Question

$510$ mg of a liquid on vapourisation in Victor Mayer's apparatus displaces $67.2$ cc of dry air (at NTP). The molecular weight (in g/mol) of the liquid is :

• A. $130$
• B. $17$
• C. $1700$
• D. $170$

Answer 1

The correct option is D $170$

As we know,
V.D. = $\frac{510\times {10}^{-3}}{67.2\times 0.00009}=85$
$M_W=2\times V.D.=170$