Q. 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
Explanation
(a)
$2NaHCO_{3}\overset{\mathrm{\Delta}}{\rightarrow}Na_{2}CO_{3} + H_{2}O + CO_{2}$
2 mol 1 mol
$\because$ 2 mole $NaHCO_{3}$ on decomposition gives= 1 moles $Na_{2}CO_{3}$
$\therefore$ 0.2 mole $NaHCO_{3}$ on decomposition will give
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{1}{2} \times 0.2$
=0.1 mol $Na_{2}CO_{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.