7. Consider a constant-volume battery that can operate reversibly. For this syst

Question

7. Consider a constant-volume battery that can operate reversibly. For this system, the work can be expressed (in derivative form) as where is voltage and Q is charge. Which expression below gives a correct expression for dU at constant volume? d. dU =-pdV-SdT 8. In the expansion of an ideal gas from 12.0 L and 298 K to 34.0 L at 355 K, the entropy change can be calculated from which expression? a. nRIn/12.01 b. nR In(34.0L c. nRIn(12.0L 34.0L+nC In(355K 12.0L+nC, In(355K 34.0L-nC, In/298K 12.o+nkIn(8s5K 298K 298K 355K 298K 4.0L 9. A reaction will occur spontaneously at constant T and p if-s less than 0. d. AG

Explanation / Answer

7. Option A, from I st law of thermodynamics dQ= dU+PdV

8. Option B, is correct

9. Option D, delta G< 0

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