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Calculați xmoli......y molecule........158gca(oh)2

Răspuns :

X moli..........Y molecule..........158 g Ca(OH)2
1 mol.....6,022 •10 la 23 molecule....74g Ca(OH)2
=>X=158:74=2,13.
Y=2,13•6,022•10 la 23
Y=12,82686•10 la 23