For the reaction aA (aq) + bB(l) cC(g) + dD(aq) the equilibrium constant, K, can

Question

For the reaction aA (aq) + bB(l) cC(g) + dD(aq) the equilibrium constant, K, can be written as follows. K = P_C^c middot [D]^d/[A]^a The equilibrium constant is unitless because each quantity is a dimensionless ratio of the actual concentration or pressure divided by standard state concentration or pressure. pressure and concentration are unitless quantities. taking each pressure or concentration to its coefficient power cancels out the units. the units always mathematically cancel when the pressure is expressed in torr and concentration is expressed in molality.

Explanation / Answer

The equilibrium constant is calculated using activities of reactants and products.

activity = actual concentration or pressure / standard state concentration or pressure

So, actvity is unitless.

Therefore,

  equilibrium constant is unitless.

Ans = 1st option

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