Hydrogen gas and fluorine gas react to form hydrogen fluoride, HF. Calculate the enthalpy change (in kJ) for the conversion of 15.0 g of H₂ ​(g) to HF(g) at constant pressure.
a. H₂ ​(g) + F₂ ​(g) ⟶ 2HF(g) ΔH = -536 kJ