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First Law of Thermodynamics

When a substa...

Question

When a substance undergoes a phase change at constant temperature, its enthalpy does not change.
If true enter 1, else enter 0.

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Solution

False.

$Δ H = Δ U + Δ (P V)$
When a substance undergoes a phase change, internal energy is constant but there change in volume of the system. So, some work done on the system which led to change in enthalpy of the system.

Hence, the given statement is incorrect.

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