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Posted by on Monday, July 1, 2013 at 11:36am.

A throat lozenge contains 5.0mg of menthol, which has the formula C10H20O.
a. How many moles of menthol are in 5.0 mg of menthol?
b. What is the mass in grams of 1.56 moles of menthol?

a. I got 3.2 x 10^-5 mole is that correct?
b. Not sure how to do this problem. I do know that the mass in grams for 1 mol is 156.268.

  • CHEMISTRY - , Monday, July 1, 2013 at 11:43am

    since you know the molar mass,

    (a)
    .005g * 1mole/156.268g = 3.2*10^-5
    you are correct

    (b)
    you know 1 mole is 156.268g, so
    1.56 moles = 1.56 * 156.268 = 243.78g

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