Using your knowledge of Hess’s Law, determine the enthalpy change for each reaction shown below. Remember, to find the enthalpy change you must first find the enthalpy of the intermediate reactions. If a reaction does not match it must be reversed according the Hess’s Law.
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Reaction |
Enthalpy |
---|---|
N2 (g) + O2 (g) → 2NO (g) | ΔH= -180.5 kJ |
N2 (g) + 3 H2 (g) → 2NH3 | ΔH= -91.8.0 kJ |
2H2 (g) + O2 (g) → 2H2O (l) | ΔH= -483.6 kJ |
Use these values and Hess’s Law to determine the enthalpy change for the reaction:
Reaction |
Enthalpy |
---|---|
C2H4 (g) + 3 O2 (g) → 2CO2 (g) + 2 H2O (l) | ΔH= -1411.0 kJ |
C2H6 (g) + 3 ½ O2 (g) → 2CO2 (g) + 3H2O (l) | ΔH= -1560.0 kJ |
C2H4 (g) + H2 (g) →C2H6 (g) | ΔH= -137.0 kJ |
Use these values and Hess’s Law to determine the enthalpy change for the reaction:
Reaction |
Enthalpy |
---|---|
C2H5OH (l) + 2O2 (g) → 2 CO2 (g) + 2H2O (l) | ΔH= -875.0 kJ |
C (s) + O2 (g) → CO2 (g) | ΔH= -394.51.0 kJ |
H2 (g) + ½O2 (g) → H2O (l) | ΔH= -137.0 kJ |
Use these values and Hess’s Law to determine the enthalpy change for the reaction:
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