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Cmol=?
Dane:
Vr=6dm3
mNa2S=234g
Mmol Na2S=2*23g/mol+32g/mol=78g/mol
nNa2S=mNa2S/MNa2S=234g/78g/mol=3mole
Cmol=nNa2S/Vr=3mole/6dm3=0,5mol/dm3
Odp. Stężenie molowe tego roztworu wynosi 0,5mol/dm3.