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2010-03-04T20:10:42+01:00
Na2O+H2O----->2 NaOH

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
65 3 65
2010-03-04T20:12:49+01:00
Na2O + H20 ---> 2NaOH
6,2g---------------xg
62g----------------80g
x=(6,2*80): 62
x= 8g
83 4 83