The concentration of acetic acid:
The concentration of the acetic acid before titration is 0.128 M
What is titration?
Titration is a quantitative analytical procedure that works by allowing a known analyte to gradually react with a titrant until an endpoint is reached.
Titration for weak acid and strong base:
Moles of acetic acid = moles of NaOH
Given:
Concentration of NaOH = 0.1067 M
Volume of NaOH = 30.07 ml = 0.03007 L
Calculation:
So, by using the formula, Concentration = Moles/Volume
Moles of NaOH = concentration x volume = 0.1067 x 0.03007 = 0.0032
Therefore, the moles of acetic acid = 0.0032 mole
Now, using the formula again for determining the concentration of acetic acid, we get,
Concentration = Moles/Volume
Concentration of acetic acid = 0.0032/0.025 = 0.128M
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What mass of oxygen reacts during the incomplete combustion of 18.0 g of propane?
Answer:
45.82 gm O2
Explanation:
From your balanced equation in the first part, you can see that 2 moles propane need 7 moles O2
Find the number of moles of propane in 18 gm
mole wt of propane = ~ 12 * 3 + 8 *1 = 44 gm/mole
18 gm / 44 gm/mole = 9/22 gm/mole propane
we need 7/2 of this as O2 moles 7/2 * 9/22 = 1.432moles of O2
O2 mole weight =~ 32
1.432 moles * 32 gm/mole = 45.82 gm O2
Consider the reaction: icl(g) cl₂(g) → icl₃(s). the ∆g(f)° of icl(g) is -5.5 kj/mol and the ∆g(f)° of icl₃(s) is -22.59 kj/mol what is the ∆g° of the reaction, in kj/mol?
The ΔG° for the reaction in kJ/mol is -17.09.
Calculation,
The reaction is given below.
[tex]ICl(g)+Cl_{2} (g)[/tex] → [tex]ICl_{3} (s)[/tex]
The ΔG° for [tex]ICl(g)[/tex] = -5.5 kJ/mol
The ΔG° for [tex]ICl_{3} (s)[/tex] = -22.59 kJ/mol
The ΔG° for [tex]Cl_{2} (g)[/tex] = 0 kJ/mol ( change in gibb's free energy of standard state )
ΔG° for the reaction = ΔG° (product) - ΔG° (reactant)
ΔG° for the reaction = -22.59 kJ/mol - ( -5.5 kJ/mol + 0 kJ/mol )
ΔG° for the reaction = -17.09 kJ/mol
The value of change standard gibb's free energy for the standard state ( most stable form of elements) is zero.
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Calculate your % yield of co2 in the reaction based on the grams of nahco3 being the limiting reagent in the reaction.
The percent yield of CO₂ is 93.3%.
What is the percent yield of CO₂?The percent yield of a substance is given as follows:
Percent yield = actual yield/theoretical yield * 100 %The equation of the reaction is used to determine the theoretical yield.
NaHCO₃ + CH₃COOH → CH₃COONa + H₂O + CO₂Moe ratio of sodium bicarbonate and CO₂ is 1 : 1.
Given that sodium bicarbonate is the limiting reactant, the theoretical yield of CO₂ will be:
Moles of NaHCO₃ reacting = 2.01/84 = 0.0239 moles
Theoretical yield of CO₂ = 0.0239 moles * 22.4L/mol = 0.536 L
Actual yield = 0.50 L
Percent yield = 0.50/0.536 * 100%
Percent yield = 93.3%
In conclusion, the percent yield is the ratio of the actual yield and theoretical yield.
Note that the complete question is given below:
Calculate your % yield of co2 in the reaction based on the grams of nahco3 being the limiting reagent in the reaction between 2.01 g of sodium bicarbonate and 24.6 mL of 1.5 M acetic acid? They produce 0.50 L of at s.t.p.
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The oxidation number is often referred to as the _____. redox factor oxidation state spectator ion reducing factor
The oxidation number is often referred to as the oxidation state.
The number of electron/electrons which completely transferred and induced charged on an atom is called oxidation state of an atom. It is also describe as the number that is allocated to elements in a chemical combination. The number of electron that atoms in a molecule can share while forming chemical bonds with other atoms of a different elements. The oxidation number of the monoatomic (composed by atom) ion is the same as the charge of the ion.
