Question

$10\text{g}$ of $CaC{O}_3$ is completely decomposed to $X$ and $CaO$. $X$ is passed into an aqueous solution containing one mole of sodium carbonate. What is the number of moles of sodium bicarbonate formed?

• A. $0.2$
• B. $0.1$
• C. $0.01$
• D. $10$

Answer 1

The correct option is A $0.2$

$CaC{O}_3\stackrel{A}{\to }CaO+C{O}_2\left(X\right)$
So, $X$ is $C{O}_2$
$N{a}_{2}C{O}_3+H_{2}O+C{O}_2\to 2NaHC{O}_3$
Moles of $CaC{O}_3=\frac{10}{100}=0.1\text{moles of}C{O}_2$
Mole of $N{a}_{2}C{O}_3=1\text{mole}$
So, moles of $NaHC{O}_3$ formed according to the moles of $C{O}_2$, which is limiting reagent so moles of $NaHC{O}_3$ formed will be $0.2\text{mole}$