638 Answered Questions for the topic AP chemistry

09/29/20

Hydrogen (H2) gas and oxygen (O2) gas react to form water (H2O) vapor. 
Hydrogen (H2) gas and oxygen (O2) gas react to form water (H2O) vapor. Suppose you have 5.0 mol of (H2) and 11.0 mol of (O2) in a reactor.Suppose as much as possible of the H2 reacts. How much will... more
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09/28/20

Calculate the largest amount of CO2 that could be produced.

Methane (CH4) gas and oxygen (O2) gas react to form carbon dioxide (CO2) gas and water (H2O) vapor. Suppose you have 9.0 mol of (CH4) and 3.0 mol of (O2) in a reactor.Calculate the largest amount... more
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09/28/20

What mass of oxygen gas is produced by the reaction of 4.09g of carbon dioxide?

Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water H2O and carbon dioxide CO2 chemically react to form the simple sugar... more
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09/28/20

What mass of octane is consumed by the reaction of 4.0 of oxygen gas?
A major component of gasoline is octane C8H18 When octane is burned in air, it chemically reacts with oxygen gas O2 to produce carbon dioxide CO2 and water H2O.What mass of octane is consumed by... more
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09/28/20

How many mL of 1.00 M sulfuric acid are required to neutralize 25.0 mL of 4.00 M NaOH?

How many mL of 1.00 M sulfuric acid are required to neutralize 25.0 mL of 4.00 M NaOH?(start by writing the balanced equation for this acid-base reaction)
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09/28/20

What is the percent yield of sodium sulfate (142.04 g/mol) from this reaction?
Consider the reaction of 32.18 g of sulfuric acid (98.08 g/mol) with excess sodium hydroxide to produce 37.91 g of sodium sulfate. What is the percent yield of sodium sulfate (142.04 g/mol) from... more
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09/28/20

Consider the reaction:
Consider the reaction i. Which is the limiting reactant if we start with 114 g of Al (26.98 g/mol) and 186 g of (70.9 g/mol)?ii. How much  (133.34 g/mol) can be made at most from these amounts of... more
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09/28/20

Determine the mass of water that will be obtained from combustion of 200.g of propane.
Consider the combustion of propane (44.1 g/mol) in the presence of excess oxygen.Determine the mass of water that will be obtained from combustion of 200.g of propane.C3H8 + 5O2 = 4H2O + 3CO2
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Ap Chemistry

09/25/20

GAS STOICHIMETRY
If 29.0L of octane, C9 H20, undergoes complete combustion at 0.961 atm and 200 C, how many liters of each gaseous product (carbon dioxide gas and water vapor gas) are formed? What mass of... more
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09/21/20

When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?
When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?a. Doubling the amount of... more
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Ap Chemistry Math Chemistry Biochemistry

09/21/20

need help with a homework problem, very advanced
Guanine is an essential component of DNA. It contains the elements carbon, hydrogen,nitrogen and oxygen. When 615 mg of guanine is burned, 895 mg of carbon dioxide and 183 mgof water are formed. In... more
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09/21/20

why do you assume 100 g of a substance when given percentages?
when given a problem and the elements of a compound are given in percentages, i don't understand why you can just assume that it's 100g of the compound. why couldn't it be 200g or 700g of the... more
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09/20/20

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.
When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.What is the enthalpy of solution of ammonium nitrate? Given, specific heat of solution... more
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Ap Chemistry Chemistry

09/20/20

Sodium nitrate in the original sample in %
A 0.4230 g sample of impure sodium nitrate (contains sodium nitrate plus inert ingredients) was heated, converting all the sodium nitrate to 0.2500 g of sodium nitrite and oxygen gas. Determine the... more
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09/20/20

Given the following salts and the corresponding enthalpy, predict whether the temperature will decrease or increase when the salt dissolves in water.
Given the following salts and the corresponding enthalpy, predict whether the temperature will decrease or increase when the salt dissolves in water.Ammonium Chloride (ΔHsol = +14.7 kJ/mol)
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09/20/20

Calculate the amount of salt in a commercial cold-pack containing ammonium nitrate (ΔHsol = + 25.7 kJ/mol) if the final temperature of the cold-pack is 0ºC.
Calculate the amount of salt in a commercial cold-pack containing ammonium nitrate (ΔHsol = + 25.7 kJ/mol) if the final temperature of the cold-pack is 0ºC. Assume that the initial temperature of... more
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09/20/20

When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?
When 1 g of a salt is dissolved in 50.0 g of water, the temperature increases by 2.5ºC. Which of the following changes will cause the temperature to increase by about 5ºC?a. Doubling the amount of... more
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09/20/20

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC. What is the enthalpy of solution of ammonium nitrate? Given, specific heat of solution... more
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09/20/20

What is the concentration expressed in ppm of a solution containing 0.036 g of sodium chloride (58.44g/mol) in 0.500 Liters of solution ? Assume the density of the solution to be 1.00g/mL.
What is the concentration expressed in ppm of a solution containing 0.036 g of sodium chloride (58.44g/mol) in 0.500 Liters of solution ? Assume the density of the solution to be 1.00g/mL.
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09/20/20

What volume of a 0.500 M solution of sucrose (342.3 g/mol) contains 22.4 g of sucrose?
What volume of a 0.500 M solution of sucrose (342.3 g/mol) contains 22.4 g of sucrose?
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09/20/20

What is the molarity (M)of a sodium chloride solution prepared by dissolving 20.0 g of sodium chloride (58.44g/mol) in water to give 45 mL of solution?
What is the molarity (M)of a sodium chloride solution prepared by dissolving 20.0 g of sodium chloride (58.44g/mol) in water to give 45 mL of solution?
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Ap Chemistry Chemistry

09/18/20

Alexander Fleming discovered penicillin:
C16H18N2O4S, in 1928 at the University of London. He isolated the compounds from a mold which had contaminated some of his experiments. Since then penicillin has been used as a general antibiotic... more
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Ap Chemistry Chemistry

09/18/20

Over the years, the thermite reaction has been used for welding railroad rails, in incendiary bombs, and to ignite solid fuel rocket motors.

The reaction isFe2O3(s) + 2Al(s) → 2Fe(l) + Al2O3(s)What mass of iron(III) oxide must be used to produce 76.73 g of iron? (Answer in grams)What mass of aluminum must be used to produce 76.72 g of... more
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Ap Chemistry Chemistry

09/18/20

Consider the following unbalanced chemical equation.

C5H12(l) + O2(g) → CO2(g) + H2O(l)If 40.0 grams of pentane (C5H12) are burned in excess oxygen, how many grams of H2O will be produced? ______ g H2OAlso,LiOH(s) + CO2(g) → Li2CO3(s) + H2O(l)If 87.7... more
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Ap Chemistry Chemistry

09/18/20

A compound with molar mass 110.1 g/mol has the following composition:
C 65.5%H 5.45%O 29.1%How would I do the math to determine the empirical formula?
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