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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: anon13 on October 16, 2009, 08:04:32 PM

Title: Moles and Molecules
Post by: anon13 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?

Title: Re: Moles and Molecules
Post by: Schrödinger 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?