Question

A gas is found to have a formula $[CO{]}_x$. If its vapour density is $70$, the value of $x$ is :

• A. 2.5
• B. 3.0
• C. 5.0
• D. 6.0

Answer 1

Answer: (C)

Molecular weight $=2\times$ vapour density
$=2\times 70$
$=140$
$\therefore$ ${(CO)}_x=140$
or ${(12+16)}_x=140$
or $28x=140$
$\therefore$ $x=5$