The Mole Review WS Directions Period_____Date _______________

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The Mole Review WS Name ________________________

Period_____Date _______________

Directions : Complete the following problems. Make sure to show all work and use the correct number

of significant digits and put units on every number.

Draw a diagram showing the steps taken to complete stoichiometric problems.

1.

Determine the formula mass of aluminum chloride: ____________________

2.

Determine the molar mass of magnesium hydroxide: ________________________

3.

What is the mass of 0.882 moles of O

2

?

4.

How many formula units make up 4.5 g of calcium hydroxide?

5.

Convert 2.67 x 10 22 atoms of Na to moles of Na.

6.

Find the number of grams of hydrogen gas in 7.17 x 10

22 molecules of hydrogen gas.

7.

What volume will 57 grams of CO

2

gas occupy at STP?

3) 28.2 g 4) 3.7 x 10 22 fu 5) 0.0444 mol 6) 0.238 g 7) 29 L

8.

Determine the percentage composition of aluminum sulfate.

9.

A sample of an unknown compound with a mass of 2.876 g has the following composition:

66.07% carbon, 6.71% hydrogen, 4.06% nitrogen, and 23.16% oxygen. What is the mass of each element in this compound?

10.

Find the empirical formula for a compound which contains 6.5 g potassium, 5.9 g chlorine, and

8.0 g oxygen.

11.

The explosive, TNT, is composed of 37.0% carbon, 2.20% hydrogen, 18.5% nitrogen, and 42.3% oxygen. a) Determine the empirical formula for TNT. b) If the molar mass of TNT is 454 g/mol. What is the molecular formula for TNT?

8) 16% Al, 28% S, 56.1% O 9) 1.900 g C, 0.193 g H, 0.117 g N, 0.6661 g O 10) KCLO

3

11a) C

7

H

5

N

3

O

6

11b) C

14

H

10

N

6

O

12

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