Q28Short answer
The value of Kc for the reaction 2HI (g) H2 (g) + I2 (g) is 1 × 10 At a given time, the composition of reaction mixture is –5 –5 –5 [HI] = 2 × 10 mol, [H2] = 1 × 10 mol and [I2] = 1 × 10 mol In which direction will the reaction proceed? + –8
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At a given time the reaction quotient Q for the reaction will be given by the expression. [H 2 ][ I 2 ] Q= 2 [HI ] –5 –5 1 × 10 × 1 × 10 1 = –5 2 = (2 × 10 ) 4 –1 = 0.25 = 2.5 × 10 –4 As the value of reaction quotient is greater than the value of Kc i.e. 1× 10 the reaction will proceed in the reverse direction. –8 –3