Sulphuric acid 98 %, ROTIPURAN®, for N2-determination acc. to Kjeldahl, Molar mass (M) 98,08 g/mol, Density (D) 1,84 g/cm³, Boiling point (bp) 295 to 315 °C, CAS No. [7664-93-9], UN-Nr. 1830, EG-Nr. 231-639-5, Empirical formula H2SO4