Chemistry

Problem

In a 1.50 L vessel at 450 °C, the initial concentrations of

\mathrm{H_2(g)}

and

\mathrm{I_2(g)}

are each

0.400\,\text{M}

, and no

\mathrm{HI(g)}

is present. When equilibrium is re-established, the measured concentration of

\mathrm{HI}

0.560\,\text{M}

with an experimental uncertainty of

\pm 0.020\,\text{M}

. Which of the following is the best reported value of

K_{c}

for the reaction

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

at this temperature? a) 39 b) 11 c) 22 d) 2.0