Interpret these equations in terms of the relative number of moles of each substance involved and indicate whether the reaction is exothermic or endothermic: (a) 2 Na + Cl2 ——>2 NaCl + 822 kJ (b) PCl5 + 92.9 kJ ——> PCl3 + Cl2 (c) S(s) + 2 CO(g) ——> SO2(g) + 2 C(s) + 76 kJ
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