Moonpark College » Chemistry » Chem R110 - Elementary Chemistry » Spring 2021

Question #1

What is the mass of 1.80 mol of Al(NO3)3?

A. 257 g

B. 161 g

C. 272 g

D. 383 g

Question #2

A 6.00g sample of calcium sulfide is found to contain 3.33g of sulfur. What is the percent by mass of calcium in the compound?

A. 35.7%

B. 28.6%

C. 80.2%

D. 44.5%

Question #3

The empirical formula of a compound:

A. None of these

B. indicates the structure of the molecule.

C. is the same as the molecular formula.

D. describes the mass relationships in a molecule.

E. indicates the simplest ratio of atoms in the compound.

Question #4

A 7.96 gram sample of silver reacts with oxygen to form 8.55 gram of the metal oxide. What is the formula of the oxide?

A. AgO

B. None of these

C. Ag2O

D. Ag3O

E. AgO2

Question #5

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

A. 2

B. None of these

C. 4

D. 9

E. 8

Question #6

How many grams of carbon are present in 45.0 g of CCl4?

A. 3.9005g carbon

B. 3.5135g carbon

C. 2.9515g carbon

D. 3.1115g carbon