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For an ideal gas with constant properties undergoing a quasi-static process, which one of the following represents the change of entropy (∆s) from state 1 to 2?
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ds = cpln T2 - R ln P2 T1 P1 -
ds = cpln T2 - R ln P2 T2 P2 -
ds = cpln T1 - R ln P2 T2 P1 -
ds = cpln T2 + R ln P2 T1 P1
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Correct Option: A
| ∆ S = Cpln | - R ln | T1 | P1 |
Tds = dh – vdp
= Cp dt – vdp
| ds = | - | dp | T | P |
| ds = | - R ln | T | P1 |
