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wzór liczby i nazwy atomów w masa sumaryczny cząsteczce cząsteczkowa
Mg(OH)2 1 atom magnezu, a2 atomy mMg(OH)2=mMg+2*mO+2*mH=
tlenu i wodoru =24u+2*16+2*1u=58u
Br2
KCI
Ag2O, Fe2S3, K2SO3, Al2(SO4)3, (NH4)3PO4
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Br2
brom-2 atomy
Mcz Br2=2*80u=160u
KCl
potas=1 atom
chlor=1 atom
Mcz KCl=1*39u+1*35u=39u+35u=74u
Ag2O
srebro= 2 atomy
tlen=1 atom
Mcz AgO2=2*108u+1*16u=232u
Fe2S3
żelazo=2 atomy
siarka=3 atomy
Mcz Fe2S3=2*56u+3*32u=208u
K2SO3
potas=2 atomy
siarka=1 atom
tlen=3 atomy
Mcz K2SO3=2*39u+1*32u+3*16u=78u+32u+48u=158u
Al2(SO4)3
glin=2 atomy
siarka=3 atomy
tlen=12 atomów
Mcz Al2(SO$)3=2*27u+3*32u+12*16u=54u+96u+192u=342u
(NH4)3PO4
azot=3 atomy
wodór=12 atomów
fosfor=1 atom
tlen=4 atomy
Mcz (NH4)3PO4=3*14u+12*1u+1*31u+4*16u=42u+12u+31u+64u=149u
Br2...2 atomy bromu
mBr2=2*80u=160u
KCl...1 atom potasu, 1 atom chloru
mKCl=39u+35,5u=74,5u
Ag2O...2 atomy srebra, 1 atom tlenu
mAgO2=2*108u+1*16u=232u
Fe2S3...2 atomy żelaza, 3 atomy siarki
mFe2S3=2*56u+3*32u=208u
K2SO3...2 atomy potasu, 1 atom siarki, 3 atomy tlenu
mK2SO3=2*39u+1*32u+3*16u=158u
Al2(SO4)3...2 atomy glinu, 3 atomy siarki, 12 atomów tlenu
mAl2(SO4)3=2*27u+3*32u+12*16u=342u
(NH4)3PO4..3 atomy azotu, 12 atomów wodoru, 1 atom fosforu, 4 atomy tlenu
m(NH4)3PO4=3*14u+12*1u+1*31u+4*16u=149u