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Thermochemistry Assignment April 2017 1. Calculate the change in enthalpy for the following reaction using bond energies. C 2 H 4 (g) + 3 O 2 (g) → 2CO 2(g) + 2 H 2 O (l) ∆H = ??? 2. Calculate the change in enthalpy for the following reaction using formation energies. 2C 6 H 14 (g) + 19O 2(g) →12CO 2 (g) + 14H 2 O (g) ∆H= ??? 3. Use Hess’s Law to determine the change in enthalpy for the following reaction. 2N 2 (g) + 5O 2 (g) → 2N 2 O 5 (g) ∆H= ??? (1) H 2(g) + 1/2O 2(g) → H 2 O (l) ∆H= -285.8 kJ (2) N 2 O 5(g) + H 2 O (l) → 2HNO 3(l) ∆H= -76.6 kJ (3) 1/2N 2 (g) + 3/2O 2(g) + ½ H 2(g) → HNO 3 (l) ∆H= - 174.1 kJ
Transcript of file · Web viewThermochemistry Assignment . April 2017. 1. Calculate the change in...
Thermochemistry Assignment
April 2017
1. Calculate the change in enthalpy for the following reaction using bond energies.
C2H4 (g) + 3 O2 (g) → 2CO2(g) + 2 H2O(l) ∆H = ???
2. Calculate the change in enthalpy for the following reaction using formation energies.
2C6H14 (g) + 19O2(g) →12CO2 (g) + 14H2O (g) ∆H= ???
3. Use Hess’s Law to determine the change in enthalpy for the following reaction.
2N2 (g) + 5O2 (g) → 2N2O5 (g) ∆H= ???
(1) H2(g) + 1/2O2(g) → H2O(l) ∆H= -285.8 kJ
(2) N2O5(g) + H2O(l) → 2HNO3(l) ∆H= -76.6 kJ
(3) 1/2N2 (g) + 3/2O2(g) + ½ H2(g) → HNO3 (l) ∆H= -174.1 kJ
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