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Determinati numarul de moli existent in :

a) 25g CaCO₃=
b) 320g SO₃ =
c) 63g HNO₃ =









Răspuns :

Numarul de moli se calculeaza dupa urmatoarea formula:
n=m/M
M=masa moleculara
Deci:
320g So3
n=m/M => n=320/M =>n=320/80 =>n=4,Deci 4 moli
M=MS + 3MO=32+3*16=32+48=80

63g HNO3
M=MH + MN +3 MO=1+14+48=63
n=m/M=> n=63/63 => n=1