Discussion
Match each kind of enthalpy change with what causes it.
List I
A. Sensible heat
B. Latent heat
C. Heat of reaction
D. Heat of mixing
List II
1. a chemical change at fixed temperature
2. a change of temperature within one phase
3. combining two substances into a solution
4. a change of phase at constant temperature
Answer: D
Any real enthalpy change is a sum of these contributions along a chosen path. Splitting a problem into such steps is exactly how a hypothetical path is constructed for calculation. Each step draws on a different kind of tabulated data.
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