Question

The largest no. of molecules are in:

• A. $36g{H}_{2}O$
• B. $28gCO$
• C. $46g{C}_2{H}_5$
• D. $54g{N}_2{O}_5$

Answer 1

The correct option is A $36g{H}_{2}O$

Number of moles of $H_{2}O=\frac{36}{18}=2$

Number of moles of $CO=\frac{28}{28}=1$

Number of moles of $C_2{H}_5=\frac{46}{29}=1.69$

Number of moles of $N_2{O}_5=\frac{54}{108}=0.5$

Number of molecules $=\text{n}umberofmoles\times N_A$

So, the number of moles is higher in the case of $H_{2}O$.

Hence, the number of molecules is largest in $H_{2}O$.

Option A is correct.