2SO2(g) + O2(g) 2SO3. In the reaction above, the standard heats of formation of SO2(g) and SO3(g) are -297 KJ mol-1 respectively. The heat change of the reaction is?
-
A.
-99 kJ mol– -
B.
-198 kJ mol– -
C.
+198 kJ mol– -
D.
+683kJ mol–
Correct Answer: Option B
Explanation
2SO2 + O2 → 2SO3
2(-297) 2(-396)
-594 -792
Heat change = heat of product – reactants = -792 – (-594) = 198kj mol–