- #1
ruiwp13
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Homework Statement
Calculate the variation of ΔH in Btu for the following processes:
a) Heating of 7Ibmol of carbon dioxide from 77 to 1000ºF at 1atm using property tables for ideal gases.
b) Cooling of 22Ibmol of benzene from it's normal boiling point(80.1ºC) to 77ºF at 1atm.
c) Heating of 10tons of calcium carbonite from 70 to 1200ºF for which:
Cp/R=12.572+(2.637*10^-3)T - (3.120*10^5)T^-2 (T in K)
Homework Equations
ΔH=ΔU+ΔPV
h=u+pv
m=n*M
The Attempt at a Solution
a) and b) are very similar, so for a) I calculated the number of mols (1Ibmol=453.6mol) and I got 3175.2mol, then I got the M of carbon dioxide (44.01kg/kmol) and I multiplied it by 3,1752 obtaining 139.7405kg/kmol. I can get the mass trough m=n*M and on the table I have volume/kmol = 0.0943, but I don't know if I'm heading the right way because I need to know the volume @ 77ºF(25ºC) and @ 1000ºF(537ºC). And how do I find the ΔU in this case? Is it trough the Ibmol and the temperature difference?
in c) I can substitute the T for the temperature they gave me and I can find R. But I don't know after it what I need to do