Question

A chemical reaction has an increase in entropy and a decrease in enthalpy. What is known about the spontaneity of the reaction?

Answer 1

A chemical reaction has an increase in entropy and a decrease in enthalpy. The chemical reaction is spontaneous. A chemical reaction is spontaneous if it has an entropy greater than zero and an enthalpy less than 0

Answer 2

Answer: Reaction is spontaneous at all temperatures.

Step-by-step explanation:

According to Gibb's equation:

`\Delta G=\Delta H-T\Delta S`

`\Delta G` = Gibbs free energy

`\Delta H` = enthalpy change

`\Delta S` = entropy change

T = temperature in Kelvin

`\Delta G`= +ve, reaction is non spontaneous

`\Delta G`= -ve, reaction is spontaneous

`\Delta G`= 0, reaction is in equilibrium

Thus when
`\Delta H` = -ve (decrease in enthalpy)

`\Delta S` = +ve (increase in entropy)

`\Delta G=(-ve)-T(+ve)`

`\Delta G=(-ve)(-ve)=-ve`

Thus Reaction is spontaneous at all temperatures.