Answer to Question #123905 in General Chemistry for Tiffany

Question

2Ca(s)+O2(g) → 2CaO(s)
ΔH∘rxn= -1269.8 kJ; ΔS∘rxn= -364.6 J/K

For this problem, assume that all reactants and products are in their standard states.

Calculate the free energy change for the reaction at 27 ∘C.
Express your answer using four significant figures.

Answer 1

$∆G= ∆H-T∆S$

$∆G= -1269800 joules - 300*(-364) joules$

∆G=-1160600 joules

∆G = - 1160.6 kJ