Chemistry

Problem

The exothermic reaction 2 HI(g) ⇌

H_2(g)

I_2(g)

\Delta H^\circ < 0

is at equilibrium at

700\,\text{K}

. The temperature is then increased to

750\,\text{K}

while the volume remains constant. Which statement best describes the immediate effect on

Q

and

K

, and the resulting direction of the net shift? a)

K

decreases while

Q

remains unchanged; since

Q < K

, the system shifts toward HI. b)

K

decreases while

Q

increases; since

Q > K

, the system shifts toward

H_2

and

I_2

. c)

K

decreases while

Q

remains unchanged; since

Q > K

, the system shifts toward HI. d)

K

increases while

Q

remains unchanged; since

Q > K

, the system shifts toward HI.