A) How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O?

b) A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution. What volume of this solution must be diluted with water to make 1.00 L of 0.100 M CuSO4?

A) How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O?

C3H8 + 5O2 = 3CO2 + 4H2O

2.2 g C3H8 (1 mol / 44.11 mol) (5 mol O2 / 1 mol C3H8) = 0.25 mol O2

b) A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution. What volume of this solution must be diluted with water to make 1.00 L of 0.100 M CuSO4?

M1V1 = M2V2

[65.25 (1 / 249.7) / 0.800 L] (V1) = 0.100 (1.00 L)

V1 = 0.31 L or 310 mL