By operating a reversible thermal machine with an ideal gas as the working substance in a Carnot cycle (see figure) and measuring the ratio Q_F /Q_Q , we can calculate: (a) n, the number of mols of the ideal gas. b) the ratio V₂ /V₃ c) the ratio P₁ / P₄ d) the ratio (P₁ V₁) / (P₃ V₃) (e) the value of Avogadro's number. f) None of the above.

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