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OpenStudy (naturesweetie):
Help please! Question 21. By using the following reactions, calculate the heat of combustion of pentane: C5H12 (g) + 8O2 (g) ----- 5CO2 (g) + 6H2O (l). C (s) + O2 (g)---- CO2 (g), dH = 395 kJ H2 (g) + 1/2O2 (g)---- H2O (l), dH = 285 kJ 5C (s) + 6H2 (g)----- C5H12 (g), dH = 147 kJ (Points : 3) -6.80 × 103 kJ -5.42 × 103 kJ - 4.16 × 103 kJ -3.54 × 103 kJ
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