The primary distinction between oxidation number versus oxidation state would be that the former refers to the charge that would be placed on the central atom of a coordination complex if every one of the connections around it were ionic bonds, while the latter relates to the number of electrons that an atom could either receive, lose, or share with some other atom.
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If an object has a temperature of 0 kelvin, how much energy is the object emitting? what is the wavelength of light emission according to wien's law?
This law (expressed mathematically as E = σT4) states that each gadget with temperatures above absolute zero (0K or -273°C or -459°F) emits radiation at a charge proportional to the fourth energy in their absolute temperature.
Wien's displacement law states that the black body radiation curve for one-of-a-kind temperatures height at a wavelength is inversely proportional to temperature.
Wien's displacement law It states that the better the temperature, the lower the wavelength λmax for which the radiation curve reaches its most. The shift to shorter wavelengths corresponds to photons of better energies. In other phrases, λmax (height wavelength) is inversely proportional to temperature.
Wien's regulation, named after the German Physicist Wilhelm Wien, tells us that gadgets of different temperatures emit spectra that height at distinctive wavelengths. hotter objects emit radiations of shorter wavelengths and for this reason, they seem blue.
Wien's regulation tells us that gadgets of various temperatures emit spectra that top at specific wavelengths. hotter gadgets emit a maximum of their radiation at shorter wavelengths; subsequently, they will seem like bluer. Cooler gadgets emit most of their radiation at longer wavelengths; consequently, they'll appear redder.
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When 3-methyl-2-butanone undergoes a baeyer-villiger oxidation reaction, the product is:_____.
When 3-methyl-2-butanone undergoes a baeyer-villiger oxidation reaction, the product is isopropyl acetate and methyl isobutyrate.
The Baeyer-villiger oxidation would seem to be a chemical reaction that uses peroxy acids using peroxides as the oxidant to transform a ketone into an ester or a lactone from such a cyclic ketone.
The main product produced by the Baeyer-Villiger oxidation of camphor using m-CPBA in buffer conditions could be created as a result of the migration of a tertiary bridgehead carbon as opposed to a methylene group.
By the reaction between 3-methyl-2-butanone with m-CPBA , will form isopropyl acetate and methyl isobutyrate.
It reaction can be shown as:
Therefore, when 3-methyl-2-butanone undergoes a Baeyer-villiger oxidation reaction, the product is isopropyl acetate and methyl isobutyrate.
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A molecule that contains delocalized electrons ________
Answer:
benzene molecule
Explanation:
The molecules exhibiting delocalization of electrons will have at least two resonance structures. These two resonance structure are having the equal energy.
What is resonance?Resonance is an electronic property of molecules by which, the sigma bond or pi bond moves from one location to other forming different mesomeric structures of the compound.
For example carbon dioxide can have two resonance structures.The lone pair in oxygen delocalize from one oxygen to the other. The double bond with carbon can be of either side of carbon. Thus one negative charge forms for one oxygen. This charge can be on the second hydrogen too.
In this way free electrons can delocalise through the orbitals and this process make the molecule more stable. The resonance structures together form the canonical structure which is the most probable and stable form of the compound.
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Engine cooling fluid is a. distilled water. b. tap water from a faucet. c. a mixture of alcohol and water. d. a mixture of antifreeze and water.
Engine cooling fluid is a mixture of antifreeze and water.
Hence option (d) is correct.
A liquid mixture of water and antifreeze called engine coolant is kept in your car's radiator.
Any compound that lowers water's freezing point is considered antifreeze and protects a system against the negative effects of ice formation.
Radiators are protected from deterioration by antifreezes, which are frequently added to water in car cooling systems.
It keeps your engine from freezing in extremely cold weather or overheating in hot weather, both of which can cause serious problems for an engine.
Although it's standard practice to combine water and antifreeze 50/50 in a car's cooling system, this guideline is not inflexible.
Mixtures can be changed to either raise the boiling point or lower the freezing point limit due to the wide range of weather conditions that cars can operate in.
Hence, Engine cooling fluid is a mixture of antifreeze and water.
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Alright, now you actually have an aqueous solution of your salt! Though perhaps not all of the salt has dissolved yet, but we'll get to that. How sure would you say you are about the concentration at this point?
a) What I've prepared is not yet an aqueous solution
b) It's not that accurate, but similar to what we need in the end
c) It's quite accurate
d) It's really inaccurate
If not all of the salt has dissolved then the measurement of the concentration at the time is really inaccurate.
