| | Someone Ask me AP Chem Questions |  |
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Ahmed
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 |  Subject: Re: Someone Ask me AP Chem Questions  Sat May 08, 2010 8:06 pm | |
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The Banker
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:07 pm | |
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Ahmed
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:09 pm | |
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The Banker
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:11 pm | |
| decimetre
1 decimetre cubed = 1000 centimetre cubed | |
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Ahmed
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:14 pm | |
| Somethings wrong with the Q. You made no separation between the moles and the dcm^3. | |
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The Banker
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:15 pm | |
| ahmed, its unit is "mole per decimetre cubed".. | |
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Ahmed
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:16 pm | |
| NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO 'Nother question please  | |
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The Banker
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:17 pm | |
| ahmed, solve the question  use the pencil method | |
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Ahmed
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:21 pm | |
| I don't know the pencil method. And that Q is confusing. | |
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Justice
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:24 pm | |
| Come on you got a 90 averge right? I will give you a hint. (use your text book) | |
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Ahmed
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:25 pm | |
| Wait this is in our textbook?? What chapter? | |
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The Banker
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:26 pm | |
| 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 | |
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Ahmed
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| | Subject: Re: Someone Ask me AP Chem Questions Sat May 08, 2010 8:26 pm | |
| I hate seeing dcm^3...I get lost lol | |
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Doc
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| | Subject: Re: Someone Ask me AP Chem Questions Mon May 17, 2010 9:50 pm | |
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