Chemistry

Problem

A mixture of phosphorus(III) chloride, phosphorus(V) chloride and chlorine in a sealed flask with a total volume of

2 \text{ dm}^3

was analysed and found to contain 1.2 mol of

\text{PCl}_3

, 2.5 mol of

\text{PCl}_5

and 0.2 mol of

\text{Cl}_2

. The equation for the reaction is as follows:

\text{PCl}_3(\text{g}) + \text{Cl}_2(\text{g}) \rightleftharpoons \text{PCl}_5(\text{g})