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Which of the following reactions is endothermic ? a) 2 CO(g) + O2(g) -> 2 CO2(g) ΔH = - 566 kJ*mol-1b) H2(g) + 1/2 O2(g) - 285.5 kJ -> H2O(l) c) PCl3(g) + Cl2(g) -> PCl5(g) + 88kJ d) CO2(g) + H2(g) + 39.1 kJ -> CO(g) + H2O(g)
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