CHEM101 Lecture Notes - Lecture 11: Calorimetry
25 May 2018
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Chem101- Lecture 11- Bomb Calorimetry
Bomb Calorimetry
• “Bomb” Calorimetry- means constant volume, used to study combustion
o Reaction with N and
▪ q reactions = -q calorimeter
▪ calorimeter= bomb + water
o First, calibrate calorimeter to determine C cal, then:
▪
•
Example
A serving of grape nuts cereal (5.80g) is burned in a bomb calorimeter with a heat capacity of
. During combustion, the temperature of water is increased by 1.92 caloric energy
content
• Hess’s Law- enthalpy is a state function, the change in enthalpy that occurs when
reactants are converted to products in a reaction is the same whether the reaction
occurs in one step or a series of steps
1. Identify reactants and products you wish to find the for
2. Write equations so that correct species are on the right or left of the arrow
a. If “flipped” change the sign
3. Multiply equation by the appropriate #
a. Multiply by that number
