Question:
During the melting of a slab of ice at 273 K at atmospheric pressure:
During the melting of a slab of ice at 273 K at atmospheric pressure:
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Apply the first law of thermodynamics and consider the sign conventions for work and heat. Melting ice results in a decrease in volume, indicating work done on the system.
Updated On: Apr 24, 2025
- Internal energy of ice-water system remains unchanged.
- Positive work is done by the ice-water system on the atmosphere.
- Internal energy of the ice-water system decreases.
- Positive work is done on the ice-water system by the atmosphere.
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The Correct Option is D
Solution and Explanation
Volume decreases during melting of ice so positive work is done on ice water system by atmosphere.
Heat absorbed by ice water so \( \Delta Q \) is positive, work done by ice water system is negative.
Hence by first law of thermodynamics \( \Delta U = \Delta Q + \Delta W = \) Positive So internal energy increases.
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