Question

Find the empirical formula for a compound containing 40.6% carbon, 5.1% hydrogen, and 54.2% oxygen.

Answer 1

The answer is - - HCO2

Answer 2

Explanation:

To find the ratio in moles you divide by the [A] of each element.

Using approximate values:

Ratio in grams C:H:O ⇒   40.6 : 5.1 : 54.2                                      

Ratio in moles ⇒    40.6/12 : 5.1/1 : 54.2/16            

3.38 : 5.1 :  3.38                  

⇒ [Divide each mole value by the smallest number of moles calculated.  Round to the nearest whole number. ]

3.38 / 3.38  :  5.1 / 3.38  :  3.38 / 3.38      [Dividing through by 3.38]

1:  1.5  : 1  

[ If the number is too far to round (x.1 ~ x.9), then multiply each solution by the same factor to get the lowest whole number multiple.]

1* 2  :  1.5 *2  : 1 *2    [multiply through by 2]

2  : 3  :  2

So the empirical formula is: C2H3O2  ANS

IUPAC Name   acetate

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