Chemistry - Mole Concept Question with Solution | TestHub

Organic compound $\stackrel{\text{ combustion }}{\to }\underset{\begin{array}{c}0.9\mathrm{gm}\end{array}}{{\mathrm{H}}_2\mathrm{O}}$ $\therefore$ mole of ${\mathrm{H}}_2\mathrm{O}=\frac{0.9}{18}=0.05\mathrm{mole}$ $\therefore$ mole of H in ${\mathrm{H}}_2\mathrm{O}=0.05\times 2=0.1$ mole $=$ mole of H in 0.01 mole Organic compound $\therefore$ wt of H atom in 0.01 mole compound $=0.1\times 1$ $=0.1\mathrm{gm}$ $\therefore$ wt of H atom in one mole compound $=\frac{0.1}{0.01}=10\mathrm{gm}$ $\because \mathrm{wt}.\%$ of $\mathrm{H}=\frac{\mathrm{wt}\text{. of }\mathrm{H}\text{ in one mole compound }}{\text{ Molar mass of compound }}\times 1$ $\begin{array}{rl}& 10=\frac{10}{M}\times 100\\ & \therefore M=100\end{array}$