Mole Calculations Study Guide 1 Name: Key

Period:

Gram to Mole Conversions

1)  1.34 g cupric chloride = 0.010 moles cupric chloride

2)  2.02 g helium = 0.505 moles helium

3)  40.0 g sodium hydroxide = 1.00 moles sodium hydroxide

4)  5.59 g iron = 0.10 moles iron

5)  32.0 g oxygen = 2.00 moles oxygen (as O)

Mole to Gram Conversions

1)  2.5 moles of hydrogen = 2.53 grams hydrogen (as H)

2)  0.10 moles potassium chloride = 7.455 grams

3)  1.50 moles sodium carbonate = 159 grams

4)  1.00 moles lithium chloride = 42.39 grams

5)  0.010 moles tungsten = 1.839 grams tungsten

Grams and Moles to Formula Mass

1)  0.100 moles of a compound has a mass of 3.207 g. Formula mass = 32.07 g/mol

2)  1.50 moles of a compound has a mass of 78.0 g. Formula mass = 52.0 g/mol

3)  1.00 moles of a compound has a mass of 28.02 g. Formula mass = 28.02 g/mol

4)  0.500 moles of a compound has a mass of 13.49 g. Formula mass = 26.98 g/mol

5)  0.100 moles of a compound has a mass of 6.539 g. Formula mass = 65.39 g/mol

Concentration to Moles

1)  1.50 L of a 3.50 M solution = 5.25 moles solute

2)  2.50 L of a 0.150 M solution = 0.375 moles solute

3)  550 mL of a 2.15 M solution = 1.18 moles solute

4)  445 mL of a 0.0550 M solution = 0.0245 moles solute

5)  2.00 L of a 0.250 M solution = 0.500 moles solute

Moles to Concentration

1)  0.550 moles of CaCl2 dissolved in 250 mL of water has a concentration of 2.2 moles/Liter

2)  1.25 moles of NaCl dissolved in 500 mL of water has a concentration of 2.5 moles/Liter

3)  0.050 moles of KOH dissolved in 1.00 L of water has a concentration of 0.050 moles/Liter

4)  2.25 moles of MgSO4 dissolved in 250 mL of water has a concentration of 9.0 moles/Liter

5)  0.150 moles of AlCl3 dissolved in 2.25 L of water has a concentration of 0.067 moles/Liter

Grams to Concentration

1)  How many grams of NaOH do you need to dissolve in 250mL of water to make a 0.40M solution?

0.25 L x 0.40 mol/L x 40.0 g/mol = 4.0 g NaOH

2)  What concentration of baking soda solution would you get if you dissolved 8.4g of NaHCO3 in 500mL of solution?

8.4 g/0.50L x 1 mol/84.01 g = 0.20 M

3)  How many grams of CaCl2 do you need to dissolve to make 1.0L of 0.55M solution?

1 L x 0.55 mol/L x 110.98 g/mol = 61.0 g