Question

The number of molecules in 100ml of $0.02N$ $H_{2}SO_{4}$ is

• A. $6.02\times 10^{20}$
• B. $6.02\times 10^{16}$
• C. $6.02\times 10^{22}$
• D. $6.02\times 10^{21}$

Answer 1

Answer: (A)

Normality $=$ Molarity $\times $ valency factor (n)
$0.02=M\times 2$
Molarity $=\frac{N o . o f m o l e s}{V o l u m e i n l i t r e}$
$0.01=\frac{n}{0.1}=n=0.001$
1 mole of $H_{2}SO_{4}$ contains $6.023\times 10^{23}$ molecules.
So, 0.001 mole contains $6.023\times 10^{20}$ molecules.