Considering Constant-Composition Processes
A gas mixture in a piston–cylinder assembly consists of 2 lb of N2 and 3 lb of He. Determine
(a) the composition in terms of mass fractions.
(b) the composition in terms of mole fractions.
(c) the heat transfer, in Btu, required to increase the mixture temperature from 70 to 150°F, while keeping the pressure constant.
(d) the change in entropy of the mixture for the process of part (c), in Btu/°R.
For parts (c) and (d), use the ideal gas model with constant specific heats.
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