M1(соли)=70*0.1=7г
m2(соли)=80*0.05=4 г
m(всей соли)=11 г
w=11/150=0.073=7.3%
M=300*0.05=15 г
..............................
SO2=32+2*16=32+32=64
S=50%
O2=50%
LiH=7+1=8
Li=7*100%/8=87,5%
H=12,5%
СrO3=52+16*3=100
Cr=52%
O3=50%
CH4=12+4*1=16
C=12*100%/16=75&
H4=25%
Еще один пример:
Mr(H3PO4<span>) = 3·Ar(H) + Ar(P) + 4·Ar(O) = 3·1 + 31 + 4·16 = 98
</span>w(H) = n(H)·Ar(H)·100% / Mr(H3PO4<span>) = 3·1·100% / 98 = 3,06%</span>