Question

If Avogadro's number is A${}_0$, the number of sulphur atoms present in 200 mL of 1N H${}_2$SO${}_4$ is

• A. A${}_0$/5
• B. A${}_0$/2
• C. A${}_0$/10
• D. A${}_0$

Answer 1

The correct option is C

A${}_0$/10

Avogadro's number = A${}_0$
Normality = n${}_t$ $\times$ Molarity
1= 2 $\times$ M
M=$\frac{1}{2}mol{L}^{-1}$
Moles of H${}_2$SO${}_4$ = $\frac{1}{2}$ $\times$ 0.2 = 0.1 moles 21
Normality = 1; Volume = 200 ml (0.2 litre)
Moles of hydrogen = 0.2 moles
Moles of sulphur = 0.1 moles
Atoms = 0.1A${}_0$