What is the value for (delta) G at 1000 K if (delta) H = - 220 kJ/mol and (delta) S = - 0.05 kJ / (molK) ?

A. - 220 kJ

B. - 270 kJ

C. 780 kJ

D. - 170 kJ

The system is isothermal, so we use the formula:

(delta) G = (delta) H - T (delta) S

Plugging in the given values:

(delta) G = - 220 kJ / mol - (1000K) (-0.05 kJ/mol K)

(delta) G = - 170 kJ/mol

If we take a basis of 1 mol, the answer is

D. - 170 kJ