Question

9. A chemical reaction will occur spontaneously at constant pressure and temperature,

if the free energy is______

a) zero

b) positive

c) negative

d) none of these​

Answer 1

A chemical reaction will occur spontaneously at constant pressure and temperature if the free energy is negative.

What is a spontaneous process?

• As we know that the spontaneous process is
• TdS>dU+PdV
• If the temperature and pressure are constant then we can write as
• d(TS−U)>PdV
• ⇒d(−A)>PdV
• ⇒(dG)T,P<0
• Thus we can say that for a spontaneous process if the temperature and pressure are constant then the free energy is negative.

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