Question

Find the molarity of four solutions with varying percentages of wt/vol H2O2. the percentages are 12% H202, 8%H202, 4% H202, and 2%H202

Answer 1

M = mol/V

assume a basis f 100 mL of H2O

so..

12 g of H2O2 per 100 mf of mix

mol = mass/MW = 12/34 = 0.352941 mol

M = mol/V = 0.352941/0.1 = 3.52941 M of H2O2

b)

8 g of H2O2 per 100 mf of mix

mol = mass/MW = 8/34 = 0.23529 mol

M = mol/V = 0.23529/0.1 = 2.3529 M of H2O2

c)

4 g of H2O2 per 100 mf of mix

mol = mass/MW = 4/34 = 0.11764 mol

M = mol/V = 0.11764 /0.1 = 1.1764 M of H2O2

d)

2 g of H2O2 per 100 mf of mix

mol = mass/MW = 2/34 = 0.0588 mol

M = mol/V = 0.0588/0.1 = 0.588M of H2O2