# A 10 mg effervescent tablet contianing sodium

Question:

A $10 \mathrm{mg}$ effervescent tablet contianing sodium bicarbonate and oxalic acid releases $0.25 \mathrm{ml}$ of $\mathrm{CO}_{2}$ at $\mathrm{T}=298.15 \mathrm{~K}$ and $\mathrm{p}=1$ bar. If molar volume of $\mathrm{CO}_{2}$ is $25.0 \mathrm{~L}$ under such condition, what is the percentage of sodium bicarbonate in each tablet ? [Molar mass of $\mathrm{NaHCO}_{3}=84 \mathrm{~g} \mathrm{~mol}^{-1}$ ]

1. $16.8$

2. $8.4$

3. $0.84$

4. $33.6$

Correct Option: 1

Solution:

$16.8$