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142-100%
46-x
x= 32,4% sód
b)Pb(NO3)2= 331g/mol
331-100%
207-x
x=62,5% ołów
c)AlCl3=133,5g/mol
133,5-100%
27-x%
x=20,2% wiec chlor 100-20,2=79,8%
AlCl3=133.5g Al=20.22% Cl=79.78%
NaSO4=119g Na=19.33% S=26.89% O=53.78%
Pb(NO3)2= 331g Pb=62.54% N=8.46% O=29%