Question

Analysis of a metal chloride $XC{l}_3$ shows that it contains $67.2\%$ $Cl$ by mass. The molar mass of $X$ is __________.

Answer 1

Let, molar mass of X is $M$.
So,

Mass % of $Cl=\frac{3\times 35.5\times 100}{(M+3\times 35.5)}=67.1$

$M=52g$.

Thus, the molar mass of X is $52$ g