Final answer:
The thermochemical equation for the formation of Na2SO4 from its elements in their standard states is 2 Na(s) + S(s) + 4 O2(g) → Na2SO4(aq) ΔH°f.
Step-by-step explanation:
The thermochemical equation for the formation of Na2SO4 (sodium sulfate) from its elements in their standard states would look like the following:
2 Na(s) + S(s) + 4 O2(g) → Na2SO4(aq) ΔH°f
This equation represents the formation of 1 mole of sodium sulfate in aqueous solution and includes the standard enthalpy of formation (ΔH°f).
It's important to note that the substances are in their standard states: Sodium (Na) as solid, sulfur (S) as solid, and oxygen (O2) as gas.
The phrase 'ΔH°f' refers to the standard enthalpy change of formation, which is an intrinsic property for substances when they form from their elements in their standard states.