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    Someone Ask me AP Chem Questions

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    Ahmed
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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on Sat May 08, 2010 8:06 pm

    What's this: dm^-3?


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    Re: Someone Ask me AP Chem Questions

    Post by The Banker on Sat May 08, 2010 8:07 pm

    "per dm cubed"
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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on Sat May 08, 2010 8:09 pm

    What's dm?


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    Re: Someone Ask me AP Chem Questions

    Post by The Banker on Sat May 08, 2010 8:11 pm

    decimetre

    1 decimetre cubed = 1000 centimetre cubed
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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on 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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    Re: Someone Ask me AP Chem Questions

    Post by The Banker on Sat May 08, 2010 8:15 pm

    ahmed, its unit is "mole per decimetre cubed"..
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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on Sat May 08, 2010 8:16 pm

    NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

    'Nother question please Very Happy


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    Re: Someone Ask me AP Chem Questions

    Post by The Banker on Sat May 08, 2010 8:17 pm

    ahmed, solve the question Razz
    use the pencil method Very Happy
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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on Sat May 08, 2010 8:21 pm

    I don't know the pencil method. And that Q is confusing.


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    Re: Someone Ask me AP Chem Questions

    Post by Justice on 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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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on Sat May 08, 2010 8:25 pm

    Wait this is in our textbook?? What chapter?


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    Re: Someone Ask me AP Chem Questions

    Post by The Banker on 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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    Re: Someone Ask me AP Chem Questions

    Post by Ahmed on Sat May 08, 2010 8:26 pm

    I hate seeing dcm^3...I get lost lol


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    Re: Someone Ask me AP Chem Questions

    Post by Doc on Mon May 17, 2010 9:50 pm

    i claim this thread

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