Choose the thermochemical equation that illustrates ΔH°f for Li2SO4. Choose the thermochemical equation that illustrates ΔH°f for Li2SO4. 8 Li2SO4 (s) → 16 Li (s) + S8 (s, rhombic) + 16 O2 (g) Li2SO4 (aq) → 2 Li + (aq) + SO42 - (aq) 2 Li + (aq) + SO42 - (aq) → Li2SO4 (aq) 16 Li (s) + S8 (s, rhombic) + 16 O2 (g) → 8 Li2SO4 (s) 2 Li (s) + 1/8 S8 (s, rhombic) + 2 O2 (g) → Li2SO4 (s)

2Li (s) + ⅛S₈ (s, rhombic) + 2O₂ (g) → Li₂SO₄ (s)

Explanation:

A thermochemical equation must show the formation of 1 mol of a substance from its elements in their most stable state,.

The only equation that meets those conditions is the last one.

A and B are wrong, because they show Li₂SO₄ as a reactant, not a product.

C is wrong because Li⁺ and SO₄²⁻ are not elements.

D is wrong because it shows the formation of 8 mol of Li₂SO₄.