Question

NaOH is formed according to the reaction
$2Na+\frac{1}{2}{O}_2\to N{a}_{2}O$
$N{a}_{2}O+H_{2}O\to 2NaOH$
To make 4g of $NaOH$, $Na$ is required:

• A. 4.6 g
• B. 4.0 g
• C. 2.3 g
• D. 0.23 g

Answer 1

The correct option is C 2.3 g

According to the balanced chemical equation,

In order to form $2\times 40=80g$ $NaOH$, $Na$ required $=2\times 23=46g$

Therefore, in order to form $4g$ $NaOH$, $Na$ required $=\frac{46}{80}\times 4=2.3g$

Hence, option $C$ is the correct answer