Calculate the concentration of a solution if 15 g of salt is added to 170 g of water.
Considering the definition of percentage by mass, the concentration of a solution if 15 g of salt is added to 170 g of water is 8.108 %.
Percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percentage by mass=\frac{mass of solute}{mass of solution}x100[/tex]
Concentration of the solutionIn this case, you know:
mass of solute= 15 gmass of water= 170 gmass of solution= mass of solute + mass of water= 15 + 170 g= 185 gReplacing in the definition of percentage by mass:
[tex]percentage by mass=\frac{15 grams}{185 grams}x100[/tex]
Solving:
percent by mass= 8.108 %
Finally, the concentration of a solution if 15 g of salt is added to 170 g of water is 8.108 %.
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If 10.0 moles of sulfur dioxide react with excess chlorine gas, what is the theoretical yield (in grams) of CI2O produced?
Answer:
869 g Cl₂O
Explanation:
To find the theoretical yield of Cl₂O, you need to (1) convert moles SO₂ to moles Cl₂O (via mole-to-mole ratio from reaction coefficients) and then (2) convert moles Cl₂O to grams Cl₂O (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the sig figs of the given amount (10.0 moles).
1 SO₂ (g) + 2 Cl₂ (g) ----> 1 SOCl₂ (g) + 1 Cl₂O (g)
Molar Mass (Cl₂O): 2(35.453 g/mol) + 15.998 g/mol
Molar Mass (Cl₂O): 86.904 g/mol
10.0 moles SO₂ 1 mole Cl₂O 86.904 g
------------------------ x ---------------------- x ------------------ = 869 g Cl₂O
1 mole SO₂ 1 mole
When testing the temperature of catalase, what would happen if you changed the temperature using the same tube with the same catalase and hydrogen oxide mixture?.
The substrate and enzyme would bind and react before all temperatures could be tested.
Before all temperatures could be tested, the enzyme would stop functioning after a short while.
What happens to the substrate and the enzyme?The enzyme and the substrate would bind and the reaction would breakdown hydrogen peroxide into hydrogen and oxygen. Once the majority of the substrate was consumed, the reaction would not proceed even if the enzyme was at the optimal temperature.
Specific substrate binding is a property of enzymes. For example, the enzyme catalase exclusively binds to hydrogen peroxide as a substrate.
The enzyme forms a complex with the substrate when it attaches to its active site, breaking down the substrate into products.
I understand the question you are looking for is this:
When testing the temperature of catalase, what would happen if you changed the temperature using the same tube with the same catalase and hydrogen oxide mixture?
The substrate would stop working after a few minutes before all temperatures could be tested.The enzyme would stop working after a few minutes before all temperatures could be tested.The substrate and enzyme would bind and react before all temperatures could be tested.Learn more about enzymes here:
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How much more uranium is there diffused in our oceans compared to what we can mine on land?
There is nearly 1000 times more uranium diffused in our oceans as compared to mine on land.
The world ocean contain more than 4 billion metric tons of dissolved uranium . Uranium is removed from ocean by diffusion across the sediment-water interface of organic-rich sediments.
Mining of Uranium on land.Uranium ore is deposits are economically recovered within earth crust. The uranium elements is common elements present in earth crust as it found 40 times more as compare to silver and 500 times more as compare to gold. It can found in everywhere in the rock , soil, river, and ocean.
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Gaseous nitrogen dioxide dissolved in warm liquid water to form hno3 and gaseous nitrogen monoxide enter a balanced equation for this reaction
Answer:
3 NO₂ (g) + H₂O (l) ---> 2 HNO₃ (aq) + NO (g)
Explanation:
Gaseous nitrogen dioxide = NO₂ (g)
Liquid water = H₂O (l)
Because the reactants are dissolved = HNO₃ (aq)
Gaseous nitrogen monoxide = NO (g)
In order for a reaction to be balanced, there needs to be an equal amount of each type of atom on both sides of the equation. The equation can be balanced by adding coefficients to modify the quantities of certain compounds.
The unbalanced equation:
NO₂ (g) + H₂O (l) ---> HNO₃ (aq) + NO (g)
Reactants: 1 nitrogen, 3 oxygen, 2 hydrogen
Products: 2 nitrogen, 4 oxygen, 1 hydrogen
The balanced equation:
3 NO₂ (g) + H₂O (l) ---> 2 HNO₃ (aq) + NO (g)
Reactants: 3 nitrogen, 7 oxygen, 2 hydrogen
Products: 3 nitrogen, 7 oxygen, 2 hydrogen
what is the formula n²o
Answer:
Nitrous oxide
Explanation:
Nitrous+ Oxygen (ygen becomes -ide when it is combined) = Nitrous oxide
just learnt these in school, hope this is correct
hii kiran hru my darling
Calculate the number of atoms in 3 mol helium
Answer:
1.81 x 10²⁴ atoms He
Explanation:
You can find the amount of atoms by multiplying the given moles by Avogadro's Number. This number represents the amount of atoms per 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units.
