Question 1

One mole of lead(II)nitrate contains six moles of oxygen atoms.

Accepted Answer

A) True 
 B)False  True

Question 2

How many molecules of sulfur trioxide are in 78.0 grams?

Accepted Answer

A) 5.87 × 1023 
B) 7.33 × 1023 
C) 3.76 × 1027 
D) 0.974 
E) none of the above 
A) 5.87 × 1023 
B) 7.33 × 1023 
C) 3.76 × 1027 
D) 0.974 
E) none of the above A

Question 3

A molecule that has an empirical formula of HO and a molar mass of 34.02 gram must have a molecular formula of H2O2.

Accepted Answer

A) True 
 B)False  True

Question 4

The correct formula for calculating mass percent of X in compound XY is:   = Mass % X

Accepted Answer

A) True 
 B)False

Question 5

The molar mass of a compound in grams per mole is numerically equal to the formula mass of the compound in atomic mass units.

Accepted Answer

A) True 
 B)False

Question 6

Calculate the molar mass of calcium nitrate.

Accepted Answer

A) 136.03 g/mol 
B) 102.09 g/mol 
C) 132.10 g/mol 
D) 164.10 g/mol 
E) none of the above 
A) 136.03 g/mol 
B) 102.09 g/mol 
C) 132.10 g/mol 
D) 164.10 g/mol 
E) none of the above

Question 7

How many moles of Pb are in 4.71 × 1021 Pb atoms?

Accepted Answer

A) 0.00782 
B) 2.84 × 1045 
C) 207.2 
D) 6.022 × 1023 
E) none of the above 
A) 0.00782 
B) 2.84 × 1045 
C) 207.2 
D) 6.022 × 1023 
E) none of the above

Question 8

One mole of oxygen gas has a mass of ________ g.

Accepted Answer

A) 16.0 
B) 32.0 
C) 6.022 × 1023 
D) 8 
E) none of the above 
A) 16.0 
B) 32.0 
C) 6.022 × 1023 
D) 8 
E) none of the above

Question 9

One mole of argon has more atoms in it than one mole of neon.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is already in its empirical formula?

Accepted Answer

A) C22H34O10 
B) C6H6 
C) C6H12O3 
D) C5H12O2 
E) none of the above 
A) C22H34O10 
B) C6H6 
C) C6H12O3 
D) C5H12O2 
E) none of the above

Question 11

The empirical formula for C6H6 is C3H3.

Accepted Answer

A) True 
 B)False

Question 12

One mole of boron has a mass of ________ g.

Accepted Answer

A) 9.012 
B) 6.022 × 1023 
C) 5 
D) 10.811 
E) none of the above 
A) 9.012 
B) 6.022 × 1023 
C) 5 
D) 10.811 
E) none of the above

Question 13

If a sample of carbon dioxide contains 3.8 moles of oxygen atoms,how many moles of carbon dioxide are in the sample?

Accepted Answer

A) 1.9 
B) 3.8 
C) 7.6 
D) 11.4 
E) none of the above 
A) 1.9 
B) 3.8 
C) 7.6 
D) 11.4 
E) none of the above

Question 14

In comparing 1 mole of carbon atoms to one mole of magnesium atoms,which statement is TRUE?

Accepted Answer

A) The mass of 1 mole of carbon is greater than the mass of 1 mole of magnesium. 
B) The mass of 1 mole of magnesium is greater than the mass of 1 mole of carbon. 
C) The mass of 1 mole of carbon is the same as the mass of 1 mole of magnesium. 
D) There are more atoms in 1 mole of magnesium than in 1 mole of carbon. 
E) none of the above 
A) The mass of 1 mole of carbon is greater than the mass of 1 mole of magnesium. 
B) The mass of 1 mole of magnesium is greater than the mass of 1 mole of carbon. 
C) The mass of 1 mole of carbon is the same as the mass of 1 mole of magnesium. 
D) There are more atoms in 1 mole of magnesium than in 1 mole of carbon. 
E) none of the above

Question 15

Determine the empirical formula of a compound containing 83% potassium and 17.0% oxygen.

Accepted Answer

A) KO 
B) KO2 
C) K2O3 
D) K2O 
E) none of the above 
A) KO 
B) KO2 
C) K2O3 
D) K2O 
E) none of the above

Question 16

One mole of (NH4)2HPO4 contains how many moles of hydrogen atoms?

