02.04 The Mole and Conversion: Dimensional Analysis Practice—Text Version

Question One: How many moles of aluminum (Al) are equivalent to 3.7 × 10²³ power atoms?

Question Two: What is the mass of 5.82 moles of argon (Ar)?

Question Three: How many atoms of bromine (Br) are in a sample of 9.81 mol Br?

Question Four: How many moles of calcium (Ca) atoms are in a sample of 72.5 g Ca?

Question Five: How many atoms of chlorine (Cl) are in a sample of 68.7 g Cl?

Question Six: What is the mass of 2.01 × 10²¹ atoms of bromine (Br)?

Question Seven: How many atoms of calcium (Ca) are in 52.3 g Ca?

Question Eight: What is the mass of 1.83 × 10²⁵ atoms of silver (Ag)?

Check your answers:

Question One: How many moles of aluminum (Al) are equivalent to 3.7 × 10²³ atoms?

3.7 × 10²³ atoms Al times fraction: 1 mol Al over 6.022 × 10²³ atoms Al = 0.560 mol Al

Question Two: What is the mass of 5.82 moles of argon (Ar)?

5.82 mol Ar times fraction: 39.948 g Ar over 1 mol Ar equals 232 g Ar

Question Three: How many atoms of bromine (Br) are in a sample of 9.81 mol Br?

9.81 mol Br times fraction: 6.022 × 10²³ atoms Br over 1 mol Br equals 5.91 × 10²⁴ atoms Br

Question Four: How many moles of calcium (Ca) atoms are in a sample of 72.5 g Ca?

72.5 g Ca times fraction: 1 mol Ca over 40.078 g Ca equals 1.81 mol Ca

Question Five: How many atoms of chlorine (Cl) are in a sample of 68.7 g Cl?

68.7 g Cl times fraction: 1 mole Cl over 35.453 g Cl × fraction: 6.022 × 10²³ atoms Cl over 1 mole Cl equal 1.17 × 10²⁴ atoms Cl

Question Six: What is the mass of 2.01 × 10²¹atoms of bromine (Br)?

2.01 × 10²¹ atoms Br times fraction: 1 mol Br over 6.022 × 10²³ atoms Br times fraction: 79.904 g Br over 1 mol Br equals 0.267 g Br

Question Seven: How many atoms of calcium (Ca) are in 52.3 g Ca?

52.3 g Ca times fraction: 1 mol Ca over 40.078 g Ca times fraction: 6.022 × 10²³ over 1 mole Ca equals 7.86 × 10²³ atoms Ca

Question Eight: What is the mass of 1.83 × 10²⁵atoms of silver (Ag)?

1.83 × 10²⁵ atoms Ag times fraction 1 mole Ag over 6.022 × 10²³ atoms Ag times fraction: 107.86 g Ag over 1 mol Ag equals 3208 g Ag