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  • weight to mol percent

    how to convert 15 mole percent of styrene (MW=104 g/mol) to weight percent, if we know the other monomer M (MW= 54 g/mol) is 85 mole % in the polymer?
    Is this info enough or dowe need more data to get the conversion?

  • #2
    Re: weight to mol percent

    Originally posted by www
    how to convert 15 mole percent of styrene (MW=104 g/mol) to weight percent, if we know the other monomer M (MW= 54 g/mol) is 85 mole % in the polymer?
    Is this info enough or dowe need more data to get the conversion?
    Imagine that you have 100 moles total mixture, 15 moles styrene, 85 moles of the other monomer.

    The weights of the mixture components are 15 moles*104 g/mol = 1560 g styrene, and 85 moles * 54 g/mole = 4590 g of the other monomer.


    The total mixture is 1560 g + 4590 g = 6150 g,
    and the weight ratio of styrene to total mixture is
    1560 g/6150 g = 25.4%

    Since we postulated 100 moles, and total weight is 6150 g, the average molar mass of the mixture is 61.5 g/mol, and you can get the same answer as
    15% * 104 g/mol / 61.5 g/mol (this "average" approach is often used for pollutants mixed in air)

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    • #3
      Re: weight to mol percent

      John thanks a lot for the explanation. It seems very simple now.

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      • #4
        How to calculate mol percent

        5mol percent of 6.26grm of Bi2O3

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        • #5
          Re: How to calculate mol percent

          Originally posted by Unregistered View Post
          5mol percent of 6.26grm of Bi2O3
          I want to know how to calculate 10 mol % of CuO

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          • #6
            Re: How to calculate mol percent

            I want to know how to calculate 10 mol % of para toluene sulphonic acid

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            • #7
              Re: weight to mol percent

              the mole%of sodium hydroxide weight of 100gm.

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              • #8
                Re: weight to mol percent

                Originally posted by Unregistered View Post
                the mole%of sodium hydroxide weight of 100gm.
                Approximate molar mass is (23 + 16 + 1) g/mol or 40 g/mol
                100 g is about 2.5 mol. No percent involved.

                If it is pure sodium hydroxide then it is 100% sodium hydroxide whether by weight, volume, or molar ratios. Percent and parts per million are for mixtures of one thing in another thing.

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                • #9
                  Re: weight to mol percent

                  What if I am given a molar flow rate (300mol/h) for a gas stream but am given %wt percents for each species in the stream? How can these be converted to mol%?

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                  • #10
                    Re: weight to mol percent

                    Originally posted by Unregistered View Post
                    What if I am given a molar flow rate (300mol/h) for a gas stream but am given %wt percents for each species in the stream? How can these be converted to mol%?
                    First, are you sure they are weight percents? Gases are usually specified by molar percents or partial pressures (the same if you assume ideal gas law).

                    If they are percent by weight, divide by the molecular weight of the species and multiply by the (average) molecular weight of the mixture.

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                    • #11
                      Re: weight to mol percent

                      Yes they are wt%. There are three species. I want to turn them into mol%.

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                      • #12
                        Re: %v/v to %M/M

                        Please assist me on converting Percentage v/v to Percentage M/M

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                        • #13
                          Re: weight to mol percent

                          Originally posted by Unregistered View Post
                          Yes they are wt%. There are three species. I want to turn them into mol%.
                          It would help if you say what they are, what the weight % is, and how they are being measured?

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                          • #14
                            Re: weight to mol percent

                            HOW TO CALCULATE % oF mETHYL MAGNESIUM CHLORIDE CONTENT BY TITRATION METHOD

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                            • #15
                              Re: weight to mol percent

                              Originally posted by Unregistered View Post
                              HOW TO CALCULATE % oF mETHYL MAGNESIUM CHLORIDE CONTENT BY TITRATION METHOD
                              Do you have any further information? This is not enough to go on sorry.

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