Respuesta :

mouraj
 sodium carbonate decahydrate is Na2CO3.10H20 

Its weight is - 23 * 2 + 12 + 48 + 10 * ( 2 + 16 ) = 106 + 180 = 286 

Water %age = 180 / 286 * 100 = 62.94%
I believe it is 62.94