Question

The number of moles of oxygen obtained by the electrolytic decomposition of $108 \,g$ water is

• A. 2.5
• B. 3
• C. 5
• D. 7.5

Answer 1

Answer: (B)

3

Answer 2

$\because 36 \,g$ of $H _{2} O$ produce $1$ mole of oxygen $\therefore 108\, g$ of water will produce oxygen $=\frac{108}{36}=3\, mol$