For the reaction 3 C 2H 2( g) → C 6H 6( l) at 25°C, the standard enthalpy change is -631 kJ and the standard entropy change is -430 J/K. Calculate the standard free energy change at 25°C

The standard free energy change is -502.86 KJ

Explanation:

ΔG° = H° -TΔS°

where;

ΔG° is the standard free energy

H° is the standard enthalpy change = -631 kJ

ΔS° is the standard change in entropy = -430 J/K

T is the temperature of the system = 25⁰C = 298 K

Applying the formula above;

ΔG° = -631 kJ - ( -0.43J/K × 298K)

      = -631 kJ + 128.14 KJ

      = -502.86 KJ

Therefore, the standard free energy change is -502.86 KJ

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).