Question

A gas is found to have molecular formula $(CO{)}_x$. Its vapor denisty is 70. The value of $x$ will be:

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is C 5

Molar mass $=2\times$Vapour density
Applying the above formula, the result can be calculated as :
Molar mass$=x\times 28$
$\therefore$ $70=$ $\frac{1}{2}\times 28\times x$

$\therefore x$ $=\frac{70\times 2}{28}$ $=5$