Percentage loss in mass, when $\mathrm{N}\mathrm{a}\mathrm{H}\mathrm{C}{\mathrm{O}}_3\left(\mathrm{s}\right)$ is heated in open vessel
$\text{2}{\text{NaHCO}}_{\text{3}}\text{(s)}\to {\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}\left(\text{s}\right)+{\text{CO}}_{\text{2}}\left(\text{g}\right)+{\text{H}}_{\text{2}}\text{O}\left(\text{g}\right)$

• A

  21.12%
• Correct answer
  B

  36.9%
• C

  30%
• D

  32.23%

Hence, the correct answer is option: 'B'.