For the reaction A_((g))+B_((g)) harr C_((g))+D_((g)) K is 0.63 at 700^(@)C and 1.66 at 1000^(@)C. Then DeltaH^(@) is x KCal. What is x?

For the reaction A_((g))+B_((g)) harr C_((g))+D_((g)) K is 0.63 at 700

1.	For the reaction A_((g))+B_((g)) harr C_((g))+D_((g)) K is 0.63 at 700^(@)C and 1.66 at 1000^(@)C. Then DeltaH^(@) is x KCal. What is x?
Answer» SOLUTION :`LOG(K_(2))/(K_(1))=(DeltaH^(@))/(2.303R)[(1)/(T_(1))-(1)/(T_(2))]` `log((1.66)/(0.63))=(DeltaH^(@))/(2.303R)[(1)/(973)-(1)/(1273)]` `DeltaH^(@)=8000` cal= 8 kcal