anonymous
  • anonymous
a 10.00 gram sample of a soluble barium salt is treated with an excess of sodium sulfate to precipitate 11.21 grams BaSO4, (M= 233.4). which barium salt is it?
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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taramgrant0543664
  • taramgrant0543664
So let's start with the chemical equation (let's let X represent the unknown element) BaX+Na2SO4 --> BaSO4+NaX
taramgrant0543664
  • taramgrant0543664
Next step is to determine the number of moles to do this we have the mass of our products of 11.21g we also know the molar mass of 233.4 n=mass/molar mass
taramgrant0543664
  • taramgrant0543664
n=11.21/233.4=? @dahlinal

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taramgrant0543664
  • taramgrant0543664
@dahlinal im more than happy to help but I can't just give you the answer I'm happy to walk you to it, but you're going to have to do some work here too
anonymous
  • anonymous
n= 0.0480
taramgrant0543664
  • taramgrant0543664
Yes so now we have to reverse it we have the moles and we have the weight and we will use it to determine the molar mass of the BaX
taramgrant0543664
  • taramgrant0543664
Molar mass= 10/0.048
anonymous
  • anonymous
208.33
taramgrant0543664
  • taramgrant0543664
Perfect so we know that the molar mass of the BaX=208.33 So if we subtract the molar mass of the barium we can find the molar mass of our unknown 208.33-Ba=x
taramgrant0543664
  • taramgrant0543664
Molar mass of barium is 137.33g/mol
anonymous
  • anonymous
71
taramgrant0543664
  • taramgrant0543664
Perfect so that is the molar mass but we have to look back at the chemical formula BaX+Na2SO4 --> BaSO4+Na2X
taramgrant0543664
  • taramgrant0543664
Ba has an oxidation number of 2+ so our unknown is actually X2 so we have to divide our mollar mass we found and divide that by 2
anonymous
  • anonymous
35.5
taramgrant0543664
  • taramgrant0543664
Yep and there is an element that has that molar mass
anonymous
  • anonymous
Cl
taramgrant0543664
  • taramgrant0543664
Also the actual chemical formula is BaX2+Na2SO4 --> BaSO4+2NaX
taramgrant0543664
  • taramgrant0543664
And yes it is chlorine as your unknown
anonymous
  • anonymous
thank you!
taramgrant0543664
  • taramgrant0543664
No problem! Happy to help!

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