The Mole Quiz

36.0 g of Be contains how many moles?

• 0.25 mol
• 4.0 mol
• 45 mol
• 320 mol

4.0 moles of H₂O would have what mass?

• 72 g
• 23 g
• 68 g
• 4.5 g

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.05 moles
• 1.81 x 10⁴⁶ moles
• 5.00 x 10²¹ moles
• 5.00 moles

Which formula is an empirical formula?

• N₂O₄

• NH₃

• C₃H₆

• P₄O₁₀

What is the percent composition by mass of nitrogen in the compound N₂H₄ ( gram formula mass = 32g/mol)

• 13%

• 44%

• 88%

• 93%

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²³
• 146
• 4.15
• 1.51x10²⁴

Calculate the molar mass of CO₂.

• 14 g/mol

• 28 g/mol

• 36 g/mol

• 44 g/mol

How do you find the molar mass of a compound?

• Find the atomic mass of the elements in the compound and add them together.

• Guess the molar mass.

• Add together the atomic number of each element.

What is the molar mass of C?

• 12.01 g/mol

• 15 g/mol

• 20 g/mol

• 14.01 g/mol

How many atoms of iodine are in a mole of iodine?

• 53
• 63.55g
• 126.9
• 6.02 x 10²³