Considering Constant-Composition ProcessesNatural gas
Chapter 12, Problem 26P(choose chapter or problem)
Natural gas having a molar analysis of 60% methane \(\left(\mathrm{CH}_{4}\right) \text { and } 40 \% \text { ethane }\left(\mathrm{C}_{2} \mathrm{H}_{6}\right)\) enters a compressor at 340 K, 6 bar and is compressed isothermally without internal irreversibilities to 20 bar. The compressor operates at steady state, and kinetic and potential energy effects are negligible.
(a) Assuming ideal gas behavior, determine for the compressor the work and heat transfer, each in kJ per kmol of mixture flowing.
(b) Compare with the values for work and heat transfer, respectively, determined assuming ideal solution behavior (Sec. 11.9.5). For the pure components at 340 K:
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