Unit 8: The Mole REVIEW

How many molecules are in 2.5 mol of NaCl?

• 1.50 x10²⁴ molecules

• 1.50 molecules

• 4.15 molecules

• 1.51 x10²⁴ molecules

Calculate the number of atoms in 0.0340 g Zn.

• 5.20 x 10^-4 atoms Zn

• 3.13 x 10²³ atoms Zn

• 3.13 x 10²⁰ atoms Zn

• 1 atom Zn

Determine the molar mass for carbon tetrachloride (CCl₄).

• 153.81 g/mol

• 118.37 g/mol

• 189.35 g/mol

• 47.46 g/mol

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

The mass of one mole of a substance is called?

• Molecular mass

• Mole constant

• Molar Mass

• Atomic weight

Determine the mass in grams found in 3.5 moles of calcium.

• 21.07 g

• 0.58 g

• 140.28 g

• 114.51 g

How many moles are in 16.94g of water?

• 16.94 mol H₂O

• 0.94 mol H₂O

• 305.30 mol H₂O

• 1.06 mol H₂O

You have 8.65 x 10²⁵ atoms arsenic. How many grams do you have?

• 144 g As
• 10,765 g As
• 107 g As
• None of these

What is the mass of one mole of aluminum?

• 26.98 g

• 27 g

• 53.98 g

• 14.01 g

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

• 20003.21 L

• 39.87 L

• 22.40 L

• none of the choices