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Thread: Chemistry help?

  1. #1
    Vicious Trollop Kimm's Avatar
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    Chemistry help?

    Is anyone here good at chemistry? We are stuck on how to do a problem. We think we know something, but we are not sure.

    To make 44.0g of carbon dioxide, you must combine 12.0g of carbon with 32.0g of oxygen. If a chemist combines 120.0g of carbon with 160.0g of oxygen, how many grams of carbon dioxide will be made? If a substance is left over, indicate whether it is carbon or oxygen, and also determine how many grams are left over.

    Anyone? We want to know HOW to do it. One answer we came up with was 200g of carbon dioxide with 80g of oxygen leftover, but we have no idea if we are doing it correctly.

  2. #2
    Premier Sponsor Kay's Avatar
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    Chemistry help?

    I'll try. So for every 44g of carbon dioxide you need 12g carbon and 32g of oxygen. With only 160g of oxygen available you can only make carbon dioxide 5 times for a total of 220g. Hold on. I did something wrong.


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    Premier Sponsor Kay's Avatar
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    I am getting paper out. Lol. I'll try again in a minute.


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  4. #4
    Premier Sponsor Kay's Avatar
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    Nope. I think I am right. You would have 220g carbon dioxide with 60g carbon left


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  5. #5
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    The ratio is 12:32. You are limited by the 160 because in order to use all the carbon (120g) you would need 320g of oxygen to maintain the ratio. Set up an equation so 12/32 =×/160. Cross multiply and you get 60. For 160 g O you use 60g C. That makes 220g CO2. I think.
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  6. #6
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    Oh yeah, and 60g C left over.
    "You can bomb the world to pieces, but you can't bomb it into peace."



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  7. #7
    Vicious Trollop Kimm's Avatar
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    You are both 100% correct. After I posted this, I remembered that my best friend is a nurse. She gave me that exact answer. Apparently, her undergrad was in chemistry. I think I am sending Matthew to live with her for the year.

    Thanks for the help!!

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    Premier Sponsor Peanut's Avatar
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    Kimmn, I think this sort of thing would be the best part of homeschooling. I'd relearn everything I've forgotten while teaching it to my kid!

  9. #9
    Vicious Trollop Kimm's Avatar
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    I am relearning everything. I enjoy relearning the math. I hated chemistry in high school though and I pretty much still do. He goes to a teacher for this class, but I still have to help him at home. Sometimes, it's like a foreign language. Whenever I don't get it, I usually tell him to email the teacher.

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    I'm reporting all of you to the EPA for producing large quantities of a known toxin.

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