Chemistry Question on Stoichiometry and Stoichiometric Calculations

Question

The strength of $50$ volume solution of hydrogen peroxide is _____ $g / L$ (Nearest integer)
Given: Molar mass of $H _2 O _2$ is $34\, g \, mol ^{-1}$ Molar volume of gas at $STP =22.7\, L$

Accepted Answer

The correct answer is 150
Molarity =11.3550
∴ Strength in gm/L=11.3550×34=150