Question

4 mol of $PC{l}_5$ are heated at a constant temperature in the closed container.If degree of dissociation for $PC{l}_5$ is 0.5 then calculate total number of moles at equilibrium?

• A. 4.5
• B. 6
• C. 3
• D. 4

Answer 1

The correct option is A 4.5

${PCl}_5\rightleftharpoons {PCl}_3+{Cl}_2$

$4$ $-$ $-$

$4-0.5$ $0.5$ $0.5$

Total number of moles $=4-0.5+0.5+0.5$

$=4.5$