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Gibbs Free Energy & Spontaneity

A Carnot engi...

Question

A Carnot engine takes heat from a reservoir at $627^{\circ} C$ and rejects heat to a sink at $27^{\circ} C$ . Its efficiency will be

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Solution

Temperature in kelvins are 300 K and 900 K.
So, efficiency $= 1 - (\frac{300}{900}) = \frac{2}{3}$

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