26.
H227-H0+H-H2-H40
P20-P26-P264-P270-P27-P27-P280-P02+P52-P04+P40-P0-P62+P64-P70+P78-P9-P40-P405-P50
6.
280
质量 (g) = 浓度 (mol/L) × 体积 (L) × (g/mol)