What is concentration?The concentration is the amount of substance that is present in solution. We know that we can not measure the concentration unless all of the solute have been dissolved in the solution.
Thus, if not all of the salt has dissolved then the measurement of the concentration at the time is really inaccurate.
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What is the temperature of an 11. 2-l sample of carbon monoxide, co, at 744 torr if it occupies 13. 3 l at 55 °c and 744 torr?.
The temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr is 276 K or 3°C.
What is Charles's law?Charles's law states that, "When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion".
According to the given information:
V ∝ T
V/T = K
Where,
V is the volume of the gas,
T is the temperature of the gas (measured in kelvins), and
K is a non-zero constant.
In two different states, an initial state 1 and a final state 2, the equation is,
[tex]\frac{V 1}{T 1}=\frac{V 2}{T 2}[/tex]
Given data:
V1 = 11.2L
V2 = 13.3L
T2 = 55°C = 328K
By substituting the given data,
[tex]\begin{aligned}&\frac{11.2}{T 1}=\frac{13.3 L}{328 K} \\&T 1=\frac{11.2 L / 328 K}{13.3 L}\end{aligned}[/tex]
∴T1 = 276K = 3°C
The temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr is 276 K or 3°C.
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Taran wants to determine the mass of 7.3 moles of a compound. What additional information does Taran need
Answer: To determine the mass of the 7.3 moles of a compound Taran also needs to know the molar mass of the compound
Explanation: Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.
Add it all together and put units of grams/mole after the number.
It gives us the molar mass of the compound taken.
Multiply it with number of moles i.e., 7.3 moles, you will get the mass of the 7.3 moles of a compound.
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Which of the following atoms would be an ion?
A. An atom with 11 protons and 9 electrons.
B. An atom with 5 protons and 5 electrons.
C. None of these
D. An atom with 8 protons and 8 neutrons.
Answer:
best answer is D
Explanation:
if element has even number then protons and neutrons are same but if element has odd number then we should add 1 number in number of protons to know neutrons. but this rule is not work in 4 element that element are argon, nitrogen, hydrogen and one other
The table shows columns that brenda uses for her notes on the properties of elements. her notes state that some elements can react to form basic compounds. a 3-column table with 2 rows. the first row has entries metals, metalloids, nonmetals. the second row has entries nothing, nothing, nothing. where should brenda place this property in her table? only in the column for metalloids only in the column for nonmetals in the columns for metalloids and for nonmetals in the columns for metals and for metalloids
The element should be placed in the column for metalloids. Option A
What is the property of metals?We know that the properties of metals can be used to identify an unknown substances as a metal. We know that metals are able to react with acids to liberate the metal salt and hydrogen gas. Metals do not react with bases because they can not accept electrons.
Metalloids are generally amphoteric in nature. They can react with both the acid and the basses to form compounds. The nonmetals do not react with acid or base.
Looking at the result, we are told that the entry in the second row have the entries nothing, nothing, nothing. If this is the outcome, then it follows that the element should be placed in the column for metalloids.
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Answer: A
Explanation:
how do protons determine the identity of an atom
Explanation:
Proton is one of the subatomic particles which has a positive charge. The number of protons present will give the atomic number of the chemical element. Every element will have a unique atomic number. Thus, we can say that protons will determine the identity of an element.
How many moles of carbon are in 7.87x10^7 carbon atoms
?x10^?
Answer:
1.3 x10^-16
Explanation: answered it in your comments! :)
Water will expand more than ____________.
door
air
juice
Answer:
door
Explanation:
door I guess..................
A chemist want to prepare a solution containing (soluble) silver ions. Which salt should they use? silver nitrate AgCI AgOH silver carbonate 2 pts
Answer: silver nitrate
Explanation:
it is the only soluble salt listed.
The chemotherapy drug cis-platin, Pt(NH3)2Cl2, is prepared via the chemical reaction shown below.
(NH4)2PtCl4 + NH3 ---> Pt(NH3)2Cl2 + NH4Cl
What volume of 0.400 M NH3 (ammonia) is required to completely react with 25.00 mL of a 0.100 M solution of the platinum-containing starting compound, (NH4)2PtCl4?
Answer:
12.5 mL NH₃
Explanation:
To find the volume of NH₃, you need to (1) find the moles (NH₄)₂PtCl₄ (using the molarity equation), then (2) convert moles (NH₄)₂PtCl₄ to moles NH₃ (via mole-to-mole ratio from balanced equation, and then (3) find the volume NH₃ (using the molarity equation).
