19.
H30-H31-H335
P0-P1-P-P70-P71-P0-P301+P330+P331-P303+P31+P353-P30+P30-P305+P351+P33-P330-P33-P03+P33-P05-P501
质量 (g) = 浓度 (mol/L) × 体积 (L) × (g/mol)