Question

When is a reaction with a positive enthalpy spontaneous?

when the temperature is high and the change in entropy is positive
when the temperature is low and the change in entropy is positive
when the temperature is high and the change in entropy is negative
when the temperature is low and the change in entropy is negative
when the product of the temperature and the change in entropy are negative

Answer 1

ΔG=ΔH-TΔS
G-Gibbs free energy
H-enthalpy
T-temperature
S-entropy
Reaction is spontaneous when ΔG is less than 0.
When the temperature is high and the change in entropy is positive is right answer.