Question

In the reaction, ${\mathrm{P}}_4+\mathrm{NaOH}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{PH}}_3+{\mathrm{NaH}}_2{\mathrm{PO}}_2$ the mole ratio of ${\mathrm{NaH}}_2{\mathrm{PO}}_2$ and ${\mathrm{PH}}_3$ is :

Answer 1

Mole ratio:-

1. It is actually the ratio between the amounts in moles of the any two compounds involved in chemical reaction.
2. The reaction must be balanced.
3. It provides the comparison of the ratios of the molecules, which are mandatory for the completion in a chemical reaction.
4. So, the balanced reaction is:-

$\underset{\mathrm{Tetraphosphorus}}{{\mathrm{P}}_4}+\underset{\mathrm{Sodium}\mathrm{hydroxide}}{3\mathrm{NaOH}}+\underset{\mathrm{Water}}{3{\mathrm{H}}_2\mathrm{O}}\to \underset{\mathrm{Phisphine}}{{\mathrm{PH}}_3}+\underset{\mathrm{Sodium}\mathrm{hypophosphite}}{3{\mathrm{NaH}}_2{\mathrm{PO}}_2}$.

Therefore, the mole ratio of ${\mathrm{NaH}}_2{\mathrm{PO}}_2$ and ${\mathrm{PH}}_3$ is 3.