Accepted Answer

A) 4 
B) 2 
C) 8 
D) 9 
E) none of the above 
A) 4 
B) 2 
C) 8 
D) 9 
E) none of the above

Question 17

What is the mass percent of carbon in oxalic acid,H2C2O4?

Accepted Answer

A) 2.24 
B) 13.3 
C) 26.7 
D) 34.5 
E) none of the above 
A) 2.24 
B) 13.3 
C) 26.7 
D) 34.5 
E) none of the above

Question 18

The mole has a value of 6.023 × 1022.

Accepted Answer

A) True 
 B)False

Question 19

How many moles of iron are contained in 1.75 kg of iron?

Accepted Answer

A) 3.13 × 10-2 
B) 3.13 × 10-4 
C) 31.3 
D) 3.13 × 104 
E) none of the above 
A) 3.13 × 10-2 
B) 3.13 × 10-4 
C) 31.3 
D) 3.13 × 104 
E) none of the above

Question 20

One mole of water contains 6.022 × 1023 hydrogen atoms.

Accepted Answer

A) True 
 B)False

One mole of lead(II)nitrate contains six moles of oxygen atoms.

How many molecules of sulfur trioxide are in 78.0 grams?

A molecule that has an empirical formula of HO and a molar mass of 34.02 gram must have a molecular formula of H₂O₂.

The correct formula for calculating mass percent of X in compound XY is: = Mass % X

The molar mass of a compound in grams per mole is numerically equal to the formula mass of the compound in atomic mass units.

Calculate the molar mass of calcium nitrate.

How many moles of Pb are in 4.71 × 10²¹ Pb atoms?

One mole of oxygen gas has a mass of ________ g.

One mole of argon has more atoms in it than one mole of neon.

Which of the following is already in its empirical formula?

The empirical formula for C₆H₆ is C₃H₃.

One mole of boron has a mass of ________ g.

If a sample of carbon dioxide contains 3.8 moles of oxygen atoms,how many moles of carbon dioxide are in the sample?

In comparing 1 mole of carbon atoms to one mole of magnesium atoms,which statement is TRUE?

Determine the empirical formula of a compound containing 83% potassium and 17.0% oxygen.

One mole of (NH₄)₂HPO₄ contains how many moles of hydrogen atoms?

What is the mass percent of carbon in oxalic acid,H₂C₂O₄?

The mole has a value of 6.023 × 10²².

How many moles of iron are contained in 1.75 kg of iron?

One mole of water contains 6.022 × 10²³hydrogen atoms.

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

Exam 6: Chemical Composition

One mole of lead(II)nitrate contains six moles of oxygen atoms.

How many molecules of sulfur trioxide are in 78.0 grams?

A molecule that has an empirical formula of HO and a molar mass of 34.02 gram must have a molecular formula of H2O2.

The correct formula for calculating mass percent of X in compound XY is: = Mass % X

The molar mass of a compound in grams per mole is numerically equal to the formula mass of the compound in atomic mass units.

Calculate the molar mass of calcium nitrate.

How many moles of Pb are in 4.71 × 1021 Pb atoms?

One mole of oxygen gas has a mass of ________ g.

One mole of argon has more atoms in it than one mole of neon.

Which of the following is already in its empirical formula?

The empirical formula for C6H6 is C3H3.

One mole of boron has a mass of ________ g.

If a sample of carbon dioxide contains 3.8 moles of oxygen atoms,how many moles of carbon dioxide are in the sample?

In comparing 1 mole of carbon atoms to one mole of magnesium atoms,which statement is TRUE?

Determine the empirical formula of a compound containing 83% potassium and 17.0% oxygen.

One mole of (NH4)2HPO4 contains how many moles of hydrogen atoms?

What is the mass percent of carbon in oxalic acid,H2C2O4?

The mole has a value of 6.023 × 1022.

How many moles of iron are contained in 1.75 kg of iron?

One mole of water contains 6.022 × 1023 hydrogen atoms.

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

A molecule that has an empirical formula of HO and a molar mass of 34.02 gram must have a molecular formula of H₂O₂.

How many moles of Pb are in 4.71 × 10²¹ Pb atoms?

The empirical formula for C₆H₆ is C₃H₃.

One mole of (NH₄)₂HPO₄ contains how many moles of hydrogen atoms?

What is the mass percent of carbon in oxalic acid,H₂C₂O₄?

The mole has a value of 6.023 × 10²².

One mole of water contains 6.022 × 10²³hydrogen atoms.