Two elements, $\mathrm{X}$ (Atomic mass $16$) and $\mathrm{Y}$ (Atomic mass $14$) combine to form compounds $\mathrm{A}, \mathrm{B}$and $\mathrm{C}$. The ratio of different masses of $\mathrm{Y}$ that combine with fixed mass of $\mathrm{X}$ in $\mathrm{A}, \mathrm{B} \text{and} \mathrm{C}$ is $1 : 3 : 5$. If $32$ parts by mass of $\mathrm{X}$combine with $84$ parts by mass of $\mathrm{Y}$ in $\mathrm{B}$, in $\mathrm{C}, 16$ parts by mass of$\mathrm{X}$ will combine with _______________