Problem: Consider the two diagrams below.Equation from Part A: ΔHA = ΔHB + ΔHCEquation from Part B: ΔHZ = ΔHX + ΔHYThe 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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The equations show the relationships between the individual enthalpies of each reaction as the sum of an  overall reaction equation.  

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Problem Details

Consider the two diagrams below.
(i) A is the increase in enthalpy from an initial low state to a high state in one step. B is an increase from the initial low state to an intermediate state, followed by C, which increases from that intermediate state to the final high state. (ii) X is the increase in enthalpy from an initial low state to a high state in one step. Y is a decrease in enthalpy from that high state to an intermediate state; Z is an increase from the initial state to that same intermediate state.


  • Equation from Part A: ΔHA = ΔHB + ΔHC
  • Equation from Part B: ΔHZ = ΔHX + ΔHY


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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