ThermodynamicsEasy
Question
During the melting of a slab of ice at 273 K at atomospheric pressure
Options
A.positive work is done by the ice-water system on the atmosphere
B.positive work is done on the ice water system by the atomsphere
C.the internal energy of the ice-water increases
D.the internal energy of the ice-water system decrease
Solution
There is a decrease in volume during melting on an ice slab at 273 K. Therefore, negative work is done by ice-water system on the atmosphere or positve work is done on the ice-water system by the atmosphere. Hence, option (b) is correct. Secondly heat is absorbed during melting (i.e., dQ is positive) and as well as we have seen, work done by ice-water system is negative (dW is negative). Therefore, from first law of thermodynamics
dU = dQ - dW
change in internal energy of ice-water system, will be positive or internal energy will increase.
dU = dQ - dW
change in internal energy of ice-water system, will be positive or internal energy will increase.
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