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
3 moles He 6.022 x 10²³ atoms
-------------------- x -------------------------------- = 1.81 x 10²⁴ atoms He
1 mole
Regions in the human genome where one nucleotide has been substituted for another in at least 1% of the population are called:_______
Regions in the human genome where one nucleotide has been substituted for another in at least 1% of the population are called single nucleotide polymorphism
What are nucleotides?Nucleotide can simply be defined as the basic building block of nucleic acids either RNA and DNA
Generally, nucleotides consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base.
A region is any considerable and connected part of a space or surface; specifically, a tract of land or sea of considerable but indefinite extent, a country, a district, in a broad sense, a place without special reference to location or extent but viewed as an entity for geographical, social or cultural reasons.
So therefore, regions in the human genome where one nucleotide has been substituted for another in at least 1% of the population are called single nucleotide polymorphism.
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i need help with these two questions, i been stuck for 2 hours
1. The mass of Fe2O3 required will be 51.29 grams
2. The mass of Cu that will be formed is 36 kg
Stoichiometric problems1) The equation of the reaction goes thus: [tex]2Fe_2O_3 + 3Pt --- > 3PtO_2 + 4Fe[/tex]
Mole ratio of Fe to Fe2O3 = 2:1
Mole of 35.9 g Fe = 35.9/56 = 0.6411 mol
Equivalent mole of Fe2O3 = 0.6411/2 = 0.3205 mol
Mass of 0.3205 mol Fe2O3 = 0.3205 x 160 = 51.29 grams
2) [tex]2CuO --- > 2Cu + O_2[/tex]
Mole ratio of CuO to Cu = 1:1
Mole of 45 kg CuO = 45000/80 = 562.5 mol
Equivalent mole of Cy = 562.5 mol
Mass of 562.5 mol of Cu = 562.5 x 64 = 36,000 grams or 36 kg
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What is the electron structure of a beryllium atom? 1s ²2s 1 O 1s 22s 2 1s ¹2s 2 1s 23s 2
Answer:
Be = 1s²2s²
Explanation:
Beryllium (Be) is the 4th element on the periodic table. As such, beryllium has 4 electrons. It is the second element located in the second row in the s-block. Therefore, beryllium's electron structure should consist of 2 completely filled s-orbitals.
Answer:
Explanation:
8281s
A certain mass of nitrogen gas occupies a volume of 8.56 L at a pressure of 3.72 atm. At what pressure will the volume of this sample be 10.94 L
The final pressure of the nitrogen gas with the increase in volume is 2.91 atm.
What is Boyle's Law?Boyle’s law is a gas law that states that the pressure exerted by a gas (of a given mass, kept at a constant temperature) is inversely proportional to the volume occupied by it.
The relation can be given as:
[tex]P_1V_1=P_2V_2[/tex]
The initial pressure of the gas, [tex]P_1[/tex] = 3.72 atm
The initial volume of the gas, [tex]V_1[/tex] = 8.56L
The final volume of the gas, [tex]V_2[/tex] = 10.94 L
Substituting the values, the final pressure [tex]P_2[/tex] is given as:
3.72 × 8.56 = [tex]P_2[/tex] × 10.94
[tex]P_2 =\frac{3.72 * 8.56}{10.94} \\\\P_2 =2.91 atm[/tex]
Therefore, the final pressure of the nitrogen gas with the increase in volume is 2.91 atm.
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Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemical? air water organic chemicals or materials compressed gases
Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemicals like alcohol, or charcoal.
An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. most Brønsted acids can act as oxidizing agents because the acidic proton can be reduced to hydrogen gas. a few acids include other structures that act as stronger oxidizing agents than hydrogen ions.
Oxidizing acids include concentrated perchloric acid, nitric acid, iodic acid, chromic acid, and the glass cleansing mixture of chromium trioxide and sulfuric acid.
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Grant plans to evaporate enough water from 22 gallons of a 16 mmonia solution to make a 24 mmonia solution. Which equation can he use to find n, the number of gallons of water he should remove?
He can use 3.52/22-n = 24/100 equation to find n, where n is the number of gallons of water.
