Converting from mole ratios to empirical formula

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Melody Zhang 3L
Posts: 35
Joined: Fri Sep 28, 2018 12:21 am

Converting from mole ratios to empirical formula

Postby Melody Zhang 3L » Thu Oct 04, 2018 5:45 pm

For problem F9 (sixth edition), how is the ratio 1 oxygen 2.67 hydrogen and 2.67 carbon converted to the empirical formula C8H8O3? I understand that the ratio is multiplied by three but I don't see how to tell what multiple to multiply the ratio with.

Manas_Varma_4B
Posts: 30
Joined: Fri Sep 28, 2018 12:29 am

Re: Converting from mole ratios to empirical formula

Postby Manas_Varma_4B » Thu Oct 04, 2018 5:50 pm

You want the numbers that are decimals to be as close as possible to a whole number.

In this case:
2.67 x 1 = 2.67 (not close to a whole number)
2.67 x 2 = 5.34 (not close to a whole number)
2.67 x 3 = 8.01 (close to a whole number)

So if you multiply all the mole numbers by 3, you get 3 oxygen, 8 hydrogen, and 8 carbon: C8H8O3

Melody Zhang 3L
Posts: 35
Joined: Fri Sep 28, 2018 12:21 am

Re: Converting from mole ratios to empirical formula

Postby Melody Zhang 3L » Thu Oct 04, 2018 5:52 pm

I see, thanks!


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