For the gas phase reaction
`C_(2)H_(4)+H_(2) hArr C_(2)H_(6)(DeltaH=-32.7 "kcal")`
carried out in a vessel, the equilibrium concentration of `C_(2)H_(4)` can be increased by

Options

A. Increasing the temperature
B. increasing concentration of `H_(2)`
C. decreasing temperature
D. increasing pressure

Answer

A

Explanation

`C_(2)H_(4) + H_(2)hArrC_(2)H_(6)` , `Delta H = - 32.7` kcal
`Delta n = P_("mole") - R_("mole") = 1 - 2 = - 1`
`Delta H = -ve` exothermic reaction `darr` `x prop (1)/(T) uarr`
Temperature increase reaction goes toward reactant. Thus, concentration of `C_(2)H_(4)` increase.