Question

What is the change in enthalpy when 4.00 mol of sulfer trixoide decomposes to sulfer dioxide and oxygen gas?
2SO2 + O2 ---> 2SO3
delta H = 198kJ
The reaction as written gives dela H = 198 kJ for 2 mols SO2 to 2 mols SO3. You want the reverse reaction so that will be -198 kJ for 2 mols SO3 to 2 mols SO2. So wouldn't 4 mols SO3 to 4 mols SO2 be twice that?

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