Mole Calculation Worksheet

Question

1) How many moles are in 15 grams of lithium?

2) How many grams are in 2.4 moles of sulfur?

3) How many moles are in 22 grams of argon?

4) How many grams are in 88.1 moles of magnesium?

5) How many moles are in 2.3 grams of phosphorus?

6) How many grams are in 11.9 moles of chromium?

7) How many moles are in 9.8 grams of calcium?

8) How many grams are in 238 moles of arsenic?

What are the molecular weights of the following compounds?

9) Na(OH) 12) H3(PO4)

10) H2O 13) Mn2Se7

11) MgCl2 14) (NH¬4)2SO4

15) How many grams are in 4.5 moles of sodium fluoride, NaF?

16) How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

17) How many grams are in 0.02 moles of beryllium iodide, BeI2?

18) How many moles are in 68 grams of copper(II) hydroxide, Cu(OH)2?

19) How many grams are in 3.3 moles of potassium sulfide, K2S?

20) How many moles are in 1.2 x 103 grams of ammonia, NH3?

21) How many grams are in 2.3 x 104 moles of calcium phosphate, Ca3(PO3)2?

22) How many moles are in 3.4 x 105¬ grams of silicon dioxide, SiO2?

23) How many grams are in 1.11 moles of manganese sulfate, Mn3(SO4)7?

Answer 1

Are you having that much trouble with mols? :-/. Don't sweat it.
Almost every problem comes down to mols. There are two ways to calculate mols.
1. When you have a solution of known molarity, then mols = M x L = ?

2. When you have a mass of something, then mols = grams/molar mass.

#2 will work every problem in this post except for calculating the molar mass and I assume you can add the atomic masses to find the molar mass of the compound listed.

Answer 2

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