Question

To produce $160g$ of oxygen, the number of moles of water required to be electrolysis is:

• A. $2.5$
• B. $5$
• C. $10$
• D. $20$

Answer 1

The correct option is C $10$

$H_{2}O⟶H_2+\frac{1}{2}{O}_2$

$1$ mole $H_{2}O$ gives $0.5$ mole $O_2$

Moles of oxygen for 160 g=$\frac{160}{32}=5$ moles

$\therefore$ Moles of water required=$5\times 2=10$ moles