Question

A chemist has synthesized a greenish yellow gaseous compound of chlorine and oxygen and finds that its density is 7.71 $g/L$ at 36${}^{0}C$ and 2.88 $atm$. Then molecular formula of the compound will be:

• A. $Cl{O}_3$
• B. $Cl{O}_2$
• C. $ClO$
• D. $C{l}_2{O}_2$

Answer 1

The correct option is B $Cl{O}_2$

As we know,
$P=\frac{dRT}{M_w}$

$M_w=\frac{7.71\times 0.0082\times 309}{2.88}=67.5$

So, Molecular formula $=Cl{O}_2$