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

13.7g $H_2O_2$ in 100g solution

D=1.01 g/ml

$volume=\frac{100}{1.01}=99 \space ml$

moles of solute = $\frac{13.7}{34}=0.4$

$molarity=\frac{moles \space of\space solute} {v(L)}\\=\frac{0.4}{0.099}\\=4.04$