Mole Calculations

Which has more molecules?

• 1 mole H₂O

• 1 mole Al(OH)₃

• 1 mole NaCl

• There are all the same

Determine the mass of 2.40 moles of C₆H₁₂

• 201 g

• 115 g

• 230. g

• 353 g

Select the correct answer. How many oxygen molecules are in 22.4 liters of oxygen gas at 273 K and 101.3 kPa?

• A. 6.023 × 10^23

• B. 1.2046 × 10^24

• C. 2.24 × 10^234

• D. 1.3491 × 10^25

Match the following volumes of water vapor at STP with the number of atoms.

• 336 liters

• 3.54846 × 10²⁴

• 131.97 liters

• 6.023 × 10²³

• 112 liters

• 1.0645 × 10²⁵

• 22.4 liters

• 3.548 × 10²⁴

What is the weight in grams of 1 mole of ammonium sulfate (NH₄)₂SO₄?

• 114.10 g

• 134.25 g

• 118.54 g

• 132.15 g

Select the correct answer. What is the weight in grams of 3.36 × 10^23 molecules of copper sulfate (CuSO4)?

• A. 5.55 g

• B. 89.03 g

• C. 8.903 g

• D. 0.5578 g

Select the correct answer. How many molecules are in 30 liters of methane (CH4) at STP?

• A. 4.033 × 10^24

• B. 4.033 × 10^23

• C. 8.06 × 10^24

• D. 8.06 × 10^23

Select the correct answer. How many atoms are in 1.4 mol of phosphorus trifluoride (PF₃)?

• 8.4 × 10²⁴

• 3.4 × 10²³

• 8.4 × 10²³

• 3.4 × 10²⁴

Select the correct answer. How many moles are in 68.5 liters of oxygen gas at STP?

• 3.058 mol

• 30.58 mol

• 0.3058 mol

• 305.8 mol

Select the correct answer. What is the volume of 19.87 mol of ammonium chloride (NH₄Cl) at STP?

• 4.45 l

• 445.088 l

• 4.45088 × 10²⁵ l

• 4.54 × 10²⁴ l