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m Na2O=6,2g
M Na2O=23*2+16=46+16=62g/mol
M NaOH= 23+16+1=40g/mol
62g/mol Na2O 6,2 g Na2O
2*40 g/mol NaOH x g NaOH
x= 8g NaOH
Na2O..........+..........H2O---------> 2 NaOH
..62g........................................80g
..6,2g........................................x
-----------------------------------------------------
x = 6,2g *80g /62g = 8g NaOH
Otrzyma się 8g NaOH.
Semper in altum..............................pozdrawiam :)