Question

Sodium bicarbonate on heating decomposes to form sodium carbonate, ${CO}_2$ and water. If $0.2$ moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?

• A. $0.1$
• B. $0.2$
• C. $0.05$
• D. $0.025$

Answer 1

The correct option is A $0.1$

$2NaH{CO}_3\underset{}{\overset{\Delta }{\to }}{Na}_2{CO}_3+H_{2}O+C{O}_2$
$2$ mol $NaH{CO}_3$ on decomposition gives
$=1mol$ ${Na}_2{CO}_3$
$\therefore$ $0.2mol$ $NaH{CO}_3$ on decomposition will give
$=\frac{1}{2}\times 0.2=0.1mol{Na}_2{CO}_3$