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BITSAT2015ChemistryThermodynamics (C)Actual

Which law of the thermodynamics helps in calculating the absolute entropies of various substances at different temperatures?

Options

  1. AFirst law
  2. BSecond law
  3. CThird law
  4. DZeroth law

Correct answer

C. Third law

Step-by-step solution

The third law helps to calculate the absolute entropies of pure substances at different temperature. The entropy of the substance at different temperature. T may be calculated by the measurement of heat capacity change array l S _ T - S ₀= S = ₀^ T C _ p dt T Where S _ T = Entropy at T K array S ₀= Entropy at 0 ~K array l = C _ p _ e ~T =2.303 C _ p log T array

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