Thread: A stupid chemistry problem

  1. #1

    A stupid chemistry problem

    Okay here is a chemistry problem that I have done, I wanted to check it with other people...btw this stuff is really hard to me so don't be too critical...

    The problem:
    there are 6.02E23 atoms of mercury in 201g of mercury, the density of mercury is 13.5g/mL. What is the volume of the same liquid, in micro m3, occupied by one atom of mercury?

    My final solution:
    One atom takes up:
    2.45E-23 mL

    How I solved it:
    If 201g of mercury has 6.02E23 atoms, then 13.5g of mercury must have 6.02E23 / (201/13.5)
    NumberOfAtoms = 6.02E23 / (201/13.5)
    NumberOfAtoms = NumberOfAtoms * (1mL / NumberOfAtoms)

    Do you think I'm correct? Chemistry sucks

  2. #2
    Mayor of Awesometown Govtcheez's Avatar
    Join Date
    Aug 2001
    That's what I got, too... This really isn't chemistry - it's just math...

  3. #3
    Thank you for 1) Posting 2) Backing up my answer
    I agree that it's just math. I'm supposed to be using factor labeling, I don't know if you know what that's just a way of setting up your conversions. Well anyway I didn't use factor labeling, I just did it like I would any other normal math problem. Anyways I don't even know how to set up this problem using factor labeling. I have another chemistry problem I'd like to check sometime later, and it actually has some factor labeling involved, but liek it's converting mm to cm... 1mm ='s easy stuff, the rest I did without factor labeling

  4. #4
    If a frying pan needs a Teflon coating that is 1.0mm thick, and the area covered is 36 square inches, how many pounds of teflon are required to coat the pan?
    teflon has a density of .805g/cm3

    My solution:

    How I got it:
    First I found the volume of the teflon in cm3
    Volume = 1mm(36inches)
    Volume = .1cm(2.54 * 36)^2 //2.56cm = 1inch
    Volume = 8.36E2cm^3
    //Now I find the total mass in grams then convert it to pounds
    //the density of teflon is .805 g for every cm3
    Total mass in grams = .805 * Volume
    Total mass in grams = .805 * 8.36E2cm^3
    Total mass in grams = 6.72E2g

    //Now convert to lbs, 1g = .002lb
    6.72E2 (.002) = 1.32E-2lbs

    If anyone could either back me up of help explain to me why it is wrong I would be very happy.

    I am always thinking of ways to incorporate a C++ program into homework so if you have any cool ideas that a program could do I'm all ears.

  5. #5
    Confused Magos's Avatar
    Join Date
    Sep 2001

    The first time I've seen a triple posting...!!!
    <Dark Voice>Shame on you!</Dark Voice>

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  6. #6
    Yes I know, actually quadruple posting if you want more shock value, and also I found a BLATANTLY GLARING problem with what i did before...I'm fixing it right now...

  7. #7
    Okay the actual answer is 3.7E-2, how I got there isn't important because I don't need help anymore...I confirmed the answer with a friend on the phone and she said it's correct so thanks if you were going to helpme anyways

  8. #8
    Microsoft. Who? MethodMan's Avatar
    Join Date
    Mar 2002
    Am I glad I never took chemistry, although that did close the door on me going into engineering.

    Your Move:Life is a game, Play it; Life is a challenge, Meet it; Life is an opportunity, capture it.


  9. #9
    Seeking motivation... endo's Avatar
    Join Date
    May 2002
    OMG, this has illustrated how much I've forgotten since I did my chemistry degree!!!
    Couldn't think of anything interesting, cool or funny - sorry.

  10. #10
    The Earth is not flat. Clyde's Avatar
    Join Date
    Mar 2002
    you did a chemistry degree and you struggled with that?

  11. #11
    Banal internet user
    Join Date
    Aug 2002

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