For the gas phase reaction: C 2 H 4 ( g ) + H 2 ( g ) ⇌ C 2 H 6 ( g ) Δ H = − 136.8 k J / m o l − 1 The reaction is carried out in a closed vessel. The equilibrium concentration of C 2 H 4 c

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For the gas phase reaction: C 2 ​ H 4 ​ ( g ) + H 2 ​ ( g ) ⇌ C 2 ​ H 6 ​ ( g ) Δ H = − 136.8 k J / m o l − 1 The reaction is carried out in a closed vessel. The equilibrium concentration of C 2 H 4 can be increased by

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For the reaction C 2 ​ H 4 ​ ( g ) + H 2 ​ ( g ) ⇌ C 2 ​ H 6 ​ ( g ) , Δ H = − 136.8 k J m o l − 1 the equilibrium concentration of C₂H₄ can be increased by: * Increasing temperature (the reaction is exothermic, so a higher temperature shifts the equilibrium backward). * Decreasing pressure (the number of moles of gas: left = 2, right = 1; low pressure favours the side with more moles of gas, which is the left side).

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