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8.1g of x so4.7h2o crystal when heated at 90°c for 15mins gave 6.9g of the...

8.1g of x so4.7h2o crystal when heated at 90°c for 15mins gave 6.9g of the salt when heated further at 120°c gave 4.9g if x is 72, calculate the stage of dehydrate realised at 90°c and 120°c .(x=72, s=32, o=10, h=1)




please solve perfectly without missing any steps... thank you?

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