I need help on my chem hw!

The standard enthalpy change for the following reaction is 82.1 kJ at 298 K. N2(g) + 1/2 02(g) N2O($) AH = 82.1 kJ What is the standard enthalpy change for the reaction at 298 K? 2 N20(g) > 2 N2(g) + O2(g) KJ The standard enthalpy change for the following reaction is -433 kJ at 298 K. K(s) + 1/2 Cl2(g) + 2 02(g) KCIO4(s) AH = -433 kJ What is the standard enthalpy change for the reaction at 298 K? KCIO4(s) K(s) + 1/2 C12(g) + 2 O2(g) KJ