The equations show the relationships between the individual enthalpies of each reaction as the sum of an overall reaction equation.

Consider the two diagrams below.

- Equation from Part A: ΔH
_{A}= ΔH_{B}+ ΔH_{C} - Equation from Part B: ΔH
_{Z}= ΔH_{X}+ ΔH_{Y}

The equations you obtained in parts (a) and (b) are based on what law?

a) Hess's Law

b) Charles' Law

c) Conservation of mass

d) Boyle's Law

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