Mr(H3PO4) = 98
W(H) = Ar(H) * n / Mr(H3PO4) * 100% = 1 *3 / 98 *100% = 3%
W(P) = Ar(P) * n / Mr(H3PO4) * 100% = 31 / 98*100% =31,6%
W(O) = Ar(O) * n / Mr(H3PO4) * 100% = 16*4 / 98 * 100% = 65,3%
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Mr(H3PO4) = 98
W(H) = Ar(H) * n / Mr(H3PO4) * 100% = 1 *3 / 98 *100% = 3%
W(P) = Ar(P) * n / Mr(H3PO4) * 100% = 31 / 98*100% =31,6%
W(O) = Ar(O) * n / Mr(H3PO4) * 100% = 16*4 / 98 * 100% = 65,3%