Question

$4$ $g$ of hydrogen and $128$ $g$ of hydrogen iodide are present in a $2$ litre flask. What are their active masses?

Answer 1

Mass of hydrogen $=4$ $g$
Molecular mass of hydrogen $=2$
Volume of the flask $=2$ litre
Active mass of hydrogen $=\frac{4}{2\times 2}=1$ $mol$ $L^{-1}$
Mass of $HI=128$ $g$
Molecular mass of $HI=128$
Volume of the flask $=2$ litre
Active mass of hydrogen iodide $=\frac{128}{128\times 2}=0.5$ $mol$ $L^{-1}$