Sec 10.2: “Using Enthalpy”
1. Molar enthalpy change: the change in ____________ for 1 ___________ of a pure
substance.
a. Symbol: ________________
b. Unit: __________________
c. When a pure substance is only ______________ or _____________, the amount
of heat involved is the same as the change in enthalpy, _________.
2. When a __________ substance is only heated or cooled, ΔH = ______ so…
(Molar enthalpy change) = (molar heat capacity) (temp. change)
a.
This reaction does _____ apply to __________ reactions or changes of ______.
3. Calculating Molar Enthalpy Change for Heating, Sample Problem B, pg 346
How much does the molar enthalpy change when ice warms from -5.4˚C to -0.2˚C?
4. Calculating Molar Enthalpy Change for Heating, Practice #1, pg. 346
Calculate the molar enthalpy change of H2O(l) when liquid water is heated from 41.7˚C to
76.2˚C.
5. Calculating the Molar Enthalpy Change for Cooling, Sample Problem C, pg. 347
Calculate the molar enthalpy change when an aluminum can that has a temperature of
19.2˚C is cooled to a temperature of 4.00˚C.
6. Calculating the Molar Enthalpy Change for Cooling, Practice #1, pg. 347
The molar heat capacity of Al(s) is 24.2 J/K∙mol. Calculate the molar enthalpy change
when Al(s) is cooled from 128.5˚C to 22.6˚C.
7. Positive ΔH = __________________ reaction
a. Negative ΔH = ___________________ reaction
8. Thermodynamics: the branch of science concerned with the ____________ changes
that accompany ________________ and _____________ changes.