(Step 1)
25.00 mL / 1,000 = 0.025 L
Molarity = moles / volume (L)
0.100 M = moles / 0.025 L
0.0025 = moles (NH₄)₂PtCl₄
(Step 2)
The unbalanced equation:
(NH₄)₂PtCl₄ + NH₃ ----> Pt(NH₃)₂Cl₂ + NH₄Cl
Reactants: 2 nitrogen, 11 hydrogen, 1 platinum, 4 chlorine
Products: 2 nitrogen, 10 hydrogen, 1 platinum, 3 chlorine
The balanced equation:
(NH₄)₂PtCl₄ + 2 NH₃ ----> Pt(NH₃)₂Cl₂ + 2 NH₄Cl
Reactants: 3 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine
Products: 2 nitrogen, 14 hydrogen, 1 platinum, 4 chlorine
0.0025 moles (NH₄)₂PtCl₄ 2 moles NH₃
---------------------------------------- x ------------------------------ = 0.0050 moles NH₃
1 mole (NH₄)₂PtCl₄
(Step 3)
Molarity = moles / volume (L)
0.400 M = 0.0050 moles / volume
(0.400 M) x volume = 0.0050 moles
volume = 0.0125 L NH₃
0.0125 L x 1,000 = 12.5 mL NH₃
chegg You add a sprinkle of sugar (non-volatile solute) to a beaker of water; the vapor pressure of the solution, compared to the vapor pressure of the pure solvent before the sugar was added, will:
If a non-volatile sugar is added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it.
What occurs when a non volatile solute is added to a solution?In the case above, the vapor pressure of the solution is known to be lowered if compared to the vapor pressure of the pure solution.
Therefore if a non-volatile solute is said to be place or added to a pure solution such as water, the vapor pressure of the solution will be reduced than that of the pure solution.
Hence, the statement that If a non-volatile sugar is added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it is correct.
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129) Which of the following metals have the highest atomic mass?
A) Copper
B) Gold
C) Iron
D) Platinum
130) What does the atomic number of an element represent in an neutral atom?
A) Number of electrons and protons.
B) Number of electrons and neutrons.
C) Number of protons and neutrons.
D) Does not have a specific representation.
Answer:
B) Gold
A) Number of electrons and protons.
Explanation:
Atomic Masses (from periodic table):
----> Copper (Cu): 63.546 g/mol
----> Gold (Au): 196.97 g/mol
----> Iron (Fe): 55.845 g/mol
----> Platinum (Pt): 195.08 g/mol
The atomic number represents the number of protons. Neutral atoms have the same number of protons as electrons. The mass number represents the number of protons and neutrons.
Which statement is true about word equations with regards to chemical reactions?
The total mass of the reactants equals the total mass of the products
Which of the following is an indicator of a chemical reaction? CA. Changing states of matter (solid to liquid) CB. Two different compounds mixing and remaining separate CC. Increasing in temperature D. Decreasing in size
Answer:
All except 2nd one
Explanation:
States of matter changes in chemical reactionIn Exothermic reactions temperature increasesIn first order reactions or radioactive reactions size decreases because of decayAnswer:
CB. Two different compounds mixing and remaining separate is not correct!
Which describes the oxidizing agent in a chemical reaction?
the substance that is oxidized because it loses electrons
the substance that is reduced because it loses electrons
the substance that is oxidized because it gains electrons
the substance that is reduced because it gains electron
The oxidizing agent are the substance that is reduced because it gains electrons.
What is an oxidizing agent?An oxidizing agent is defined as the agent that is capable of undergoing oxidation reaction by losing an electron.
The following are the characteristics of an oxidizing agent:
At the end of the chemical reaction they are reduced,They gain electrons during chemical reaction.They can easily transfer their oxygen atoms.Learn more about electrons here:
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Answer:
D: the substance that is reduced because it gains electrons.
Explanation:
The iron atoms in the prosthetic groups of the electron transport chain proteins can easily accept and release ____
The iron atoms in the prosthetic groups of the electron transport chain proteins can easily accept and release electrons
A helper molecule, or prosthetic group, is a nonproteinaceous substance that aids in the activity of an enzyme. A particular type of cofactor molecule, or organic molecule, known as a coenzyme, aids enzymes in catalyzing chemical reactions.
a prosthetic group made comprised of a protoporphyrin ring and an iron (Fe) atom in the middle. Four pyrrole rings joined by methene bridges form a protoporphyrin ring.
