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 Trouton$$s

Rule

b$)$ Do the same estimation using Chen$$s 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 $90\backslash$deg C using Watson$$s correlation.

ANSWER THESE BY FOLLOWING THE PROCESS BELOW:

$1.$ Draw a picture of your system and define boundary

$2.$ Label streams in and out $($including Work and heat$)$

$3.$ Determine what the variable of interest is$?$

$1.$ Heat, work, mass flow rate?

$4.$ Write the balance and ignore terms that are not relevant

$1.$ Mechanical balances $($heat and enthalpy not relevant$)$

$2.$ Thermal processes $($Ek Ep and W not relevant$)$

$5.$ Calculate each relevant term

$1.$ Create a table to keep track of enthalpy values

$2.$ Use equations $($or resources$)$ as discussed in these slides

$6.$ Solve for variable of interest

$($SHOW FULL WORKING AND INCLUDE UNIT ANALYSIS$)$