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-   -   The mole (https://www.askmehelpdesk.com/showthread.php?t=301777)

  • Jan 10, 2009, 01:27 PM
    beauty lux
    The mole
    I truly am confused by this question. It gives no specific details.
    Here it is.

    Calculate how long a chain of paper clips would be (in inches) if you had one mole of them.

    Can someone please answer this question, or at least guide me in the direction?
  • Jan 10, 2009, 01:30 PM
    Curlyben
    Break it down into things you know.

    How many atoms in a mole ?
    AND
    How long is an average paper clip ?

    Hint: The answer is a VERY large number.
  • Jan 10, 2009, 01:44 PM
    beauty lux

    Yea I kind of figured that.
    BUT
    The big factor in this is that I just enrolled in chemistry..
    Literally I don't know how to count atoms. How atoms are linked to moles or anything..
  • Jan 10, 2009, 01:51 PM
    Curlyben
    A Mole of atoms has a definition, what is it ?

    Basically there are X atoms in a mole, what is X?

    Have a read of this: http://en.wikipedia.org/wiki/Mole_(unit)
  • Jan 10, 2009, 02:00 PM
    beauty lux
    Okay.
    6.02*10 to the 23?
  • Jan 10, 2009, 02:02 PM
    Curlyben
    yep that's it.



    The rest is easy.
    Isn't learning fun ;)
  • Jan 10, 2009, 02:03 PM
    beauty lux
    :)
    What about the rest?
    This is totally confusing
  • Jan 10, 2009, 02:05 PM
    Curlyben
    Well you know what value a mole is, so now multiply by the length of a paperclip.

    Then BINGO...
  • Jan 10, 2009, 02:07 PM
    beauty lux
    Okay.one last thing.
    I am truly asking this question
    How do you count the ruler marks.
    There's like 15marks and I thought a normal ruler was different.
  • Jan 10, 2009, 02:10 PM
    Curlyben
    Now there you've got me.
    Normally the small marks are th's

    To be honest the actual length isn't really that important.
    What they are looking for here is that you have researched what a mole is.
    After all paperclips come in tons of different sizes.
  • Jan 10, 2009, 02:13 PM
    beauty lux
    Okay
    Thank you sooo much!
  • Jan 10, 2009, 02:16 PM
    Curlyben
    No worries.
    Glad to help.
  • Jan 10, 2009, 02:16 PM
    beauty lux
    One more thing.
    Okay so you helped me find the 6.02*10 23 thingy.
    Now I have the measure of the paperclip.
    1 4/16
    Now how would I use the conversion chart to do that.
    The answer has to be in inches.
    Would it be a multiple step problem?
  • Jan 10, 2009, 02:19 PM
    Curlyben
    Well the paper clip is X inches

    and a Mole () is

    so it's simply

    Inches

    Make sense ?
  • Jan 10, 2009, 02:22 PM
    beauty lux

    Lol sort of.. but then again the fraction is going to get me.
    Would the answer be a mixed number or fraction or just a whole number?
    I'm so annoying
  • Jan 10, 2009, 02:24 PM
    Curlyben
    Hey make it easy on yourself and say the paperclip is 2 inches ;)

    Did they give you the paperclip to use or was it one you found in the house.
  • Jan 10, 2009, 02:27 PM
    beauty lux
    One I found in the house.
  • Jan 10, 2009, 02:30 PM
    Curlyben
    Cool, so juts say it was 2 inches.
    Makes thing easier all round.
  • Jan 10, 2009, 02:31 PM
    beauty lux
    Okay. I think I have the answer.would the answer be 12.04*10 to the 23rd?
  • Jan 10, 2009, 02:35 PM
    Curlyben
    That's it.
    Remember the answer isn't the whole problem.

    You need to show you whole working as I laid out in #14 above.
    That's how you get the full marks.
  • Jan 10, 2009, 02:39 PM
    beauty lux

    Okay.thank you
    Can you stand for another question.(chemistry worksheet but this is the last question.) not about the same question though.
  • Jan 10, 2009, 02:40 PM
    Curlyben
    Post it up on a new thread and we'll see what can be done.
    I don't mind guiding, but I won't do the work for you.

