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8 July, 21:37

A certain protein was found to contain 0.870% Cobalt by mass. Determine the minimum molecular mass of the protein in amu.

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  1. 8 July, 22:03
    0
    0.870% Cobalt by mass can be written as a ratio:

    0.870 amu Co : 100.000 amu (total protein)

    Therefore,

    55.85 amu Co = (100.000 amu total protein) / (0.870 amu Co) = 698881.25 amu

    rounded to 3 significant figures:

    We get,

    69,900 amu
  2. 8 July, 22:05
    0
    0.870% Cobalt

    Ratio of cobalt can be written as:

    0.870 amu Co : 100.000 amu (total protein)

    Therefore,

    58.6 amu Co = (100.000 amu total protein) / (0.870 amu Co) = 698881.25 amu

    rounded the figure, we get

    69999 amu
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