Question

A solution of hydrogen peroxide is 13.7% by mass. What is the molarity of the
solution? Assume that the solution has a density of 1.01 g/mL.

Answer 1

Moles of $H_2O_2=\frac{13.7}{34}=0.403moles$

$Density=1.01g/ml=1010g/l$

Litres of solution$=\frac{100}{1010}=0.099l$

Molarity$=\frac{0.403}{0.099}=4.07M$