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chemistry

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a sample of glucose, c6h12o6 contains 2.03*10^21 atoms of carbon.
(a)how many atoms of hydrogen does it contain?
(b)how many molecules of glucose does it contain?
(c)how many moles of glucose does it contain?
(d)what is the mass of this sample in grams?

its kinda long, but i would appreciate it if someone would guide me through it
thank you:)

  • chemistry - ,

    Molecular weight of glucose is 180.16 g/mo and its formula is C6H1206.

    a.) 2.03 x10^21 atoms of carbon*(1 mol/6.02 x 10^23 atoms)*(12 moles of H/6 moles of C)*(6.02x10^23 atoms/mole of H)=atoms of H
    ****Notice that Avogadro's number cancels out

    b.) 2.03 x10^21 atoms of carbon*(1 mol/6.02 x 10^23 atoms)*(1 mole of glucose/12 moles of C)*(6.02 x 10^23 atoms/1mole of glucose)= molecules of glucose
    ****Notice that Avogadro's number cancels out

    c.)2.03 x10^21 atoms of carbon*(1 mol/6.02 x 10^23 atoms)*(1 mole of glucose/12 moles of C)= moles of glucose

    d.2.03 x10^21 atoms of carbon*(1 mol/6.02 x 10^23 atoms)*(1 mole of glucose/12 moles of C)*(180.16 g/mole)= glucose in grams

  • chemistry - ,

    Thank you soooooooooooo much!!!

  • chemistry - ,

    42

  • chemistry - ,

    On problem C, why is the mole for Carbon 12 and not 6. Isn't the mole of H 12?

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