ADDITIONAL PRACTICE PROBLEM SOLUTIONSFrom chemistry class 3/30

ADDITIONAL PRACTICE PROBLEMS

1. How many moles are equal to 9.03 x 1024 atoms of mercury?

2. How many atoms are in 1.00 mole of sucrose, C12H22O11?

3. How many atoms of O are in 3.65 moles of C12H22O11?

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ANSWERS TO PRACTICE PROBLEMS

1. 9.03 x 1024 atoms x 1 mole

1 6.02 x 1023 atoms

= 15.0 moles

2. 1.0 mole x 6.02 x 1023 mlcs x 45 atoms

1 1 mole 1 mlc

= 2.71 x 1025 atoms

3. 3.65 mol x 6.02 x 1023 mlcs x 11 atoms of O

1 1 mole 1 mlc C12H22O11

= 2.42 x 1025 atoms O

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ADDITIONAL PRACTICE PROBLEMS1. What is the mass, in grams, of 1.72 mol CaCl2?

2. Determine the mass of one mole of each of the following compounds and give their names.

(Fill in the chart)

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ANSWERS TO PRACTICE PROBLEMS1. 1.72 mol x 110.98 g

1 1 mol

= 190.89 g

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ANSWERS TO PRACTICE PROBLEMS

Compound Mass in One Mole

Name

a. CO2 44.01 g carbon dioxide

b. SO3 80.07 g sulfur trioxide

c. NaOH 40.01 g sodium hydroxide

d. Al2(SO4)3 342.17 g aluminum sulfate

e. Ba(NO3)2 261.35 g barium nitrate

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ADDITIONAL PRACTICE PROBLEMS

1. Calculate the mass in grams for 0.250 mol of each of the following compounds:

a. sucrose (C12H22O11)b. sodium chloridec. potassium permanganate

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ANSWERS TO PRACTICE PROBLEMS1. Calculate the mass in grams for 0.250 mol of each of the following compounds:

a. sucrose (C12H22O11)

0.250 mol x 342 g = 85.50 g C12H22O11

1 1 mol

b. sodium chloride

0.250 mol x 58.5 g = 14.63 g NaCl

1 1 mol

c. potassium permanganate

0.250 mol x 158 g = 39.50 g KMnO4

1 1 mol

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