# Thermodynamics - Gas Mixtures

1. Aug 4, 2009

### stephenzztan

A mixture of hydrocarbon gases is composed of 60% methane, 25% propane, and 15%
butane by weight. This mixture is compressed from 100 kPa and 20ºC to 1000 kPa in a
reversible, isothermal, steady-flow compressor. Determine the work and heat transfer
for this compression per unit mass of the mixture.

2. Aug 5, 2009

### CFDFEAGURU

If you are asking for help obtaining a solution to this problem, you must show your attempt at a solution first.

3. Aug 5, 2009

### stephenzztan

hi there... i just cant figure out where to start... perhaps... should be using few of these equations : -

W in = q out + (h2 - h1)
Win = Q out
since it's isothermal, T1 = T2, change of KE and PE will be negligible
steady flow , mass flow rate will be constant

i just.. blurred.... i hope there's enlightment.... i need to submit this on coming friday.

thank you

4. Aug 6, 2009

### Redbelly98

Staff Emeritus
I would calculate Win here.

For that, you'd need to figure out how pressure varies with the volume of a unit mass -- say 1 kg -- along the path described.