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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: tou on February 11, 2008, 03:57:55 PM

Title: How many Oxygen atoms in 1g of vitamin C?
Post by: tou on February 11, 2008, 03:57:55 PM

Hi

I don't know how to get the correct answer, I've tried but I failed to answer the question.

Question: When you consume 1.00g of vitamin C, how many oxygen atoms are you eating?

Vitamin C: C₆H₈O₆

The answer: 2.05 x 10²²

Thank you very much!

Title: Re: How many Oxygen atoms in 1g of vitamin C?
Post by: DevaDevil on February 11, 2008, 04:14:31 PM

First of all you should show you at least tried.

But I will give you a start: first calculate how many moles of vitamin C you have in 1.00 gram

Title: Re: How many Oxygen atoms in 1g of vitamin C?
Post by: tou on February 11, 2008, 04:43:03 PM

Nr. of moles in vitamin C: 5.68 x 10^-3

Then I thought, I should calculate the number of particles, thus the nr. of moles x 6.02 x 10²³.

That is: 3.41 x 10²¹

Thus 1g of vitamin C contains 3.41 x 10²¹ particles/atoms.

Now I am not sure what the next step is...

Title: Re: How many Oxygen atoms in 1g of vitamin C?
Post by: Borek on February 11, 2008, 04:58:32 PM

Almost there :)

Look at the formula - how many atoms of oxygen per 1 molecule?

Title: Re: How many Oxygen atoms in 1g of vitamin C?
Post by: tou on February 11, 2008, 05:28:34 PM

Aha... 3.41 x 6 = 2.05 x 10²²

Now I wonder why I wasn't able to do it before,  ::) :)

Thank you!