Initial conc. $1$ $3$ $0$
at equilibrium $1-0.81$ $3-2.43$ $1.62$
$0.19$ $0.57$
No. of moles of ${N_2} = \frac{{28}}{{28}} = 1$ $mole$
No. of moles of ${H_2} = \frac{6}{2} = 3$ $mole$
No. of moles of $N{H_3} = \frac{{27.54}}{{17}} = 1.62$ $mole$
${K_c} = \frac{{{{[N{H_3}]}^2}}}{{[{N_2}]\,\,{{[{H_2}]}^3}}} = \frac{{{{[1.62]}^2}}}{{[0.19]\,\,{{[0.57]}^3}}}$$=75$
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(Plank's const. $ h = 6. \times 10^{-34}\, Js\,;$ mass of electron $= 9.1091 \times 10^{-31}\, kg\,;$ charge of electron $e= 1.60210 \times 10^{-19}\, C\,;$ permittivity of vaccum $\in _0 = 8.854185 \times 10^{-12} \,kg^{-1} \,m^{-3} A^2$)