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Math Help - Kelvin

  1. #1
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    Kelvin

    Hi, I am new to this forum. I'm trying to help my daughter with a chemistry problem and need some help. I believe it falls into the algebra catagory so I hope I can get help here. I have been able to help her convert from celcius to F and from F to celcius so far, but this problem does not work out for me....

    C= 5/9(-80.0-32)

    the correct answer is shown as 62.2 in the example but I can't figure out how to get there??
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  2. #2
    MHF Contributor undefined's Avatar
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    Quote Originally Posted by binmygarden View Post
    Hi, I am new to this forum. I'm trying to help my daughter with a chemistry problem and need some help. I believe it falls into the algebra catagory so I hope I can get help here. I have been able to help her convert from celcius to F and from F to celcius so far, but this problem does not work out for me....

    C= 5/9(-80.0-32)

    the correct answer is shown as 62.2 in the example but I can't figure out how to get there??
    Hi and welcome to the forum!

    For converting -80.0 degrees F to degrees C, I get -62.2, not 62.2.

    Also, why did you make the thread title "Kelvin" when there is no mention of Kelvin in the problem?
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  3. #3
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    Oh sorry...this is just one step in solving for Kelvin....I can't get past this step though. I do not have a strong background in Chemistry.

    You said you get -62.2, can you show how you got that answer. Also, what about the -32.
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  4. #4
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    Quote Originally Posted by binmygarden View Post
    Oh sorry...this is just one step in solving for Kelvin....I can't get past this step though. I do not have a strong background in Chemistry.

    You said you get -62.2, can you show how you got that answer. Also, what about the -32.
    Using a calculator? -80-32 = -112. Multiply that by 5/9 and you get -62.2222... which you then round to -62.2.
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  5. #5
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    using a simple calculator...don't have a scientific one yet. I made a mistake...the answer is negative in the book. I did not convert to decimal before multiplying. I see how to get the answer now. Still, when I converted C to F as well as F to C in earlier problems, I did solve using 5/9 and the other number over 1 and I was able to get the correct answer. Why do I get the wrong answer when I tried to solve using 5/9 x -112/1 ??
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  6. #6
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    Quote Originally Posted by binmygarden View Post
    using a simple calculator...don't have a scientific one yet. I made a mistake...the answer is negative in the book. I did not convert to decimal before multiplying. I see how to get the answer now. Still, when I converted C to F as well as F to C in earlier problems, I did solve using 5/9 and the other number over 1 and I was able to get the correct answer. Why do I get the wrong answer when I tried to solve using 5/9 x -112/1 ??
    Please provide the wrong answer you got.
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  7. #7
    MHF Contributor Unknown008's Avatar
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    Maybe your calculator is recording it as:

    \frac{5}{9 \times -112}

    ?
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  8. #8
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    Actually that is exactly what the calculator was doing. I understand what was going wrong now. Thank you both so very much for your help. I'm sure I will be back in the future
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