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mNaOH=40u
Na₂O + H₂O ---> 2NaOH
62g Na₂O ------ 80g NaOH
25g Na₂O ------ xg NaOH
x = 32,26g NaOH
ms=32,26g
mr=100g
Cp=ms*100%/mr
Cp=32,26*100/100
Cp = 32,26%