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Help! How to work out mass of water of crystallisation: Chemistry A level

I have spent hours trying to solve this question but no method has led me to the final answer which matches the textbook answer.


Q: Calculate which of the following contains the greatest mass of water of crystallisation?


- 6.44g of Na2S04 *10H20

- 2.46g of MgSO4 * 7H20

- 13.5g of Al2(S04)3 *6H20

The answers are as follows:

A: Water mass
1) 3.6g
2) 1.36 g
3) 3.24g

I don't understand how to derive the mass of water. Please help!
Sorry you've not had any responses about this. :frown: Are you sure you've posted in the right place? :smile: Here's a link to our subject forum which should help get you more responses if you post there. :redface:

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