Question

What will be the result of a reaction if its enthalpy change is positive, its entropy change is negative and Gibbs free energy is positive?

A. Spontaneous, if the temperature is high
B. Never spontaneous
C. Always spontaneous
D. Nonspontaneous, if the temperature is low

Answer 1

@aaronq

Answer 2

try to figure it out with \(\sf \Delta G=\Delta H-T\Delta S\)

Answer 3

@aaronq Ok so it's D right??

Answer 4

nope, \(\sf \Delta G=(+y)-[T(-x)]=+y+Tx= always~positive\)

Answer 5

Ohh so it's C! thank you! :)

Answer 6

nope, recall spontaneity requires that dG<0

Answer 7

wait so it's A???

Answer 8

dG>0 always, thus it's never spontaneous

Answer 9

ok so it's B? I thought it is always spontaneous?

Answer 10

nope, a process is spontaneous when dG is negative only

Answer 11

ohh ok thank you :)

Answer 12

but yes it''s B