Use the given heats of formation to calculate the enthalpy change for this reaction.
B2O3 (s) + 3 COCl2 (g) → 2 BCl3 (g) + 3 CO2 (g)
a) 694.3 kJ
b) 354.9 kJ
c) -58.9 kJ
d) -3917.3 kJ
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