Molar Mass

What are the units for molar mass?

• grams
• moles
• grams/mole
• liters

Fluorine gas is diatomic. What is its molar mass? (recall from our class during the student strike)

• 18.998 g/mol

• 37.996 g/mol

• 9 g/mol

• 18 g/mol

Which compound has the smallest molar mass?

• CO
• CO₂
• H₂O
• H₂O₂

What is the mass of 1.8 mol of aluminum chloride?

• 26.98 g
• 62.43 g
• 133.34 g
• 240.01 g

How many grams are in 3.62 mol of dicarbon tetroxide?

• 88.0
• 3.62
• 319
• 159

Find the Molar Mass of:
Ga₂(SO₃)₃

• 280 g/mol
• 400 g/mol
• 380 g/mol
• 480 g/mol

The mole concept is important in chemistry because

• it allows us to distinguish between elements and compounds.
• atoms and molecules are very small and the mole concept allows us to count atoms and molecules by weighing macroscopic amounts of material.
• it establishes a standard for reaction stoichiometry.
• it provides a universally accepted standard for mass.

How much volume does 3 moles of chlorine gas occupy at STP? (hopefully you recall from your strike, 22L of gas = 1 mole of gas)

• 250 L

• 213 L

• 106.5 L

• 67.2 L

I need 9.20 x 10¹⁸ molecules of Fe₂O₃ to react with 1.2mg of Al. How many mg of of Iron (III) oxide to I need?

•  1.68 mg
• 1.26mg
• 2.46mg
• 3.02mg

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol