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We cannot always rely on tabulated data to provide the heat of vaporisation at the temperature we are operating at and we need to use
We cannot always rely on tabulated data to provide the heat of vaporisation at the temperature we
are operating at and we need to use correlations and rules.
a Estimate the heat of vaporisation of acetic acid at its normal boiling point using Troutons
Rule
b Do the same estimation using Chens Rule.
c What is the error of the estimations from part a and b compared to the tabulated value for
acetic acid?
d Estimate the heat of vaporisation of acetic acid at deg C using Watsons correlation.
ANSWER THESE BY FOLLOWING THE PROCESS BELOW:
Draw a picture of your system and define boundary
Label streams in and out including Work and heat
Determine what the variable of interest is
Heat, work, mass flow rate?
Write the balance and ignore terms that are not relevant
Mechanical balances heat and enthalpy not relevant
Thermal processes Ek Ep and W not relevant
Calculate each relevant term
Create a table to keep track of enthalpy values
Use equations or resources as discussed in these slides
Solve for variable of interest
SHOW FULL WORKING AND INCLUDE UNIT ANALYSIS
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