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L28_Energy_Balances_Reactive_System-1

# L28_Energy_Balances_Reactive_System-1 - Material and Energy...

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CAB1064 – Material and Energy Balances 1 Material and Energy Balances 10/12/11 Energy Balances on Reactive Systems

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CAB1064 – Material and Energy Balances 2 Material and Energy Balances 10/12/11 Objectives At the end of this chapter, you should be able to understand the following : Measurement of heat of reaction Hess’s law Standard heats of formation Heats of reaction from heats of formation data
CAB1064 – Material and Energy Balances 3 Material and Energy Balances 10/12/11 MEASUREMENT OF HEAT OF REACTION A heat of reaction may be measured in a calorimeter – a closed reactor immersed in a fluid contained in a well-insulated vessel. The rise or fall of the fluid temperature can be measured and used to determine the energy released or absorbed by the reaction, and the value of may then be calculated from that energy and known reactant and product heat capacities

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CAB1064 – Material and Energy Balances 4 Material and Energy Balances 10/12/11 MEASUREMENT OF HEATS OF REACTION Suppose we wish to determine ° r H ˆ for the reaction ) CO(g (g) O C(s) 2 2 1 + It is impossible to determine the heat of the CO formation reaction alone However, you can carry out the reactions 1. kJ/mol 51 . 393 : CO O C r1 2 2 - = + ° H 2. kJ/mol 99 . 282 : CO O CO r2 2 2 2 1 - = + ° H and determine their heats of reaction experimentally.
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L28_Energy_Balances_Reactive_System-1 - Material and Energy...

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