Question

A gas is found to have a formula $\left[CO\right]x$ . 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

The correct option is

C

5.0

$M.wt.=V.d.\times 2$

Where M.wt is molecular weight and V.d. is vapour density

$=70\times 2=140\Rightarrow x=\frac{m.wt.}{wt.of\left[CO\right]}=\frac{140}{[12+16]}=5$