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Cate grame de fosfor se gasesc in 49 grame de acid fosforic?

Răspuns :

MH3PO4=3×AH+AP+4×AO=3×1+31+4×16=98g
98gH3PO4.....31gP
49gH3PO4......xgP
x=31×49/98=calculeaza