Tetraphosphorus trisulfide, P4S3, burns in excess oxygen to give tetraphosphorus decoxide, P4O10, and sulfur dioxide, SO2. Suppose

Question:

Tetraphosphorus trisulfide, P4S3, burns in excess oxygen to give tetraphosphorus decoxide, P4O10, and sulfur dioxide, SO2. Suppose you have measured the enthalpy change for this reaction. How could you use it to obtain the enthalpy of formation of P4S3? What other data do you need?