Disilane is analyzed and found to contain $90.32\%$ silicon by mass. What is the value of $\mathrm{X} ?$ $[\mathrm{Si}=28]$

The disilane $S{i}_2{H}_X,$is analyzed and found to contain $90.32\%$ silicon by mass

$\frac{90.32}{28}:\frac{9.68}{1}=1:3$

Thus, the value of X is 6.