Question

How will temperature affect the spontaneity of a reaction with positive $\Delta H$ and $\Delta S$ ?

Answer 1

At constant temperature and constant pressure, the change Gibbs free energy is defined as:
$\Delta G=\Delta H-t\Delta S$

If the change in Gibbs free energy is negative, then the reaction will be spontaneous.

When $\Delta H$ is positive $t\Delta S$ has to be bigger than $\Delta H$ so that the resulting sum would be negative.