Question

The value of ΔH for the reaction, \[\ce{X2_{(g)} + 4Y2_{(g)} ⇌ 2XY4_{(g)}}\] is less than zero. Formation of \[\ce{XY4_{(g)}}\] will be favoured at ______.

Options

• high pressure and low temperature

• high temperature and high pressure

• low pressure and low temperature

• high temperature and low pressure

Answer 1

The value of ΔH for the reaction, \[\ce{X2_{(g)} + 4Y2_{(g)} ⇌ 2XY4_{(g)}}\] is less than zero. Formation of \[\ce{XY4_{(g)}}\] will be favoured at high pressure and low temperature.

Explanation:

The reaction (in forward direction) is beneficial at high pressure and low temperature according to Le-principle Chatelier's since Δn_g = negative and the reaction is exothermic in forward direction.