# chemistry

posted by cain

A compound is found to have 61% carbon, 6.6% hydrogen, and 32.6% oxygen. What is the empirical formula of this compound?

I got C25H32H10 but the subscripts seem absurdly large.

1. DrBob222

2. cain

61/12.01 = 5.079/2.0375 = 2.5

6.6/1.008 = 6.5476/2.0375= 3.21

32.6/16 = 2.0375/2.0375= 1

I know to get the empirical formula, i Have to make these all whole numbers so I multiplied by 10 to get C25H32O10.

3. DrBob222

The error is you used H2 and not H.
6.6/1 = 6.6 so you have
C = 5
H = 6.6
O = 2
Now multiply everything by 3 to get
C 15
H 19.8
O = 6
Then round to whole numbers.
I didn't divide by the smallest number, as I'm supposed to do, I just skipped that step since I had two whole numbers already so by multiply everything by 3 I got all whole numbers. If you do it the other way, you get
C 5/2 = 2.5
H 6.6/2 - 3.3
O 2/2 = 1
Multiply everything by 6 to get
C 15
H 19.8
O 6
Hope this helps.

## Similar Questions

1. ### Chemistry

Please check my answers for the following questions. THANK YOU. 1) The empirical formula of a compound that is 25.9% nitrogen and 74.1% oxygen is.... ANSWER: N2O 2) empirical formula of a compound that consists of 4.80 grams of carbon, …
2. ### Chemistry

A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157 of the compound produced 0.213g CO2 and 0.0310 g H20. In another experiment, it is found that 0.103g of the compound produces 0.0230 g NH3. What is …
3. ### chemistry

A 25g sample of a compound composed of Carbon, Hydrogen, and Oxygen was combusted. 55grams of Carbon Dioxide and 30 grams of water were collected. A) What is the empirical formula of the compound?
4. ### Chemistry

An unknown compound contains carbon, hydrogen, and oxygen. When burned, a 2.000 gram sample of this compound releases 3.451 g of carbon dioxide and 1.059 grams of water. What is the empirical formula of this compound?
5. ### Pressure and Molecular Formula

2. How much potassium chlorate is needed to produce 20.0 mL of oxygen at 670 mm Hg and 20 degrees C. 3. A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100 degrees C and 760 …
6. ### CHEM

A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound?
7. ### chemistry

a compound contains 5.2% by mass Nitrogen. It also contains carbon, hydrogen and oxygen. Combustion of 0.085g of the compound produced 0.224g of carbon dioxide and 0.0372g of water. Calculate the empirical formula of the compound.
8. ### chemistry

2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass of the compound was found to be 60. a)What are the masses of carbon, hydrogen and oxygen in 2.4g of the …
9. ### chemistry

2.4g of a compound of carbon, hydrogen and oxygen gave on combustion, 3.52g of CO2 and 1.44g of H2O. The relative molecular mass of the compound was found to be 60. a)What are the masses of carbon, hydrogen and oxygen in 2.4g of the …
10. ### CHEMISTRY

A compound which contains hydrogen, oxygen, carbon only has molar mass of about 85 g/mol. When 0.43 g of the compound is burned in excess of oxyfen, 1.10 g of CO2 and 0.45 g of H2O are formed. Find the molecular formula and the empirical …

More Similar Questions