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Entropy of an ideal gas

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1) One mole of an ideal gas is changed from 273.15K and 2 atm to 233.15K and 0.4 atm. Calculate delta S for this change in state.

2) Arrange the following chemicals in order of increasing entropy at STP.
n - pentane (g)
methanol ( l)
ethanol (l)
ethanol (g)

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Solution Summary

The entropy equation for an ideal gas is given along with an ordering entropy problem.

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1. dS = Cpln(T2/T1) - Rln(P2/P1)

We don't know what Cp is, it depends on the type of ideal gas. T2 ...

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