HONORS CHEM The Mole PRE/POST Test

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

How many molecules in 22g of carbon dioxide?

• 3.01X10²³
• 6.02X10²³
• 0.5
• 2

What is the molar mass of Ca(NO₃)₂?

• 164.03 g/mole
• 228.32 g/mole
• 150.02 g/mole
• 218.05 g/mole

How many moles are in 225 g of CO?

• 28.01 mole
• 4.82 x 10²⁴ mole
• 6,302,25 mole
• 8.03 mole

What is the molar mass of Fe?

• 26 g/mole
• 55.85 g/mole
• 56 g/mole
• 6.02 x 10²³ g/mole

How many grams are in 1.5 moles of O?

• 9.03 x 10²³ grams
• 16 grams
• 24 grams
• 6.02 x 10²³ grams

How many carbon atoms are in 4.52 moles of carbon?

• 6.02 x 10²³ atoms
• 1.33 x 10²³ atoms
• 4.52 atoms
• 2.72 x 10²⁴ atoms

What is the percent composition by mass of sulfur in the compound MgSO₄ (molar mass = 120 g/mol)?

• 20%
• 27%
• 46%
• 53%

What is the percent by mass of chlorine in NaCl?

• 39%
• 61%
• 35%
• 65%

What are the units in molar mass?

• grams
• moles
• moles/gram
• grams/mole