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massa ... ?
Mr H3PO4 = 98
........... M = massa/Mr × 1000/mL
......... 0,4 = massa/98 × 1000/5
......... 0,4 = massa/98 × 200
. 0,4 × 98 = 200 × massa
....... 39,2 = 200 × massa
39,2/200 = massa
...... 0,196 = massa
.... massa = 0,196 gram