Visualizing Concepts

Consider the two diagrams that follow. (a) Based on (i), write an equation showing how ΔHA is related to ΔHB and ΔHC. How do both diagram (i) and your equation relate to the fact that enthalpy is a state function? (b) Based on (ii), write an equation relating ΔHZ to the other enthalpy changes in the diagram. (c) How do these diagrams relate to Hess’s law? [Section]