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What's this: dm^-3?
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Someone Ask me AP Chem Questions
Ahmed- NH Admin
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The Banker- NH Member
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"per dm cubed"
Ahmed- NH Admin
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What's dm?
The Banker- NH Member
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decimetre
1 decimetre cubed = 1000 centimetre cubed
1 decimetre cubed = 1000 centimetre cubed
Ahmed- NH Admin
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Somethings wrong with the Q. You made no separation between the moles and the dcm^3.
The Banker- NH Member
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ahmed, its unit is "mole per decimetre cubed"..
Ahmed- NH Admin
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NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
'Nother question please
'Nother question please
The Banker- NH Member
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ahmed, solve the question 
use the pencil method
use the pencil method
Ahmed- NH Admin
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I don't know the pencil method. And that Q is confusing.
Justice- NH Member
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Come on you got a 90 averge right? I will give you a hint. (use your text book)
Ahmed- NH Admin
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Wait this is in our textbook?? What chapter?
The Banker- NH Member
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1000 cm^3 contains 0.05 mols
250 cm^3 contains X mols
X= (0.05*250)/1000
X= 0.0125 mols
So we need 0.0125 mols of Na2CO3.10H2O
Mr of Na2CO3.10H2O:
(2*23)+12+(3*16)+(10*18)= 286
As mole = mass/Mr
So mass = mole*Mr
= 0.0125*286
= 3.575 grams of Na2CO3.10H2O
250 cm^3 contains X mols
X= (0.05*250)/1000
X= 0.0125 mols
So we need 0.0125 mols of Na2CO3.10H2O
Mr of Na2CO3.10H2O:
(2*23)+12+(3*16)+(10*18)= 286
As mole = mass/Mr
So mass = mole*Mr
= 0.0125*286
= 3.575 grams of Na2CO3.10H2O
Ahmed- NH Admin
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I hate seeing dcm^3...I get lost lol
Doc- NH Member
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i claim this thread
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