Question

For the reaction 2nocl(g)=2no+cl2 ∆H°=18kal and ∆s°=30cal/k at 300k find kp°at 300k​

Answer 1

Answer:

ΔHo=77.2kJ/mol×1000J/kJ=77200J/mol

Using the relation

ΔGo=ΔHo−TΔSo

ΔGo=77200J/mol−(298K×122J/mol/K)

ΔGo=40844Jmol−1

Let the equilibrium constant be Kc, we know that

ΔGo=−2.303RTlogKco

or logKco=−2.303RTΔGo

logKco=−2.303×8.314J/mol/K×298K40844J/mol=−7.158

Kco=6.95×10−8

Hope it helps :)