Calculation of amount of ammonia in 22 gallon of 16% ammonia solution.
amount of ammonia = 16%×22 gallon = 3.53 gallon
The amount of ammonia remains the same after evaporation of water but the total amount of solution is reduced because solution contain ammonia as well as water . So, if water is evaporate then solution reduced.
Amount of water remains = 22 - n
Desired concentration, 24% = 24/100
Therefore the final equation becomes,
3.52/22-n = 24/100
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In a voltaic (galvanic) cell, oxidation occurs at the _____ and is where _____ in the salt bridge moves toward.
In a voltaic (galvanic) cell, oxidation occurs at the anode and is where anions in the salt bridge moves toward.
What is Galvanic Cell ?Galvanic Cell or Voltaic Cell is an electrochemical cell that converts the energy of spontaneous redox reactions into electrical energy. In galvanic cell oxidation occurs at the anode and reduction occurs at the cathode. The anode is positive and cathode is negative, anode attracts anions from solution in an electrolytic cell.
Thus from the above conclusion we can say that In a voltaic (galvanic) cell, oxidation occurs at the anode and is where anions in the salt bridge moves toward.
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(ii) Calculate the maximum mass of ethanol that could be obtained
g from 30.0 g of glucose.
Taking into account the reaction stoichiometry, 15.33 grams ethanol could be obtained from 30 grams of glucose.
Reaction stoichiometryIn first place, the balanced reaction is:
C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole C₂H₅OH: 2 molesCO₂: 2 molesThe molar mass of the compounds is:
C₆H₁₂O₆: 180 g/moleC₂H₅OH: 46 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₆H₁₂O₆: 1 mole ×180 g/mole= 180 gramsC₂H₅OH: 2 moles ×46 g/mole= 92 gramsCO₂: 2 moles ×44 g/mole= 88 gramsMass of C₂H₅OH formedThe following rule of three can be applied: if by reaction stoichiometry 180 grams of glucose form 92 grams of ethanol, 30 grams of glucose form how much mass of ethanol?
[tex]mass of ethanol=\frac{30 grams of glucosex 92 grams of ethanol}{180 grams of glucose}[/tex]
mass of ethanol= 15.33 grams
Then, 15.33 grams ethanol could be obtained from 30 grams of glucose.
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One type of acid-base buffer is composed of a weak , which will react with any added base, and its conjugate , which will react with any added acid.
One type of acid-base buffer is composed of a weak acid , which will react with any added base, and its conjugate base, which will react with any added acid.
The buffer's weak base and strong acid combine to form a weak acid, which changes the pH only little and releases few H ions into solution.
What is a Buffer solution ?A weak acid and the conjugate base of the weak acid, or a weak base and the conjugate acid of the weak base, are combined to form the buffer solution, a water-based solvent solution.
They withstand being diluted or having modest amounts of acid or alkali added to them without changing their pH.In order to maintain the moderate pH, buffers act by neutralising any additional acid (H+ ions) or base (OH- ions), making them a weaker acid or base.Learn more about Buffer solution here:
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How many sulfur dioxide molecules are in 2.8 moles of sulfur dioxide?
Answer:
1,69 x10²⁴
Explanation:
Answered it in the comments! ^^
Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant?
Boyle’s law
Dalton’s law
Charles’s law
Avogadro’s law
The law that states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant is Avogadro’s law. That is option D.
What is Avogadro’s law?Avogadro’s law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant.
Mathematically the Avogadro’s law can be represented by the following:
V1/n1= V2/n1
Where,
V1 = first volume
n1 = first amount of gas
V2 = second volume
n2 = second amount of gas
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Answer:D
Explanation:Trust me bro
The statement, in a mixture of gases, the total pressure is the sum of the individual partial pressures of gases in the mixture paraphrases ________.
Dalton's law
States that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture.
What is Dalton's law of partial pressure ?Dalton's law, which states that a gas mixture's overall pressure is equal to the sum of its component gases' partial pressures. The pressure that each gas would produce if it occupied the same volume of the mixture by itself at the same temperature is known as the partial pressure.
The pressure that each gas would produce if it occupied the same volume of the mixture at the same temperature alone is referred to as the partial pressure.Learn more about Dalton's law of partial pressure here:
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What amino acid is formed using the n-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?.
Threre are two amino acid is formed using the n-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step -
a. leucine
b. methionine
What is Gabriel malonic ester synthesis?
A reaction that enables us to generate amino acids is the Gabriel synthesis, also referred to as the Gabriel malonic ester synthesis. We can convert primary alkyl halides into primary amines using this procedure. Remember that 19 of the 20 amino acids are actually primary amines.Who should not take methionine?
