Which equilibrium constant expression(s) are for the following reaction. (X stan

Question

Which equilibrium constant expression(s) are for the following reaction. (X stands for the mole fraction of the indicated substance in its phase, which we have so far assumed equal to unity (one) for essentially pure phases.)

NH3(g) + H3O+(aq) NH4+(aq) + H2O(l)
Choose from the list below and enter the letters alphabetical order. (e.g. AH)

A) (pNH3)eq              I) (pNH3)eq3
B) [H3O+]eq            J) [H3O+]eq3
C) [NH4+]eq            K) [NH4+]eq4
D) (XH2O)eq           L) (XH2O)eq2
E) (pNH3)eq-1        M) (pNH3)eq-3
F) [H3O+]eq-1         N) [H3O+]eq-3
G) [NH4+]eq-1       O) [NH4+]eq-4
H) (XH2O)eq-1        P) (XH2O)eq-2

Explanation / Answer

NH3(g) + H3O+(aq) NH4+(aq) + H2O(l)

For this equation, equilibrium constant is give by the following expression=[NH4+]/pNH3[H3O+]

So the possible expression is CDEF

that is [NH4+]eq(XH2O)eq(pNH3)eq-1[H3O+]eq-1

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