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# using enthalpy

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## Katelynn Dorn

on 17 April 2018

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#### Transcript of using enthalpy

Calculating Molar Enthalpy Change for Heating
How much does the molar enthalpy change when ice warms from -5.4 degrees C to -.2 degrees C?
T = Tf - Ti -> 5.2 K
(37.4 J/Kxmol)(5.2 K) = 190 J/mol
pg. 346 #1-2
Enthalpy of a System of Several Substances
Thermodynamics- examines various processes and the energy changes that accompany them
enthalpy equations reveal whether a reaction is endothermic or exothermic
equations can be written to show enthalpy changes in reactions
Calculating the Molar Enthalpy Change for Cooling
Calculate the molar enthalpy change when an aluminum can at 19.2 degrees C is cooled to a temp. of 4 degrees C.
H = (24.2)(-15) = -360 J/mol
pg. 347 #1-2
10.2 using enthalpy
Molar Enthalpy Change
H cannot be measured but H can
H = q
molar enthalpy change = C T
endothermic: +
exothermic: -
Wrap-Up Quiz
What is enthalpy and what is its symbol?
What is thermodynamics?
What equation do you use to calculate the molar enthalpy of a substance?
Name several processes in which equations can be written for enthalpy changes.
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