Question

The formation constant for the reaction

Ni2+(aq) + 6NH3(aq) ⥫⥬ Ni(NH3)6

2+(aq)

is Kf = 5.6×108

at 25°C.

(a) What is ΔG° at this temperature?

(b) If standard-state concentrations of the reactants and products

Answer 1

To find dG we use the formula,

G=-RTlnk

R is 8.314J/mol/k

T is 25+273=298k

K is 5.6×10^8

G= -8.314×298×ln(5×10^8)

G=-49,906.84J

G=-49.9kJ

b)The ΔGº < 0, that means the direct reaction is spontaneous when te reactive and products are in standard state. In other words the reaction goes to the right, to formation of products.