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m H3PO4=3 * 1u + 31u + 4 *16= 98 u
%P= 31u / 98u *100%=31,63 %
3H-3*1u=3u
P=31u
40=4*16u=64u
H3PO4=3u+31u+64u=98u
%P=31u/98u*100%=31,63%