7.
H226-H-H9-H
P20-P2-P240-P24-P242-P24-P26-P264-P27-P280-P02+P2-P04+P40-P62+P64-P70+P78-P40-P0
99
质量 (g) = 浓度 (mol/L) × 体积 (L) × (g/mol)