The reaction between hydrogen and iodine may be represented by the equation H2(g)+ I2(g) → 2HI(g), and is exothermic. Therefore
- an increase in temperature favours the forword reaction
- an increase in pressure favours the backward reaction
- both pressure and temperature muct be increased to favour the forward reaction
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a decrease in temperature will favour the forward reaction
- a decrease in pressure and an increase in temperature will favour the forward reaction