Question

When 3.2 $g$ of sulphur is vaporised, it gives 280 $ml$ of vapor at 273${}^{o}C$ and 1520 $mm$ pressure. Molecular formula of sulphur is:

• A. $S_4$
• B. $S_2$
• C. $S_8$
• D. $S$

Answer 1

Answer: (C)

$S_8$

$M=\frac{WRT}{PV}=\frac{3.2\times 0.082\times 546}{0.28\times 2}$

$M=255.8=256$

Atomicity $=\frac{M}{32}$

Molecular formula of Sulphur is $S_8$

Option C is correct.