Question

When $x$ g of $NaHC{O}_3$ is heated, 12.62 g of $N{a}_{2}C{O}_3$, 5.24 g of $C{O}_2$ and 2.14 g of $H_{2}O$ were produced. What is $x$?

• A. 20.00 g
• B. 15.00 g
• C.
  17.86 g
• D. 12.64 g

Answer 1

The correct option is A 20.00 g

Applying law of conservation of mass,
total mass of the reactants is equal to the total mass of the products.
Mass of $NaHC{O}_3$ = mass of $N{a}_{2}C{O}_3$ + mass of $C{O}_2$ + mass of $H_{2}O$

Total mass $N{a}_{2}C{O}_3$ produced = 12.62 g
Total mass of $C{O}_2$ produced = 5.24 g
$\text{Mass of}{H}_{2}O\text{produced}=2.14$ g
Total mass of $NaHC{O}_3$ heated $x=12.62+5.24+2.14=20$ g