Question

Calculate the ΔG for the following system. Then state if the system is spontaneous or not spontaneous.

ΔH = + 25 kJ
ΔS = +5.0 J/K
T = 23°C
1.5 x 103 kJ; not spontaneous
+24 kJ; not spontaneous
+25 kJ; not spontaneous
1.5 x 103 kJ; spontaneous
+24 kJ; spontaneous
+25 kJ; spontaneous

Answer 1

Note that T = 273 + 23 = 296 K. Then, by Gibb's Free Energy:
ΔG = ΔH - TΔS
= (+25 kJ) - (296 K)(+5.0 J/K)
= (+25 kJ) - (296 K)(+0.005 kJ/K), by converting ΔS to kJ/K
= 23.52 kJ > 0.

Since ΔG > 0, the reaction is not spontaneous.

Answer 2

i still dont get it

Answer 3

+24 kJ; not spontaneous

Answer 4

thank u

Answer 5

My Pleasure.