Question

When 20 g of $NaHC{O}_3$ is heated, 12.62 g of $N{a}_{2}C{O}_3$ and 5.24 g of $C{O}_2$ are produced. How many grams of $H_{2}O$ will be produced?

• A. 1.14 g
• B. 2.14 g
• C. 2.5 g
• D. 3.0 g

Answer 1

The correct option is B 2.14 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 of $NaHC{O}_3$ heated = 20 g
Total mass $N{a}_{2}C{O}_3$ produced = 12.62 g
Total mass of $C{O}_2$ produced = 5.24 g
$\therefore$ Mass of $H_{2}O$ produced$=20-12.62-5.24=2.14$ g