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Which outcome occurs when replacing an ideal gas performing a Carnot cycle with a supercritical fluid?

A)Isobaric stages replace isothermal stages
B)The ideal efficiency cannot be reached
C)Reversible phase transitions become continuous
D)Isothermal stages replace adiabatic stages

💡 Explanation

Replacing an ideal gas with a supercritical fluid will prevent achievement of the Carnot efficiency limit because the sharp phase transition required for true isothermal heat transfer is smeared out due to lack of latent heat. Therefore efficiency drops, rather than the cycle phases changing.

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