Supplemental methionine shouldn't be used by people with the genetic condition homocystinuria type I. Methionine can become more homocysteine if you take methionine supplements without getting enough folic acid, vitamin B-6, or vitamin B-12. Your risk of heart disease could rise as a result.What does leucine do in the body?
Leucine is an essential amino acid for protein synthesis. Additionally, similarly to other amino acids, the carbon skeleton of leucine can be used to generate ATP. However, leucine can also regulate several cellular processes such as protein synthesis, tissue regeneration, and metabolism.Learn more about Gabriel malonic ester synthesis
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The complete question is -
What amino acid is formed using the N-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?
a. Ch3Ch(Ch3)Ch2-Br
b. Ch3SCh2Ch2-Br
A known amount of heat is transferred to a sample of iron and the iron raises its temperature by 4.0 degrees Celsius. What would be the temperature increase if the same amount of heat was transferred to the same mass of water
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Will give u brainliest!!!
part e
drop a single crystal of sodium acetate into the flask. observe the contents of the flask. what happens to the sodium acetate solution in the flask after you drop in the crystal?
Answer:
I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
Explanation:
I used this and scored 100% but if you copy and paste they will flag you for plagiarsm so make sure to rewrite it in your own words.
I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
What is Sodium acetate solution?Chemically known as CH3COONa, sodium acetate is a hygroscopic powder that is very water soluble. The addition of sodium acetate to products like heating pads, food, industries, and concrete is possible.
When administered intravenously, sodium acetate plays a critical role in medicine as an electrolyte replenisher. It is mostly recommended to treat hyponatremic patients' sodium levels. Additionally, it can be used to alkalinize urine and treat metabolic acidosis.
In patients with limited or no oral intake, salt should be added to high volumes of intravenous fluids to prevent or treat hyponatremia. for the patient's needs cannot be addressed by conventional electrolyte or nutrient solutions, it is also helpful as an addition for creating customized intravenous fluid formulas.
Therefore, I dropped a crystal of sodium acetate into the solution it immediately became cloudy again, it became supersaturated.
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How many grams of aluminum are required to react with 35 mL of 2.0 M hydrochloric acid, HCl?__ HCl + __ Al --> __ AlCl3 + __ H2
Answer:
0.6258 g
Explanation:
To determine the number grams of aluminum in the above reaction;
determine the number of moles of HCldetermine the mole ratio,use the mole ratio to calculate the number of moles of aluminum.use RFM of Aluminum to determine the grams required.Moles of HCl
35 mL of 2.0 M HCl
2 moles of HCl is contained in 1000 mL
x moles of HCl is contained in 35 mL
[tex]x \: mol \: = \: \frac{2 \: \times \: 35}{1000} \\ = 0.07 \: moles \: [/tex]
We have 0.07 moles of HCl.
Mole ratio
Balanced equation6HCl(aq) + 2Al(s) --> 2AlCl3(aq) + 3H2(g)
Hence mole ratio = 6 : 2 (HCl : Al
but moles of HCl is 0.07, therefore the moles of Al;[tex] = \frac{2}{6} \times 0.07 \\ \: = 0.0233333 \: moles[/tex]
Therefore we have 0.0233333 moles of aluminum.
Grams of Aluminum
We use the formula;
[tex]grams \: = moles \: \times \: rfm[/tex]
The RFM (Relative formula mass) of aluminum is 26.982g/mol.
Substitute values into the formula;
[tex] = 0.0233333 \: moles \: \times \: 26.982 \: \frac{g}{mol} \\ = 0.625799 \: grams[/tex]
The number of grams of aluminum required to react with HCl is 0.6258 g.
When a redox reaction that takes place in an acidic solution involves an oxygen imbalance, oxygen should be balanced by adding _____ as needed, while hydrogen should be balanced by adding _____.
Balancing redox reactions:
Oxygen should be balanced by adding [tex]H_{2}O[/tex] as needed, while hydrogen should be balanced by adding [tex]H^{+}[/tex].
What is a redox reaction?
Redox reactions, also known as oxidation-reduction reactions, involve the simultaneous oxidation and reduction of two different reactants.
The Half-Equation Method is one technique used to balance redox processes. The equation is divided into two half-equations using this technique: one for oxidation and one for reduction.
