1. Solving Stechiometry Problems
When the equation is given?

2. 2 2 CuCl + H2S → Cu2S + HCl 0.2 mol = x 0.4 mol 0.4 mol x mol x mol
How many moles of Cu2S are produced when 0.4 moles of CuCl react ?
CuCl + H2S → Cu2S + HCl 2 2
0.4 mol
0.4 mol
x mol
x mol = x
2 mol
1 mol
0.2 mol
1. Balance the Equation
2. Place the relationship that the problem gives
3. Place the relation that the balanced equation gives
4.Solve the equation

3. 2 2 CuCl + H2S → Cu2S + HCl dm3 = x 26.5 dm3 26.5 dm3 x dm3 x dm3
How many dm3 of Cu2S are produced when 26.5 dm3 of CuCl react ?
CuCl + H2S → Cu2S + HCl 2 2
26.5 dm3
26.5 dm3
x dm3
x dm3 = x
2 mol
1 mol
dm3
1. Balance the Equation
2. Place the relationship that the problem gives
3. Place the relation that the balanced equation gives
4.Solve the equation

4. 2 2 CuCl + H2S → Cu2S + HCl g = x 35.2g 35.2g x g x g 2 mol 1 mol
How many grams of Cu2S are produced when 35.2 g of CuCl react ?
CuCl + H2S → Cu2S + HCl 2 2
35.2g
35.2g
x g
x g = x
2 mol
1 mol g
1. Balance the Equation
2. Place the relationship that the problem gives
3. Place the relation that the balanced equation gives
4.Solve the equation