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Calculati numarul de moli existenti in 255 grame de Al2O3?

Răspuns :

MAl2O3=27*2+16*3=102g/mol
m=255g Al2O3

n=m/M=255/102=2.5 moli Al2O3

n=nr moli
m=masa,g
M=masa molara,g/mol