Mass of an anhydrous compound

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  • #1
Homework Statement:
What is the mass of CuSO4 if the mass of CuSO4.H2O is 61 grams
Relevant Equations:
CuSO4.H2O
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Answers and Replies

  • #2
Bystander
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Have you read the rules for the forum?
 
  • #3
Have you read the rules for the forum?
There are rules?
 
  • #4
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You need to make an attempt at the solution, show some work.
 
  • #5
I just tried re working it and showing work but I have no idea what I'm doing and I tried using my noted but its no help
 
  • #6
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Where IS your work?
 
  • #8
Office_Shredder
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Post it here so someone can help you figure out what you're doing wrong.
 
  • #10
Borek
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In the future please show your effort when starting the thread, not an hour after. We can't comment on things we don't see.

Your logic is mostly OK, but check the molar masses you are using.
 
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  • #11
symbolipoint
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Homework Statement:What is the mass of CuSO4 if the mass of CuSO4.H2O is 61 grams

Relevant Equations:CuSO4.H2O
Calculate or find the formula weights for cupric sulfate and cupric sulfate tetra-hydrate mono-hydrate. You can find the fraction of cupric sulfate in the hydrated compound. You will be able to form a very straightforward proportion.
 
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  • #12
mjc123
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The question refers to the monohydrate.
 
  • #13
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Calculate or find the formula weights for cupric sulfate and cupric sulfate tetra-hydrate. You can find the fraction of cupric sulfate in the hydrated compound.
"Penta-hydrate," I'm unaware of the existence of either mono-, or tetra-hydrates. Did not point that fact out, since it provides/exemplifies additional instructional/nomenclatural/pedagogical opportunities for the OP. The significance of small whole numbers/fractions in discussing "hydrates" is important.
 
  • #14
symbolipoint
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I MISREAD PART OF THE FORMULA. I WILL CHANGE MY RESPONSE IMMEDIATELY.
 
  • #15
Borek
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"Penta-hydrate," I'm unaware of the existence of either mono-, or tetra-hydrates.
They do exist, which is why the question as posted looked OK to me. There is no tetrahydrate, it is not clear to me what is the status of dihydrate (I thought it does exist, quick googling suggest it doesn't).
 

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