Question

When $10g$ of $KHC{O}_3$ is heated, $6.31g$ of $K_{2}C{O}_3$ and $1.07g$ of $H_{2}O$ are produced. How many grams of $C{O}_2$ will be produced?

• A. $2.14g$
• B. $1.07g$
• C. $2.62g$
• D. $1.14g$

Answer 1

The correct option is C $2.62g$

Applying the law of conservation of mass,
total mass of the reactants is equal to the total mass of the products.
Mass of $KHC{O}_3$ = mass of $K_{2}C{O}_3$ + mass of $C{O}_2$ + mass of $H_{2}O$
Total mass of $KHC{O}_3$ heated = $10g$
Total mass $K_{2}C{O}_3$ produced = $6.31g$
Total mass of $H_{2}O$ produced = $1.07g$
$\therefore$ Mass of $C{O}_2$ produced$=(10-6.31-1.07)=2.62$ g