For some reaction, δhº = + 50 kj and δsº = +40 j/k. the reaction will be thermodynamically favorable in the forward directionat all temperatures. at no temperature. when t > 1250 k. when t < 1250 k.

T > 1250K

Explanation:

A reaction is thermodynamically favorable when ΔG° is < 0

ΔG° is defined as:

ΔG° = ΔH° - TΔS°

As ΔG° must be < 0:

TΔS° > ΔH°

As ΔHº=+50kJ and ΔSº=+40J/K:

T×40J/K > 50000J

T > 50000J / 40J/K

T > 1250K

I hope it helps!

6.4 cm (max) - 25 cm (min)

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3