Determine whether each of the following statements about the thermodynamic funct

Question

Determine whether each of the following statements about the thermodynamic functions are True or False as they apply to chemical reactions.


True False  Negative entropy changes increase spontaneity.
True False  Positive enthalpy changes increase spontaneity.
True False  Entropy and enthalpy are included in the Gibbs free energy.
True False  All spontaneous chemical reactions have positive entropy changes.
True False  The heat of reaction at constant volume is always equal to the heat of reaction at constant pressure.

Explanation / Answer

1.Negative entropy changes increase spontaneity. ---- False,

Spontaneity of reaction does not depend on system entropy. entropy increases in universe must be +ve for spontaneity run.

2. Positive enthalpy changes increase spontaneity. ----- False.

Run spontaneity does not depend on enthalpy.

3. Entropy and enthalpy are included in the Gibbs free energy. ---- True.

We know G= H-TS

4. All spontaneous Chemical rxn have positive entropy changes. ---- False.

For spontaneous rxn, delt G value is -Ve.

For spontaneous run, delta S value of universe + ve.

5.The heat of reaction at constant volume is always equal to the heat of reaction at constant pressure. -----False.

Delta U= nCvdT

Delta H= nCpdT. For ideal gas , Cp-Cv=nR

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