Gold(iii) chloride, traditionally called auric chloride, is a chemical compound of gold and chlorine. With the molecular formula au₂cl₆, the name gold trichloride is a simplification, referring to the empirical formula, aucl₃. Formula: aucl3, au2cl6 molar mass: 303.325 gmol density: 4.7 gcm³ melting point: 254 °c appearance: red crystals (anhydrous); golden, yellow crystals (monohydrate)