A reaction is non-spontaneous when:

The following reaction is non-spontaneous

A reaction is non-spontaneous at all temperature but the reverse reaction is spontaneous at all temperature. The signs (+ or -) of DeltaH and DeltaS_(sys) for the reverse reaction are _____ and _____respectively.

When DeltaG is positive, the reaction is not spontaneous. Then to make such reaction spontaneous, which method is followed?

At a certain temperature and pressure, DeltaH=0 for the reaction: X+X= X_(2) . Show that the reaction is non-spontaneous at this temperature and pressure.