methane, ch4, reacts with i2 according to the reaction ch4(g)+i2(g)⇌ch3i(g)+hi(g) at 630 k, kp for this reaction is 2.26×10−4. a reaction was set up at 630 k with initial partial pressures of methane of 105.1 torr and of 7.96 torr for i2.