . The mass is 2 g.
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How many ionic bonds can oxygen form?
Usually oxygen forms 2 ionic bond and hence, termed as divalent molecule.
What is an ionic bond?The major interaction among ionic compounds is ionic bonding, which is a type of chemical bonding which involves the electrostatic attraction between two atoms or ions with dramatically differing electronegativities.
Divalent Molecule:Divalent molecules are those molecules whose atoms have two covalent bonds .Hence oxygen having two ionic bond is known as divalent molecule. Molecules like nitrogen is trivalent which means having three covalent bonds and carbon is a tetravalent molecule which means it has 4 or more covalent bonds.
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What chemical test can be used to confirm that the gas produced in a chemical reaction is carbon dioxide?
Lime water test can be used to confirm that the gas produced in a chemical reaction is carbon dioxide.
The gas being tested is bubbled through limewater in lime water test. Lime water is a mixture of water and calcium hydroxide. If the limewater turns a milky color the gas bubbled through it is may be carbon dioxide. The milky substance generated is calcium carbonate. It is the soluble compound. The gas Carbon dioxide is a chemical compound made up of molecules of one carbon atom covalently double bonded to two oxygen atoms. [tex]CO_{2}[/tex] is found in the gas state at room temperature. carbon dioxide is transparent to visible light in the air. It absorbs infrared radiation. It acts as a greenhouse gas.
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How does oxidation and reduction change oxidation numbers?
The oxidation and reduction change oxidation numbers as the loss of the electron is oxidation and it increases the oxidation number. The gain of the electrons is the reduction and it decreases the oxidation number.
The loss of the electrons is called as the oxidation . The gain of the electrons is called as the reduction. When the loss of the electron occur , the oxidation number increases and is called as the oxidation. When the gain of the electrons occurs it decreases the oxidation number and is called as reduction.
The oxidation number relates to the oxidation and reduction. The oxidation - reduction is called as the redox reaction.
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How many moles of CO2 is produced by combustion of 8g of methane?
The volume of CO2 produced when 8 g CH4 is burnt is 11.2 L.
When methane burns, it produces carbon dioxide and water. This can be written as:
CH4 + 2O2 → CO2 + 2H2O
Given enough oxygen, methane burns to produce carbon dioxide (CO2) and water (H2O). It is very useful as a fuel because it produces a lot of heat when burned. In methane combustion, molecular oxygen is the oxidant and methane is the reductant.
Molar mass of CH4 = 16g/mol
Lets convert gram of CO2 and CH4 to moles such that
1 mole of methane is 16 grams.
Let x be the amount of CO2 produced during combustion.
Ratio proportion :
[tex]8gCH4/16gCH4 = x CO2/22.4L CO2\\[/tex]
or x/22.4 = 8/16
x = 22.4/2 = 11.2 L
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What is the empirical formula of a compound that contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen?
The empirical formula of the compound is CH2O that can be calculated using the given percentages of the atoms.
In summary, empirical formula is derived from experimentally measured detail loads via way of means of: Deriving the wide variety of moles of every detail from its mass. Dividing every detail's molar quantity via way of means of the smallest molar quantity to yield subscripts for a tentative empirical components. The molecular components is maximum beneficial while you desire to recognize what number of atoms of the factors are gift withinside the compound.
In 100 g of the compound, mass of carbon = 40 g, that of hydrogen = 6.67 g and mass of oxygen = 53.33 g.
Ratio of number of atoms, C : H : O = 40/12 : 6.67/1.008 : 53.33/16 = 3.33 : 6.66 : 3.33 = 1 : 2 : 1.
So, the empirical formula of the compound is CH2O.
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31. calculation of pka an unknown compound, x, is thought to have a carboxyl group with a pka of 2.0 and another ionizable group with a pka between 5 and 8. when 75 ml of 0.1 m naoh is added to 100 ml of a 0.1 m solution of x at ph 2.0, the ph increases to 6.72. calculate the pka of the second ionizable group of x.
The pka of the second ionizable group of x 6.72.
Calculate the initial concentration of X at pH 2.0
The initial concentration of X can be calculated using the Henderson-Hasselbalch equation:
pH = pKa + log([X-]/[XH])
Rearranging this equation, we get:
[X-]/[XH] = 10^(pH - pKa)
Therefore, at pH 2.0, the ratio of X- to XH is 10^(2.0 - 2.0) = 1.
