Question

Which of the following contains the least number of molecules ?

• A. $4.4gmof{CO}_2$
• B. $3.4gmof{NH}_3$
• C. $1.6gmof{CH}_4$
• D. $3.2gmof{SO}_2$

Answer 1

The correct option is D $3.2gmof{SO}_2$

Check option

$4.4gmC{O}_2$

$moles=\frac{4.4}{44}=\frac{1}{10}mol=0.1mol$

$3.4gmN{H}_3$

$moles=\frac{3.4}{17}=\frac{1}{5}mol=0.2mol$

$1.6gmC{H}_4$

$moles=\frac{1.6}{16}=\frac{1}{10}mol=0.1mol$

$3.2gmS{O}_2$

$moles=\frac{3.2}{64}=\frac{1}{20}mol=0.05mol$

Least number of molecules in $3.2gmS{O}_2$

Correct option is (D)