Unit 7/Mole Review

How many moles of sodium chloride are in a 321.8 g sample?

• 18810 moles

• 3.315 x 10²⁴ moles

• 5.507 moles

• 4.767 moles

Which has more molecules?

• 1 mole H₂O

• 1 mole CH₄

• 1 mole Cl₂

• They're are all the same.

One mole of sulfur (S) is equal to home many atoms?

• 32 atoms

• 16 atoms

• 1.20 x 10²³ atoms

• 6.02 x 10²³ atoms

5.11 x 10²³ atoms of lithium (Li) is equal to how many moles?

• 1.18 moles

• 0.351 moles

• 1.34 moles

• 0.849 moles

Find the mass in grams of 2.25 x 10²⁴ atoms of calcium.

• 40.0 grams

• 255.1 grams

• 150 grams

• 9.02 x 10²⁴ grams

If I have 6.02 x10²³ molecules of CO₂, what is the mass?

• 44.0 g
• 2.65 x10²³ g
• 1.37 x10²² g
• 96.0 g

How many different elements are present in H₂COCH₂

• 5

• 4

• 3

• 2

The ______ are numbers found on the lower right-hand side of an element symbol.

• Coefficient

• Exponent

• Multiplier

• Subscript

1 mol Ag contain................................. atoms Ag

• 6.023 x 10²³ atoms

• 6.023 x10²⁴ atoms

• 6.023 x 10^-23 atoms

• 6.023 x 10^-24 atoms

What is the molar mass of PbSO₄

• 303.3 g/mol
• 294.7g/mol
• 163.8g/mol
• 372g/mol