Mr(H3PO4) = 3Ar(H) + Ar(P) + 4Ar(O) = 3 x 1 + 31 + 4 x 16 = 98
w(P/H3PO4) = Ar(P)/Mr(H3PO4) x 100% = 31/98 x 100% = 31,63%
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Mr(H3PO4) = 3Ar(H) + Ar(P) + 4Ar(O) = 3 x 1 + 31 + 4 x 16 = 98
w(P/H3PO4) = Ar(P)/Mr(H3PO4) x 100% = 31/98 x 100% = 31,63%