Through their involvement in cellular respiration and fatty acid production, prosthetic groups support cellular activity. Holoproteins are the name for prosthetic groups that are attached to proteins. Prosthetic groups include, among others, heme, biotin, flavin, iron sulfides, copper, and ubiquinone.
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Two trains, A and B are moving at a speed of 20 km per hour
and 30 km per hour respectively. Which type of energy do
these two trains have?
Answer:
[tex]\fbox {kinetic motion}[/tex]
Explanation:
As the trains are clearly in motion, we can understand the these trains possess kinetic energy, which is by virtue of a motion of a body.
Answer:
type of energy that two train have are kinetic energy
Select the correct answer.
Given:
2AI + 6HCI-2AlCl3 + 3H2
If the chemical reaction produces 129 grams of AlCl3, how many grams of H₂ are also produced?
OA 1.22
OB. 2.92
OC. 3.02
OD. 3.65
Answer:
B.) 2.92
Explanation:
Tp find the mass of H₂ produced, you need to (1) convert grams AlCl₃ to moles AlCl₃ (via molar mass), then (2) convert moles AlCl₃ to moles H₂ (via mole-to-mole ratio from equation coefficients), and then (3) convert moles H₂ to grams H₂ (via molar mass). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units.
Molar Mass (AlCl₃): 26.982 g/mol + 3(35.453 g/mol)
Molar Mass (AlCl₃): 133.341 g/mol
2 Al + 6 HCl ---> 2 AlCl₃ + 3 H₂
Molar Mass (H₂): 2(1.008 g/mol)
Molar Mass (H₂): 2.016 g/mol
129 g AlCl₃ 1 mole 3 moles H₂ 2.016 g
------------------ x ------------------ x --------------------- x --------------- =
133.341 g 2 moles AlCl₃ 1 mole
= 2.93 g H₂
*our answers are most likely different due to using slightly different molar masses
The reduction of ketone groups, such as those present on coq, produces alcohols. in contrast, oxidation of aldehydes produces which functional group?
On oxidation of aldehydes produces carboxylic acid functional group.
The product of oxidation of aldehydes depends upon whether the reaction occur in acidic medium or alkaline condition.
If oxidation of aldehydes occurs under acidic condition the product is carboxylic acid but if oxidation of aldehydes occurs under alkaline condition then reduce as well as oxidized product obtained which is known as disproportional product.
The oxidation of aldehydes occur through potassium dichromate, potassium permanganate or many more. The oxidation of aldehydes in the presence of base is known as cannizzaro's reaction.
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Briefly explain how a titration experiment can be used to determine the concentration of a strong acid or strong base solution?
Answer:During an acid-base titration, an acid with a known concentration is slowly added to a base with an unknown concentration (or vice versa). A few drops of indicator solution are added to the base. The indicator will signal, by color change, when the base has been neutralizedExplanation:
Ammonium hydrogen sulfide (NH4HS) can decompose to ammonia and hydrogen sulfide: What is the equilibrium constant expression for this system
The equilibrium constant expression for this system is Keq=[NH3][H2S]
What is the the equilibrium constant expression of the system?The ratio of the equilibrium concentrations of the products to the concentrations of the reactants raised to their respective powers to match the coefficients in the equilibrium equation is K for a system in equilibrium, according to the law of mass action. The equilibrium constant expression is known as the ratio.
Therefore, the equilibrium constant expression for this system is Keq=[NH3][H2S]
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The partial pressure of oxygen in atmospheric air at sea level is Group of answer choices greater than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest. less than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest. equal to the partial pressure of oxygen in atmospheric air at the top of Mt. Everest.
A. The partial pressure of oxygen in atmospheric air at sea level is greater than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest.
What is partial pressure?Partial pressure is the pressure exerted by a component of mixture of gases.
Partial pressure of oxygen in different location of the EarthThe depth (distance from top to bottom) of the atmosphere is greatest at sea level and decreases at higher altitudes.
With greater depth of the atmosphere, more air is pressing down from above.
Air pressure is greatest at sea level and falls with increasing altitude.
Thus, the partial pressure of oxygen in atmospheric air at sea level is greater than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest.
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