en la sal hidratada MgSO4 x H2O existen 60% de H2O indica el valor de x , masa atomica (Mg=24 , S=32 , O=16 , H=1 )
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Interesante ejercicio, planteamos así:
PM de la sal = 120 + 18X
Ahora planteamos:
18X = 60*(120 + 18X)/100
12X = 120
X = 10