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Masa molowa Na2O = (23 x 2) + 16 = 62g/mol
Masa molowa NaOH = 23+16+1= 40g/mol
Na2O NaOH
62g - 2 x 40g
m - 20g
62g x 20g
m= ---------------
80g
m= 15,5 g
mNaOH=23u+16u+1u=40u
Na2O + H2O--->2NaOH
62g Na2O-----2*40g NaOH (dane z reakcji)
xg Na2O-------20g NaOH (z treści zadania)
x=62*20/80
x=15,5g Na2O