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V=300cm3=0,3dm3(musza byc te same jednostki)
Cmol=0,2mol/dm3
Cmol = n/V
n=Cmol*V
n=0,2*0,3=0,06mola
Masa molowa NaNO3= 23+14+48=85g/mol lub masa molowa NaNO2= 69g/mol
n=m/M n=m/M
m=n*M m=n*M
m=0,06*85=5,1g m=0,06*69=4,14g