Equilibrium Constant and Standard Free Energy Change
The Δ H f ∘ f...
Question
The ΔH∘f for CO2(g), CO(g) and H2O(g) are –393.5, –110.5 and –241.8 kJ mol–1 respectively. The standard enthalpy change (in kJ) for the reaction CO2+H2→CO+H2O is:
A
524.1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
41.2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
-262.5
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
-41.2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is B 41.2 ΔrH∘=ΔfH∘(CO)+ΔfH∘(H2O)−ΔfH∘(H2) =-110.5-241.8+393.5-0 =41.2