Question

if weight of gas at stp is 0.48g and volume is 100 cc, find molar mass

Answer 1

$$\begin{gathered} 100\mathrm{cc}\mathrm{of}\mathrm{the}\mathrm{gas}\mathrm{weighs}0.48\mathrm{g}\mathrm{at}\mathrm{S}.\mathrm{T}.\mathrm{P}. \\ \mathrm{So},(22.4\times 1000)\mathrm{cc}\mathrm{of}\mathrm{the}\mathrm{gas}\mathrm{weighs}\frac{22400}{100}\times 0.48 \\ \mathrm{Thus},\mathrm{molecular}\mathrm{mass}\mathrm{of}\mathrm{the}\mathrm{gas}\mathrm{is}\frac{22400}{100}\times 0.48=107.52\mathrm{g} \end{gathered}$$