7.
H227-H02+H2-H4
P20-P260-P264-P270-P20-P0+P0+P-P02+P52-P04+P40-P0-P62+P64-P6-P70+P7-P40-P405-P50
265
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质量 (g) = 浓度 (mol/L) × 体积 (L) × (g/mol)