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C 3 H 8 (g) + 5 O 2 (g) 3CO 2 (g) + 4H 2 O (l) H = -2220kJ a . Endothermic because H < 0 and heat is absorbed by the system .
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For questions 1~4, consider the oxidation of propane:C3H8(g)+ 5 O2(g)→ 3CO2(g)+ 4H2O(l)∆H°= -2220kJa. Endothermic because ∆H° < 0 and heat is absorbed by the system.

b. Endothermic because ∆H° < 0 and heat is released by the system.c. Exothermic because ∆H° < 0 and heat is absorbed by the system.d. Exothermic because ∆H° < 0 and heat is released by the system.
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Subject: Chemistry, Science

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