For a certain reaction ∆H is 54 kJ/mol and ∆S is 128 J/mol · K. This reaction can become spontaneous only above some temperature.
What is this temperature?
Answer in units of ◦C.
dG = dH - TdS
If dG = 0, then
TdS = dH.
Solve for T.
Watch the units. dH is in kJ/mol and dS in J/mol