Question

What is the ΔG for the following reaction at 25°C?

SO3(g) + H2O(l) → H2SO4(l)
Given:
SO3(g):ΔG= –368 kJper mole
H2O(l):ΔG= –237 kJ per mole
H2SO4(l):ΔG= –689.9 kJ per mole

84.9 kJ

558.9 kJ

–84.9 kJ

–558.9 kJ

Answer 1

Answer: -84.9 kJ

Step-by-step explanation:

Answer 2

We write the equation as:

-368 + -237 = ΔH + -689.9

ΔH = 84.9 kJ/mol

When written outside of the reaction equation, its sign will be reversed.
Thus, ΔH = -84.9 kJ/mol

The third option is correct.