Chemical Quantities Review

What is the formula mass of CO₂?

• 44 grams
• 44 amu
• 0.44 grams
• 2.6 x 10²⁵ atoms

Which of the following is an empirical formula?

• C₃H₃
• Li₂CO₃
• Na₂O₂
• C₆H₁₂O₆

How many moles are contained in 45 grams of aluminum?

• 27 mol
• 1215 mol
• 1.7 mol
• 57 mol

How many atoms of are contained in a mole of sodium?

• 6.02 x 10²³ atoms
• 11 atoms
• 23 atoms
• 2 atoms

How many moles of chlorine gas are contained in 45 grams of pure sample?

• 35 mol
• 0.64 mol
• 1.3 mol
• 2.6 mol

How many moles are in 16.94g of water?

• 16.94 mol H₂O
• 0.9401 mol H₂O
• 305.3 mol H₂O
• 1.063 mol H₂O

A container with a volume of 893 L contains how many moles of air at STP?

• 20003.2 mol

• 39.9 mol

• 22.4 mol

• none of the choices

What is the percent composition of Benzene, C₆H₆?

• C = 50%
  H = 50%
• C = 85.7 %
  H = 14.3%
• C = 92.2%
  H = 7.8%
• C = 71.9%
  H = 28.1%

A chemical reaction produces 0.37 mol of N2 gas. What volume will that gas occupy at STP?

• 0.02 L

• 10.4 L

• 5.2 L

• 8.3 L

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula