Chemistry

Problem

At 298\,K, the reaction

\mathrm{PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)}

has an equilibrium constant

K_c = 0.041

. In one experiment the equilibrium concentrations of

\mathrm{PCl_5}

and

\mathrm{PCl_3}

are found to be

0.255\,\text{M}

and

0.100\,\text{M}

, respectively. What is the equilibrium concentration of

\mathrm{Cl_2(g)}

? a)

0.041\,\text{M}

0.395\,\text{M}

0.105\,\text{M}

0.016\,\text{M}