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4 February, 20:19

How many moles are in a pill containing 37.0mg of C12H22FeO14

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Answers (2)
  1. 4 February, 21:06
    0
    From the periodic table:

    mass of carbon = 12 grams

    mass of hydrogen = 1 gram

    mass of iron = 55.84 grams

    mass of oxygen = 16 grams

    Therefore:

    molar mass of C12H22FeO14 = 12 (12) + 22 (1) + 55.84 + 14 (16) = 445.84 grams

    number of moles = mass / molar mass

    number of moles = 0.037 / 445.84 = 82.989 x 10^-6 moles
  2. 4 February, 22:12
    0
    8.29 x 10^-5 moles. First lookup the atomic weights of all involved elements. Atomic weight carbon = 12.0107 Atomic weight hydrogen = 1.00794 Atomic weight iron = 55.845 Atomic weight oxygen = 15.999 Now calculate the molar mass 12 * 12.0107 + 22 * 1.00794 + 55.845 + 14 * 15.999 = 446.13408 g/mol Finally divide the mass by the molar mass to get the number of moles. Remember to convert the mass to grams ...0370 g / 446.13408 g/mol = 0.0000829347 moles Since 0.0000829347 is a rather inconvenient number to deal with, convert to scientific notation and round to 3 significant figures since that's the precision of the data we have. So the answer is: 8.29 x 10^-5 moles.
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