Gibb’s free energy (G) is given by

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SSC JE ME Previous Paper 20 ( Held on: 4 March 2017 Morning)
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  1. G = H – TS
  2. \(G = \frac{H}{{TS}}\)
  3. G = U – TS
  4. None of these

Answer (Detailed Solution Below)

Option 1 : G = H – TS
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Explanation:

Gibbs free energy is a measure of the amount of energy available to do work in an isothermal and isobaric (constant temperature and pressure) thermodynamic system. This is where the term "free" comes from; it refers to the amount of energy in a system that is easily available for usage.

Gibb’s free energy is given by

G = H - TS

The Gibbs energy is thus the enthalpy (essentially the total energy of the system) minus the entropy times the temperature (a measure of the amount of energy that is unavailable).

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