oblicz skład procentowy:
a)wodorotlenku magnezu Mg(OH)2,
b)węglanu wapnia CaCO3
c)tlenku żelaza (III)Fe2O3
d)azotanu(III) wapnia Ca(NO2)2
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a) Mg(OH)2=24u + 2*(16+1)=58u=100%
Mg) O) H)
24u-----x 2*16u-----z 2*1u---------y
58u----100% 58u-----100% 58u---------100%
x=41,37% z=55,17% y=3,44%
b)CaCO3=40u + 12u + 3*16u=100u=100%
Ca) C) O)
40u------x 12u-----z 3*16u---------y
100u-----100% 100u----100% 100u------100%
x=40% z=12% y=48%
c)Fe2O3=2*56u + 3*16u=160u=100%
Fe) O)
2*56u-----x 3*16u-------z
160u----100% 160u--------100%
x=70% z=30%
d)Ca(NO2)2=40u + 2*(14 + 2*16)=132u=100%
Ca) N) O)
40u-----x 2*14u-------z 4*16u-----y
132u---100% 132u-----100% 132u---100%
x=30,3% z=21,21% y=48%