A girl places her hand in a bucket filled ice water at 0.0 C long enough foR 15.

Question

A girl places her hand in a bucket filled ice water at 0.0 C long enough foR 15.0 J of heat to transfer from her hand to the ice water. The time over which this takes place is sufficiently short that her hand remains at a constant temperature of 37.0 C. Compute the entropy changes for A. The hand B. The water C. The universe A girl places her hand in a bucket filled ice water at 0.0 C long enough foR 15.0 J of heat to transfer from her hand to the ice water. The time over which this takes place is sufficiently short that her hand remains at a constant temperature of 37.0 C. Compute the entropy changes for A. The hand B. The water C. The universe A. The hand B. The water C. The universe

Explanation / Answer

Entropy change of

a. hand=Q/Thand=-15.0/310=-0.0484 J/K

b. water=Q/Twater=15.0/273=0.0549 J/K

c. universe= entropy change of water+entropy change of hand

                =0.0549-0.0484=0.0065

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