  Question

The equilibrium constant for the following reaction is 49 at 450oC. If 0.22 mol of I2, 0.22 mol of H2 and 0.66 mol of HI were put in a evacuated 1 litre container. H2+I2⇌2HI Then, the correct statement will be:

A
Reaction will proceed in forward direction until equilibrium is established.  B
Reaction will proceed in backward direction until equilibrium is established.  C  D
None of the above  Solution

The correct option is A  Reaction will proceed in forward direction until equilibrium is established.Given, nH2=0.22, nI2=0.2, nHI=0.66V=1L ∴[H2]=0.22,[I2]=0.22,[HI]=0.66 The concentration given in question are not necessarily the equilibrium concentrations. Calculating reaction quotient Qc from these concentrations : The reaction is H2+I2⇌2HI For this reaction, Qc=[HI]2[H2][I2] putting the value, Qc=(0.66)2(0.22)(0.22) Qc=9.0  but Kc=49 (Given), which is greater than Qc i.e. Kc>Qc Hence, the reaction will move in forward direction.Chemistry

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