Hess's Law
8. Thermochemistry / Hess's Law / Problem 5
The reaction of P4(g) and chlorine gas to form PCl5(g) has a ΔH = –433.8 kJ/mol. On the other hand, the reaction of PCl3(g) and chlorine gas to form PCl5(g) has a ΔH = –87.9 kJ/mol. In these conditions, what is the enthalpy of the formation of PCl3(g)?
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