Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?
Correct answer: A. dE = Tds - PdV
- A. dE = Tds - PdV
- B. dQ = CvdT + PdV
- C. dQ = CpdT + Vdp
- D. Tds = dE - PdV
Explanation
Combining the first and second laws for a closed, simple compressible system gives dE = Tds - PdV. The other expressions are special forms involving heat capacities and are not the general combined-law relation.
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