Chemistry

Problem

The reaction

\mathrm{H_2(g)+I_2(g)\rightleftharpoons 2\,HI(g)}

has

K_c=50.0

at 450 °C. A reaction vessel initially at equilibrium contains

[\mathrm{H_2}]=0.500\,\text{M}

[\mathrm{I_2}]=0.500\,\text{M}

, and

[\mathrm{HI}]=3.536\,\text{M}

. An additional

1.00\,\text{mol}

\mathrm{HI}

is then injected into the

2.00\,\text{L}

vessel at the same temperature. After the system re-establishes equilibrium, what is the concentration of

\mathrm{H_2}

? a)

0.61\,\text{M}

0.50\,\text{M}

0.56\,\text{M}

0.45\,\text{M}