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Urgent as chemistry calculation help!!

A mixture of MgSO4.7H2O and CuSO4.5H2O is heated at 120°C until a mixture of the anhydrous compounds is produced. If 5.00 g of the mixture gave 3.00 g of the anhydrous compounds, calculate the percentage by mass of MgSO4.7H2O in the mixture.
I HAVE BEEN STUCK ON THIS FOR HOURS!! I got a final answer but it's wrong, as it's meant to be 26.6%.
ANY HELP WILL BE APPRECIATED.
20181027_231408-compressed.jpg.jpeg

A slight difference might be due to rounding errors and using different molar masses :smile:
Reply 2
Original post by Arctic Kitten
20181027_231408-compressed.jpg.jpeg

A slight difference might be due to rounding errors and using different molar masses :smile:


Damn clever... Maine Coon
Can I ask where you got the question from? Im looking for some challenging questions to practice
Original post by username2199397
Can I ask where you got the question from? Im looking for some challenging questions to practice

From chemsheets website - you need to get the subscription however for £14 for one year :smile:
Where did you get a from?
Because if you solve the equation you get a and b? not a on its own?
Can you please show how you did it?
Thanks
Original post by Arctic Kitten
20181027_231408-compressed.jpg.jpeg

A slight difference might be due to rounding errors and using different molar masses :smile:

That doesn’t make sense. Where did you get 5.36x10^-3 from?

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