Calculate the concentration of X after 75 ml of 0.1 M NaOH is added.The concentration of X after 75 ml of 0.1 M NaOH is added can be calculated by using the following equation:
[X-] = [X] + [OH-]
Where [X] is the initial concentration of X, and [OH-] is the concentration of OH- ions from the added NaOH.Therefore, the concentration of X after 75 ml of 0.1 M NaOH is added is 0.1 + 0.1 = 0.2 M
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What type of reaction is Fe and O2?
The type of reaction is Fe and O2 is oxidation - reduction reaction. This also known as redox reaction.
In this reaction, the iron (Fe) is oxidized (loses electrons) to form iron(III) oxide (Fe2O3), while the oxygen (O2) is reduced (gains electrons) to form water (H2O).
4Fe + 3O2 ---> 2Fe2O3
Yes, an oxidation-reduction (redox) reaction is a type of chemical reaction in which the oxidation state of one or more atoms changes. Oxidation refers to the loss of electrons by a molecule or atom, while reduction refers to the gain of electrons. These two processes are closely related and often occur simultaneously in a redox reaction. The transfer of electrons from one species to another is the key feature of redox reactions. In the example I provided earlier, the iron loses electrons in the process of oxidation and the oxygen gains electrons in the process of reduction.
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valium is commonly used to treat anxiety, panic attacks, and other medical conditions. the molecule has 8 double bonds and 3 rings. how many hydrogen atoms would be in valium's formula, c16h?cln2o?'
A benzodiazepine is Valium (diazepam). Diazepam alters brain chemicals that may be out of balance in anxiety sufferers. Valium can be used to treat muscle spasms, anxiety disorders, and alcohol withdrawal symptoms.
What are the properties of valium molecule?A fast-acting medicine called valium can help you feel less anxious. To seek assistance for your anxiety, click the button below. The medication diazepam (Valium) is safe for usage by those over the age of 18.
However, you should discuss the best way to take the prescription with your doctor before taking it.
Therefore, The diazepam molecule has a total of 33 atoms, including 13 hydrogen atoms, 16 carbon atoms, 2 nitrogen atoms, 1 oxygen atom, and 1 chlorine atom (s).
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At 300 K, the pressure inside a gas-filled container is 500 kPa.
If the pressure inside decreases to 250 kPa, but the volume remains the same, what is the final temperature of the gas?
150 K
250 K
300 K
600 K
At 300 K, pressure inside the gas-filled container is the 500 kPa. If the pressure inside will decreases to 250 kPa, the final temperature of the gas is 150.6 K.
Give that :
The pressure P1 = 500 kpa
The temperature T1 = 300 K
The pressure P2 = 250 kpa
The temperature , T2 = ?
The temperature and the pressure relation at constant volume is given as :
P1 / T1 = P2 / T2
500 / 300 = 250 / T2
1.66 = 250 / T2
T2 = 250 / 1.66
T2 = 150.6 K
Thus, the final temperature is 15.6 K.
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what are the correct formulas and coefficients for the products of the following double-replacement reaction?
The correct formulas and coefficients for the products of the double-replacement reaction is 3 RbOH + H₃PO₄ ⇒ Rb₃PO₄ + 3 H₂O. The correct answer is C.
The positive and negative ions of two ionic compounds swap positions during a double-replacement reaction to create two new compounds. An example of a double-replacement reaction, also known as a double-displacement reaction, is:
AB+CD→AD+CB
A and C are positively charged cations in this process, whereas B and D are negatively charged anions. In aqueous solution, double-replacement reactions typically take place between compounds. A reaction must produce one of the following in order to take place: a solid precipitate, a gas, or a molecular substance like water.
Therefore, the formulas and coefficients for the products of the double-replacement reaction is 3 RbOH + H₃PO₄ ⇒ Rb₃PO₄ + 3 H₂O. the correct option is C.
