m(H3PO4) =n*M= 5моль*98г/моль= 490г
M(H3PO4) = 1*3+31+16*4=98г/моль
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m(H3PO4) =n*M= 5моль*98г/моль= 490г
M(H3PO4) = 1*3+31+16*4=98г/моль