Question 1

What is the minimum mass of sulfur dioxide necessary to produce 200. g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

Accepted Answer

The answer of What is the minimum mass of sulfur...

Question 2

Washing soda is a hydrate of sodium carbonate. Elemental analysis of a sample of washing soda gave 4.20% C and 7.05% H. What is the formula for washing soda?

Accepted Answer

A) Na2CO3.2H2O 
B) Na2CO3.4H2O 
C) Na2CO3.6H2O 
D) Na2CO3.8H2O 
E) Na2CO3.H2O

Question 3

Which one of the following does not represent 1.00 mol of the indicated substance?

Accepted Answer

A) 6.02 * 1023 C atoms 
B) 26.0 g Fe 
C) 12.01 g C 
D) 65.4 g Zn 
E) 6.02 * 1023 Fe atoms

Question 4

What is the minimum mass of water necessary to produce 200. g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

Accepted Answer

The answer of What is the minimum mass of water...

Question 5

The first step in the Ostwald process for producing nitric acid is 
4NH3(g)+ 5O2(g) $\rarr$ 4NO(g)+ 6H2O(g).
If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO), what is the percent yield of this reaction?

Accepted Answer

A) 100% 
B) 49% 
C) 77% 
D) 33% 
E) 62%

Question 6

In the Haber process, hydrogen gas reacts with nitrogen gas to produce ammonia. How many kilograms of hydrogen would be required to react completely with 1.0 kg of nitrogen, and how many kilograms of ammonia would be formed?

Accepted Answer

The answer of In the Haber process, hydrogen gas reacts...

Question 7

What is the molar mass of acetaminophen, C8H9NO2?

Accepted Answer

A) 43 g/mol 
B) 76 g/mol 
C) 151 g/mol 
D) 162 g/mol 
E) 125 g/mol

Question 8

Aluminum hydroxide reacts with nitric acid to form aluminum nitrate and water. What mass of water can be formed by the reaction of 15.0 g of aluminum hydroxide with excess nitric acid?

Accepted Answer

A) 1.15 g 
B) 3.46 g 
C) 45.0 g 
D) 6.14 g 
E) 10.4 g

Question 9

How many moles of NH3 are there in 77.5 g of NH3?

Accepted Answer

A) 0.220 mol 
B) 4.55 mol 
C) 14.0 mol 
D) 1.31 * 103 mol 
E) None of the above.

Question 10

What is the average mass, in grams, of one potassium atom?

Accepted Answer

A) 5.14 * 10-23 g 
B) 6.49 * 10-23 g 
C) 6.02 * 10-18 g 
D) 31.0 g 
E) 39.1 g

Question 11

Common gases used in laboratories are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally-used gases, it is sometimes easier just to prepare them chemically. For example, oxygen gas can be prepared by heating KMnO₄(s)according to the following chemical reaction: 2KMnO₄(s) $\rarr$ K₂MnO₄(s)+ MnO₂(s)+ O₂(g) The above procedure was carried out starting with 93.2 g of KMnO₄, and it was later determined that all of the KMnO₄ reacted according to the above equation except 11.7 g. What was the percent yield for the reaction?

Accepted Answer

The answer of Common gases used in laboratories are generally...

Question 12

How many moles of Cl atoms are there in 65.2 g CHCl3?

Accepted Answer

A) 0.548 mol 
B) 1.09 mol 
C) 3.3 * 1023 mol 
D) 1.64 mol 
E) 3.0 mol

Question 13

How many fluorine atoms are there in 65 g of CF4?

Accepted Answer

A) 0.74 atoms 
B) 3.0 atoms 
C) 4.5 * 1023 atoms 
D) 1.8 * 1024 atoms 
E) 2.4 * 1023 atoms

Question 14

A 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is

Accepted Answer

A) CHO. 
B) CH7O3. 
C) C3H2O. 
D) C3H7O3. 
E) CH2O.

Question 15

The element oxygen consists of three naturally occuring isotopes: 16O, 17O, and 18O. The atomic mass of oxygen is 16.0 amu. What can be implied about the relative abundances of these isotopes?

Accepted Answer

A) More than 50% of all O atoms are 17O. 
B) Almost all O atoms are 18O. 
C) Almost all O atoms are 17O. 
D) The isotopes all have the same abundance, i.e. 33.3%. 
E) The abundances of 17O and 18O are very small.

Question 16

Commonly used gases in the laboratory are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally used gases, it is sometimes easier just to prepare them chemically as needed. For example, nitrogen monoxide, NO(g), can be prepared in the lab by the following chemical reaction: 3Cu(s)+ 8HNO₃(aq) $\rarr$2NO(g)+ 3Cu(NO₃)₂(aq)+ 4H₂O(l) If 5.0 g of copper metal was added to an aqueous solution containing 2.5 moles of HNO₃, how many moles of NO(g)would be produced, assuming a 100% yield.

Accepted Answer

The answer of Commonly used gases in the laboratory are...

Question 17

There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true?

Accepted Answer

A) Chlorine contains almost exclusively of  Cl, with very little  Cl. 
B) Chlorine contains more  Cl than  Cl. 
C) Chlorine contains roughly equal amounts of  Cl and  Cl. 
D) Chlorine contains more  Cl than  Cl. 
E) Chlorine contains almost exclusively of  Cl, with very little  Cl.

