Question

Use the following calorimetric data to calculate the heat of combustion (burning) of the carbon compound...

Use the following calorimetric data to calculate the heat of combustion (burning) of the carbon compound shown below:

C3H8 (g) + 5O2 (g) → 3CO2(g) + 4H2O(g)

reaction ΔHo (kJ)
C(s) + O2(g) → CO2(g) -393.5
C(s) → C(g) +718.4
H2O(l) → H2O(g) +44.0
H2(g) + 1/2 O2(g) → H2O(l) -285.8
3C(s) + 4H2(g) → C3H8(g) -103.8
C(s) + 2H2(g) + 1/2O2(g) → CH3OH(l) -238.7
6C(s) + 3H2(g) → C6H6(g) +82.9
C6H6(l) → C6H6(g) +33.9
CH3OH(l) → CH3OH(g) +38.0

ΔHo = kJ

Thanks in advance!
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Homework Answers

Answer #1

C3H8(g) → 3C(s) + 4H2(g)   ΔHo = +103.8

3C(s) + 3O2(g) → 3CO2(g)   ΔHo = -1180.5

4H2(g) + 2 O2(g) → 4H2O(l)     ΔHo = -1143.2

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                                  total ΔHo = 2219.9 KJ

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