Areaction is non-spontaneous at any temperature whendelta h is positive and delta s is positivedelta h is positive and delta s is negativedelta h is negative and delta s is negativedelta h is negative and delta s is positive

Delta H is positive and Delta S is negative

Explanation:

The expression for the standard change in free energy is:

Where,  

is the change in the Gibbs free energy.

T is the absolute temperature. (T in kelvins)

is the enthalpy change of the reaction.

is the change in entropy.

For a reaction to be non spontaneous, it means that:-

Thus,

For the above conditions to satisfy, must be positive and must be negative.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.