Odpowiedzi

2009-12-15T20:25:38+01:00
MH3PO4=3*mH+mP+4*mO=3+31+64=98g

mH3=3


98g-100%
3g-x
_________
x=3,06%
2009-12-15T20:28:41+01:00
H3PO4 = 3*1u+1*31u+4*16u=98u

98u-100%
3u-x%

X=3u*100% / 98u = 3,06%