. The compound PCIsd) can be burned in Cla to give PCIs. A total 46.5 kJ of energy is liberated in the process when 0.500 mole of PClacy) is burned. What is AH, of PCs? AH, of PCI36) = -306 kJ/mol
I'm sorry but I have no idea what sd, a, acy stand for; therefore, I don't know the identity of PClsd, Cla, or PClacy or PCl36. The simple answer to your question is to write out the equation, then
delta H^o reaction = (n*dH^o products) - (n*dH^o reactants) where delta H^o reaction will be -46.5 kJ. Plug in the other numbers from the table of delta H^o values and solve for dH^o of PCs. n = number of moles in the equation I wrote.