Classify each of the following as exothermic or endothermic and give the ΔH for each:
a. How many kilojoules are released when 125 g of Cl2 reacts with silicon?
Si(s) + 2Cl2(g) → SiCl4(g) ΔH = 657kJ
b. How many kilojoules are absorbed when 278 g of PCl5 reacts?
PCl5(g) → PCl3(g) + Cl2(g) ΔH = + 67 kJ
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