Your question is incomplete but most probably your full question is What are the correct formulas and coefficients for the products of the following double-replacement reaction? RbOH + H₃PO₄ -->
a) Rb (PO₄)₃ + H₂O
b) RbPO₄ + 2H₂O
c) Rb₃PO₄ + 3H₂O
d) H₃Rb + PO₄OH
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what change would you expect on the rate of the sn2 reaction of 1-iodo-2-methylbutane with cyanide ion if the nucleophile concentration is unchanged and the alkyl halide concentration is doubled ? what change would you expect on the rate of the reaction of ethanol with 2-iodo-2-methylbutane if the nucleophile concentration is unchanged and the alkyl halide concentration is doubled ?
If the nucleophile concentration is unchanged and the alkyl halide concentration is doubled; the rate of reaction remains the same, it is unchanged.
The rate of reaction of tertiary alkyl halides with a nucleophile is independent of the concentration of the nucleopohile but depends only on the initial concentration of the alkyl halide, because tertiary alkyl halides reacts via SN1 mechanism.
For an SN2 reaction, the rate of reaction depends both on the alkyl halide concentration and the nucleophile concentration. If we unchange the concentration of the nucleophile and double the concentration of the alkyl halide, the rate of reaction just remains the same because the reaction is bimolecular.
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If 100.0 g of aluminum phosphide pellets are placed in a well-sealed closet and the air in the closet contains 50.0 g of water vapour, what is the percent yield of phosphine. if 23.8 g of it was collected after the reaction?
23.8 g ÷ 100.0 g x 100 = 23.8% yield of phosphine.
If following the reaction, 23.8 g of it were collected?The percent yield of phosphine is the ratio of the amount of phosphine collected after the reaction to the theoretical amount of phosphine that could have been produced.In this case, the reaction is between aluminum phosphide pellets and water vapour in a closed closet.The percent yield of phosphine is 23.8 g/24.2 g x 100% = 98.7%. This means that 98.7% of the theoretical amount of phosphine was produced in the reaction.This is a very high yield and suggests that the reaction was very efficient.The percent yield of phosphine gas produced from the reaction of 100.0 g of aluminum phosphide pellets with 50.0 g of water vapor in a well-sealed closet can be determined by calculating the ratio of the amount of phosphine produced to the amount of aluminum phosphide pellets used.The percent yield can then be calculated using this ratio. In this case, the percent yield is 23.8/100, or 23.8%. This means that, of the 100.0 g of aluminum phosphide pellets used, only 23.8 g of phosphine gas was produced. This indicates that the reaction was not very efficient. Factors such as temperature, pressure, and reactant ratio can all affect the efficiency of the reaction and should be taken into account in order to maximize the percent yield.To learn more about the percent yield of phosphine refer to:
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the chemical formula for lithium hydride is . a chemist measured the amount of lithium hydride produced during an experiment. she finds that of lithium hydride is produced. calculate the number of moles of lithium hydride produced. be sure your answer has the correct number of significant digits.
The chemical formula for lithium hydride is LiH. A chemist measured the amount of lithium hydride produced during an experiment. she finds that of 64.9 g lithium hydride is produced. The number of moles of lithium hydride produced is 8.21 moles
The moles of lithium hydride can be calculate as follows:
first we should calculate the mass molar oF LiH
mass molar LiH = atomic mass Li + atomic mass H
mass molar LiH 6.9 g/mol + 1 g/ mol = 7.9 g/mol
moles = mass / mass molar
moles of LiH = mass LiH / mass molar LiH
moles of LiH = 64.9/ 7.9 g/mol
moles of LiH = 8.21 moles
Therefore, the number of moles of lithium hydride produced is 8.21 moles
Your question is incomplete but most probably your full question was
The chemical formula for lithium hydride is LiH. A chemist measured the amount of lithium hydride produced during an experiment. she finds that of 64.9 g lithium hydride is produced. Calculate the number of moles of lithium hydride produced. Be sure your answer has the correct number of 3significant digits
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What should you expect when looking at a 1h nmr spectrum of a mixture of compounds?
When looking at a ¹H NMR spectrum of a mixture of compounds, we might expect the minor component to show up as smaller peaks in the spectrum. There are usually fewer protons to absorb in the spectrum when there are fewer molecules present.
The ¹H NMR spectra show that oxadiazines 4b-d exist as mixtures of two diastereomers in a CDCl3 solution (cis and trans isomers).
Understanding the fundamentals of NMR theory prepares us to move on to the most important and practical part of this section, which is elucidating the structure of a compound from ¹H NMR spectrum information. Let's start with a real-world ¹H NMR spectrum.
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