GATE ME 2015 Set 1 — Question 19
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Thermodynamics → Laws & Properties → Ideal & Real Gas Behaviour
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Question
For an ideal gas with constant values of specific heats, for calculation of the specific enthalpy,
Correct answer
(A) it is sufficient to know only the temperature
Solution
For an ideal gas, the internal energy and enthalpy are functions of temperature only. The specific enthalpy is defined as . For an ideal gas, , so . Since is a function of temperature only (), is also a function of temperature only (). Specifically, for constant specific heats, , which means the change in enthalpy depends only on the change in temperature. Therefore, knowing only the temperature is sufficient to calculate the specific enthalpy.
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