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For a reaction \mathrm{2 A+B \rightleftharpoons C} , the unit of equilibrium constant is 

Option: 1

\mathrm{mol^2\ dm^{-6}} 


Option: 2

\mathrm{mol\ dm^{-3}}


Option: 3

\mathrm{mol^{-2} dm^{6}}


Option: 4

\mathrm{mol^{-1} dm^{3}}


Answers (1)

best_answer

As we have learned

Units of equilibrium constant -

The value of equilibrium constant  Kc can be calculated by substituting the concentration terms in mol / L and for Kp partial pressure is substituted in Pa, KPa, bar or atm.

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 \mathrm{K_c = \frac{[ C]}{[A]^2[B]} = \frac{mol \: dm^{-3}}{(mol\: dm^{-3})^2(mol\ dm^{-3})} = mol ^{-2}\ dm^{6}} 

Hence, the correct answer is Option (3)

Posted by

Kuldeep Maurya

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