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Question:

For the gas phase reaction,C2H4+H2⇌C2H6;[△H=−32.7 kcal]Carried out in a vessel, the equilibrium concentration ofC2H4can be increased by:increasing the pressureincreasing the temperatureadding someH2removing someC2H6For the gas phase reaction,C2H4+H2⇌C2H6;[△H=−32.7 kcal]Carried out in a vessel, the equilibrium concentration ofC2H4can be increased by:increasing the pressureincreasing the temperatureadding someH2removing someC2H6C2H4+H2⇌C2H6;[△H=−32.7 kcal]C2H4+H2⇌C2H6;[△H=−32.7 kcal]C2H4+H2⇌C2H6;[△H=−32.7 kcal]C2CCC22222H4HHH44444++H2HHH22222⇌⇌C2CCC22222H6HHH66666;;[[△△HH==−−32.732.7 kkccaall]]C2H4C2H4C2H4C2CCC22222H4HHH44444increasing the pressureincreasing the temperatureadding someH2H2H2H2H2HHH22222removing someC2H6C2H6C2H6C2H6C2CCC22222H6HHH66666Aincreasing the temperatureincreasing the temperatureBadding someH2adding someH2H2H2H2H2HHH22222Cincreasing the pressureincreasing the pressureDremoving someC2H6removing someC2H6C2H6C2H6C2H6C2CCC22222H6HHH66666?

increasing the temperature

adding someH2

increasing the pressure

removing someC2H6

Solution:

SinceΔH<0, it is an exothermic reaction and according to le Chatelier's principle in an exothermic reaction increase in temperature favours backward reaction which will increase the concentration ofC2H4