Question

Water produces hydrogen and oxygen in the ratio of (mole ratio):

• A. $1:1$
• B. $2:3$
• C. $2:1$
• D. $1:2$

Answer 1

Answer: (C)

$2:1$

We can see from the balanced equation, that the mole ratio of hydrogen to oxygen is 2:1 , both in the water molecule and in the reactants, hydrogen gas $\left(H_2\right)$ and oxygen gas $\left(O_2\right)$. The electrolysis of water causes the decomposition of water, $\left(H_{2}O\right)$, which produces hydrogen and oxygen.