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Masa fosforu - 31u
masa tlenu - 16u
masa H3PO4 - 3 * 1u + 31u + 4 * 16u=98u
31u/98u*100%=0,3163*100%=31,63%
3H <masa wodoru> = 3 * 1u = 3u
P <masa fosforu> = 31u
4O <masa tlenu> = 4* 16u = 64u
masa <razem>
3 +31+64 = 98
98 - 100%
31 - x
31*100 / 98 = <w przyblizeniu> 31,63 %
:)