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Topic: Moles and Molecules  (Read 1910 times)

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Offline anon13

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Moles and Molecules
« on: October 16, 2009, 08:04:32 PM »
I'm drawing a blank and can't remember how to do this question.

A natural product has the molecular formula C17H22O8. How many carbon atoms are in 4.21 pg of this compound?

Offline Schrödinger

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Re: Moles and Molecules
« Reply #1 on: October 16, 2009, 09:56:11 PM »
Use unitary method.

n=number of carbon atoms per molecule. (here, n=17)
Let m=molecular mass of compound.(here, m=12x17 + 22x1 + 16x8 = 354)
If m gms compound has 12xn gms of carbon, then how much carbon is present in 4.21pg?
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