What is the mass of potassium chloride produced when $12.25 \mathrm{~g}$ potassium chlorate undergo…

What is the mass of potassium chloride produced when $12.25 \mathrm{~g}$ potassium chlorate undergo decomposition? (At mass: $\mathrm{K}=39$, $\mathrm{Cl}=35.5, \mathrm{O}=16)$
  1. $16.0 \mathrm{~g}$
  2. $14.9 \mathrm{~g}$
  3. $7.45 \mathrm{~g}$
  4. $4.25 \mathrm{~g}$

Solution

$\begin{aligned} & \mathrm{KClO}_3 \longrightarrow \mathrm{KCl}+\frac{3}{2} \mathrm{O}_2 \\ & \mathrm{Mole} \text { of } \mathrm{KClO}_3=\text { moles of } \mathrm{KCl} \\ & \text { reacted } \quad \quad \text { produced } \\ & \frac{12.25}{122.5}=\frac{\mathrm{W}}{74.5} \\ & \mathrm{~W}=7.45 \mathrm{~g}\left(\begin{array}{l}\mathrm{M} . \mathrm{M} \text { of } \mathrm{KCl}=74.5 \\ \text { M.M.of } \mathrm{KClO}_3=122.5\end{array}\right)\end{aligned}$

Asked in: MHT CET 2021 (22 Sep Shift 1)

Practice more Some Basic Concepts of Chemistry questions on Aicharya