M Na2S=78g/mol
78g Na2S----1mol
234g Na2S-----xmoli
x = 3mole
Z def. stęż. molowego
3mole Na2S------6dm3 roztworu
xmoli Na2S-------1dm3 roztworu
x = 0,5mola Na2S
x = 0,5mol/dm3
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M Na2S=78g/mol
78g Na2S----1mol
234g Na2S-----xmoli
x = 3mole
Z def. stęż. molowego
3mole Na2S------6dm3 roztworu
xmoli Na2S-------1dm3 roztworu
x = 0,5mola Na2S
x = 0,5mol/dm3