Question 18

Determine the number of moles of aluminum in 96.7 g of Al.

Accepted Answer

A) 0.279 mol 
B) 3.58 mol 
C) 7.43 mol 
D) 4.21 mol 
E) 6.02 * 1023 mol

Question 19

Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl. What is the empirical formula of phosgene?

Accepted Answer

The answer of Phosgene, a poisonous gas used during WWI,...

Question 20

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO₂ and 1.01 g of H₂O were produced. What is the empirical formula of the compound?

Accepted Answer

The answer of When a 0.860 g sample of an...

Exam 3: Stoichiometry

What is the minimum mass of sulfur dioxide necessary to produce 200. g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

Washing soda is a hydrate of sodium carbonate. Elemental analysis of a sample of washing soda gave 4.20% C and 7.05% H. What is the formula for washing soda?

Which one of the following does not represent 1.00 mol of the indicated substance?

What is the minimum mass of water necessary to produce 200. g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

The first step in the Ostwald process for producing nitric acid is 4NH₃(g) + 5O₂(g) $\rarr$ 4NO(g) + 6H₂O(g) . If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction?

In the Haber process, hydrogen gas reacts with nitrogen gas to produce ammonia. How many kilograms of hydrogen would be required to react completely with 1.0 kg of nitrogen, and how many kilograms of ammonia would be formed?

What is the molar mass of acetaminophen, C₈H₉NO₂?

Aluminum hydroxide reacts with nitric acid to form aluminum nitrate and water. What mass of water can be formed by the reaction of 15.0 g of aluminum hydroxide with excess nitric acid?

How many moles of NH₃ are there in 77.5 g of NH₃?

What is the average mass, in grams, of one potassium atom?

How many moles of Cl atoms are there in 65.2 g CHCl₃?

How many fluorine atoms are there in 65 g of CF₄?

A 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is

The element oxygen consists of three naturally occuring isotopes: ¹⁶O, ¹⁷O, and ¹⁸O. The atomic mass of oxygen is 16.0 amu. What can be implied about the relative abundances of these isotopes?

There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true?

Determine the number of moles of aluminum in 96.7 g of Al.

Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl. What is the empirical formula of phosgene?

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO₂ and 1.01 g of H₂O were produced. What is the empirical formula of the compound?

Exam 3: Stoichiometry

What is the minimum mass of sulfur dioxide necessary to produce 200. g of sulfuric acid in the following reaction? 2SO2 + O2 + 2H2O →\rarr→ 2H2SO4

Washing soda is a hydrate of sodium carbonate. Elemental analysis of a sample of washing soda gave 4.20% C and 7.05% H. What is the formula for washing soda?

Which one of the following does not represent 1.00 mol of the indicated substance?

What is the minimum mass of water necessary to produce 200. g of sulfuric acid in the following reaction? 2SO2 + O2 + 2H2O →\rarr→ 2H2SO4

The first step in the Ostwald process for producing nitric acid is 4NH3(g) + 5O2(g) →\rarr→ 4NO(g) + 6H2O(g) . If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction?

In the Haber process, hydrogen gas reacts with nitrogen gas to produce ammonia. How many kilograms of hydrogen would be required to react completely with 1.0 kg of nitrogen, and how many kilograms of ammonia would be formed?

What is the molar mass of acetaminophen, C8H9NO2?

Aluminum hydroxide reacts with nitric acid to form aluminum nitrate and water. What mass of water can be formed by the reaction of 15.0 g of aluminum hydroxide with excess nitric acid?

How many moles of NH3 are there in 77.5 g of NH3?

What is the average mass, in grams, of one potassium atom?

How many moles of Cl atoms are there in 65.2 g CHCl3?

How many fluorine atoms are there in 65 g of CF4?

A 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is

The element oxygen consists of three naturally occuring isotopes: 16O, 17O, and 18O. The atomic mass of oxygen is 16.0 amu. What can be implied about the relative abundances of these isotopes?

There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true?

Determine the number of moles of aluminum in 96.7 g of Al.

Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl. What is the empirical formula of phosgene?

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO2 and 1.01 g of H2O were produced. What is the empirical formula of the compound?

What is the minimum mass of sulfur dioxide necessary to produce 200. g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

What is the minimum mass of water necessary to produce 200. g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

The first step in the Ostwald process for producing nitric acid is 4NH₃(g) + 5O₂(g) $\rarr$ 4NO(g) + 6H₂O(g) . If the reaction of 150. g of ammonia with 150. g of oxygen gas yields 87. g of nitric oxide (NO) , what is the percent yield of this reaction?

What is the molar mass of acetaminophen, C₈H₉NO₂?

How many moles of NH₃ are there in 77.5 g of NH₃?

How many moles of Cl atoms are there in 65.2 g CHCl₃?

How many fluorine atoms are there in 65 g of CF₄?

The element oxygen consists of three naturally occuring isotopes: ¹⁶O, ¹⁷O, and ¹⁸O. The atomic mass of oxygen is 16.0 amu. What can be implied about the relative abundances of these isotopes?

When a 0.860 g sample of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO₂ and 1.01 g of H₂O were produced. What is the empirical formula of the compound?