Classify each of the following as exothermic or endothermic and give the ΔH for each:
a. C3H8(g) + 5O2(g)3CO2(g) + 4H2O(g) + 2220 kJ
b. 2Na(s) + Cl2(g) → 2NaCl(s) + 819 kJ
c. PCl5(g) + 67 kJ → PCl3(g) + Cl2(g)
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