    Show us what you have tried and we're all good.
  • Jan 10, 2009, 02:44 PM
    beauty lux
    Distance from the earth to the sun
    Okay this question is even more confusing then the first one.
    Here it is.

    The distance around the earth to the sun is apporximately 25,000 miles. Calculate how many times your paper clip chain could wrap around the earth.


    How would you begin this problem?
  • Jan 10, 2009, 02:47 PM
    Curlyben
    Right then

    I have put these two together as they are a follow on.

    Is that how the question is written as it's seems slightly confused.
    After all it mentions earth to sun and then earth on it's own.
  • Jan 10, 2009, 03:11 PM
    beauty lux

    Yeah.. I accidentally looked on the other problem.
    It is written without the sun stuff.

    The distance around the earth is approximately 25,000 miles. Calculate how many times your paper clip chain could wrap around the earth.

    That's how it is really written.
  • Jan 10, 2009, 03:12 PM
    Curlyben
    OK so again break it down.

    Forget actual numbers for now as this will get slightly messy.

    So how many inches in a mile ?
  • Jan 10, 2009, 03:14 PM
    beauty lux
    Honestly I don't know..
    I do know that there is 5280ft in a mile and there's 12inches in a foot.. so would I mutliply 5280 and 12 or something else?
  • Jan 10, 2009, 03:16 PM
    Curlyben
    Yep that's dead right.
    Here's a whole write up about it: inches

    Interesting in a geeky kind of way ;)

    So we then need to convert the Paperclip mole inches into miles.
  • Jan 10, 2009, 03:19 PM
    beauty lux
    Okay. So there's 63,360inches in a mile. So from there would I... okay.confused
  • Jan 10, 2009, 03:21 PM
    Curlyben
    Hint:



    Make sense ?
  • Jan 10, 2009, 03:22 PM
    beauty lux
    Yeah but how would the paper clips fit into all of it?
  • Jan 10, 2009, 03:24 PM
    Curlyben
    Well we know the length, in inches, of a mole of paperclips.
    So we need to convert that to miles and divide by the circumference of the earth.

    You following this ?
    Told you it gets messy

    This is one reason the SI units of measure, e.g. cm, kg, km, etc...
    http://en.wikipedia.org/wiki/Si_units
  • Jan 10, 2009, 03:29 PM
    beauty lux

    So would I multiply the paperclips to 25,000 and divide the answer by 63360?
  • Jan 10, 2009, 03:35 PM
    Curlyben
    almost.

    You need to convert the paperclips to miles.



    Then divide the 25,000 by the paperclip miles above, or the other way round.
  • Jan 10, 2009, 03:39 PM
    beauty lux
    Okay I did that and it came up zero..
    It started with .0001895*10 to the 23/25000

    Would I take the leading zeros away or no?
  • Jan 10, 2009, 03:39 PM
    Capuchin

    You need to divied the length of your paperclips in inches by 63360 to get the length of your paperclips in miles.

    THEN you divide that answer by 25,000 to get the number of times the paperclip chain will wrap around the Earth.

    Once you've done that, sit back a little bit and make sure you understand why we're dividing here.

    If you don't I could explain it a bit more in depth. (please ask! )
  • Jan 10, 2009, 03:47 PM
    beauty lux
    So, would I take 12.04/63360/25000?
  • Jan 10, 2009, 03:49 PM
    beauty lux
    Would the answer be .0327716*10 to the 23?
  • Jan 10, 2009, 03:52 PM
    Curlyben
    Remember the actual answer isn't all that important.
    How you got there is what the teacher is looking for.

    BTW, errr the number doesn't look right ;)
  • Jan 10, 2009, 03:53 PM
    Capuchin
    No, think about it, you're dividing by twice, so the answer will be somewhere close to .
    Your answer is about .
    It's important to use quick mental calculations like this to make sure your answer sounds sensible.

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