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What is the enthalpy of formation for the substances

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What is the enthalpy of formation for the substances, given the thermochemical reactions? Assign whether the process is endothermic or exothermic.

a.) Determine ΔH?f for magnesium nitride.

3Mg (s) + 2NH3 (g) → Mg3N2 (s) +3H2 (g) ΔH? = -371 kJ

1/2 N2 (g) + 3/2 H2 (g) → NH3 (g) ΔH? = -46 kJ

b.) Determine ΔH?f for dinitrogen pentoxide.

2H2 (g) + O2 (g) → 2H2O (l) ΔH? = -571.5 kJ

N2O5 (g) + H2O (l) → 2HNO3 (l) ΔH? = -76.6 kJ

1/2 N2 (g) + 3/2 O2 (g) +1/2 H2 (g) → HNO3 (l) ΔH? = -174 kJ

c.) Determine ΔH?f for copper (II) oxide.

2Cu (s) + S (s) → Cu2S (s) ΔH? = -79.5 kJ

S (s) + O2 (g) → SO2 (g) ΔH? = -297 kJ

Cu2S (s) + 2O2 (g) → 2CuO (s) + SO2 (g) ΔH? = -527.5 kJ

d.) Determine ΔH?f for magnesium nitrate.

8Mg (s) + Mg(NO3)2 → Mg3N2 (s) + 6MgO (s) ΔH? = 3884 kJ

Mg3N2 (s) → 3Mg (s) + N2 (g) ΔH? = 463 kJ

2MgO (s) → 2Mg (s) + O2 (g) ΔH? = 1203 kJ

Reference no: EM131940769

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