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