By changing the coefficients and adding [tex]H_{2}O[/tex], [tex]H^{+}[/tex], and [tex]e^{-}[/tex] in that order, each reaction is brought into equilibrium:
By putting the right number of water ([tex]H_{2}O[/tex]) molecules on the other side of the equation, the oxygen atoms are brought into balance.By adding [tex]H^{+}[/tex] ions to the opposing side of the equation, one can balance the hydrogen atoms (including those added in step 2 to balance the oxygen atom).Total the fees for each side. Add enough electrons ([tex]e^{-}[/tex]) to the more positive side to make them equal. (As a general rule, [tex]e^{-}[/tex] and [tex]H^{+}[/tex]are nearly always on the same side.)The [tex]e^{-}[/tex] on either side must be made equal; if not, they must be multiplied by the lowest common multiple (LCM) in order to make them equal.One balanced equation is created by adding the two half-equations and canceling out the electrons. Additionally, common terms should be eliminated.Now that the equation has been verified, it can be balanced.Learn more about redox reaction here,
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What titrant will be used to titrate the 0. 02 m hcl phenol red solution?
The NaOH will be used What titrant to titrate the 0. 02 m hcl phenol red solution.
Acid-base titrations may be the most typical titrations, although there are numerous more forms as well. Take a look at this illustration where sodium hydroxide is used to titrate a sample of hydrochloric acid (HCl) (NaOH). The titrant (NaOH), which is added gradually throughout the duration of the titration, has been added to the unknown solution.
Titrants are solutions with known concentrations that are added to solutions whose concentrations must be determined. The solution for whom the concentration needs to be determined is known as a titrant as well as analyte.
Therefore, the NaOH will be used as a titrant to titrate the 0. 02 m hcl phenol red solution.
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Consider the reaction. At 298 K, the equilibrium concentration of O2 is 1.6 x 10-2 M, and the equilibrium concentration of O3 is 2.86 x 10-28 M. What is the equilibrium constant of the reaction at this temperature
The value of the equilibrium constant is 1.99 × [tex]10^-^5^0[/tex] .
Given:
Concentration of [tex]O_2 = 1.6[/tex] × [tex]10^-^2 M\\[/tex]
Concentration of [tex]O_3 = 2.86[/tex] × [tex]10^-^2^8 M[/tex]
A chemical reaction known as an equilibrium reaction occurs when the reactants remain in a stable condition both during and after the reaction.
The given balanced equilibrium reaction is,
[tex]3O_2 (g) = 2O_3 (g)[/tex]
The expression for equilibrium constant will be,
[tex]K_c = \frac{[O_3] ^2}{[O_2]^3}[/tex]
Now put all the given values in this formula, and we get
[tex]K_c = \frac{(2.86 * 10^-^2^8] ^2}{[1.6 * 10 ^-^2]^3}[/tex]
[tex]K_c = 1.99[/tex] × [tex]10^-^5^0[/tex]
Therefore, the value of the equilibrium constant is 1.99 × [tex]10^-^5^0[/tex] .
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Entropy A. has a strong odor B. is a measure of correlation between numeric variables C. is used to calculate information gain D. is a measure of information gain
Correct option:
Entropy is used to calculate information gain.
What is entropy?
Entropy is the measure of data's uncertainty or randomness; the greater the randomness, the higher the entropy. Entropy is used by information gain to make choices. Information will increase if the entropy decreases.Decision trees and random forests leverage information gained to determine the appropriate split. Therefore, the split will be better and the entropy will lower the more information gained.Information gain is calculated by comparing the entropy of a dataset before and after a split.Entropy is a way to quantify data uncertainty. The goal is to maximize information gain while minimizing entropy. The method prioritizes the feature with the most information, which is utilized to train the model.Entropy is actually used when you use information gain.Learn more about entropy here,
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What is the general trend for atomic radius as you go down the noble gas family?
Answer:
the atomic radius is larger as you go down the noble gas family
23
What is the mass of 3.01 x 10 atoms of neon?
Answer:
10.0 g
Explanation:
Avogadro's law states that there are 6.02 × 10²³ molcules in one mole of a substance, so we know that this sample has half a mole of neon.
The atomic mass of neon is 20.1797 g/mol, so 0.5 mol has a mass of about 10.0 g.
it is 10.09 g
According to Avogadro;
1 mole of neon would have 6.022 x 10^23 atoms
3.0 x 10^23 atoms of neon would have:
3.0 x 10^23/6.022 x 10^23
= 0.5 moles
mass of 0.5 moles neon = mole x molar mass
= 0.5 x 20.18
= 10.09 g
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How many carbon monoxide molecules are in 0.75 moles of carbon monoxide?
Answer:
four 0.5 times 10 to the 23rd Adams of Neptune
Explanation:
Answer:
0.75 ( 6.02 × 10²³) = 4.515 x 10²³
Explanation:
0.75 ( 6.02 × 10²³) = 4.515 x 10²³