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16 January, 13:33

A sugar crystal contains approximately 2.2*1017 sucrose (c12h22o11) molecules. part a what is its mass in mg?

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  1. 16 January, 13:54
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    From the periodic table:

    mass of carbon = 12 grams

    mass of hydrogen = 1 grams

    mass of oxygen = 16 grams

    molar mass of surcose = 12 (12) + 22 (1) + 11 (16) = 342 grams

    number of molecules = number of moles x Avogadro's number

    number of moles = number of molecules / Avogadro's number

    number of moles = (2.2x10^17) / (6.02x10^23) = 3.6544 x 10^-7 moles

    number of moles = mass / molar mass

    mass = number of moles x molar mass

    mass = 3.6544 x 10^-7 x 342 = 1.249 x 10^-4 grams = 0.12498 mg
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