Ch 9 The Mole REVIEW

How many grams are in 25 mol of calcium?

• 1001.95 g Ca

• 0.625 g Ca

• 65 g Ca

• 1010.79 g Ca

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆

How many atoms are in 162 g of lead?

• 5.782 × 10²³

• 4.588 × 10²³

• 2.735 × 10²³

• 1.294 × 10²³

How many moles are in 7.2 grams of carbon?

• 0.7625 mol C

• 0.599 mol C

• 86.479 mol C

• 74.396 mol C

What is the mass of 1.2 x 10²⁴ atoms of C?

• 2.0 grams

• 24 grams

• 0.17 grams

• 1.4 x 10²⁵ grams

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

•  NaPO₂

• Na₂PO₃

• Na₃PO₄

• NaPO₄

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

• NaPO₂

• Na₂PO₃

• Na₃PO₄

• NaPO₄

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

What is the empirical formula for N₂S₃?

• NS

• N₃S₂

• N₂S₃

• N₁S_1.5

What is the mass percentage of Carbon in Carbon dioxide (CO₂)?

• 27.27%

• 42.86%

• 72.73%

• 72.72%