What mass of hydrogen peroxide would be required to produce 22.4dm³ of oxygen at s.t.p?

The decomposition of hydrogen peroxide is represented by the equation: 2H2O(l) + O2(g) what mass of hydrogen peroxide would be required to produce 22.4dm³ of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm³)

A. 18 g
B. 34 g
C. 36 g
D. 64 g
E. 68 g

Correct Answer:

Option E – 68 g