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 Post subject: Liquid has molecular mass of 44.0 mol-1 contains 54.5% of C,
PostPosted: Tue Apr 15, 2014 10:19 am 
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Liquid has molecular mass of 44.0 mol-1 contains 54.5% of C, 36.4% of O and 9.1% of H. Empirical formula?

A liquid has molecular mass of 44.0 mol-1 contains 54.5% of carbon, 36.4% of oxygen and 9.1% of hydrogen. What is its empirical formula?

So I"ve worked this part out:

C: 54.5/12 = 4.542/2.275 = 2
O: 36.4/16 = 2.275/2.275 = 1
H: 9.1/1 = 9.1/2.275 = 4

C2OH4..

I"ve got this far, but I"m not too sure what to do next..
Any help?
Thannks.


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 Post subject: Liquid has molecular mass of 44.0 mol-1 contains 54.5% of C,
PostPosted: Tue Feb 28, 2017 6:42 am 
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So far, youre calculations are correct.

Now find the molar mass of the empirical formula:

2C + 1O + 4H = (2 x 12 g/1 mol) + (1 x 16 g/1 mole) + (4 x 1 g/1 mol) = 44 g/mol

This matches the molecular mass aka molar mass of a molecular compound that was given to you. Therefore your answer is correct.



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