Chemistry

posted by .

An organic compound x contains 40% carbon, 6.7% hydrogen the third compound oxygen. If the relative molecular mass of the compound is 60, calculate (i) the empirical formular of x (ii) the molecular formular of x

• Chemistry -

Take a 100 g sample which give you
40 g C
6.7 g H
100-40-6.7 = 53.3 g O

Convert these g to mols. mol = g/atomic mass.

40/12 = about 3.3 mols C
6.7/1 = 6.7 mols H

Now find the ratio of these three elements to each other. The easy way to do that is to divide the smallest number by itself, then divide the other numbers by the same small number; i.e.,
C = 3.3/3.3 = 1.0
H = 6.7/3.3 = 1.988 whch rounds to 2.0
O = 3.3/3.3 = 1.0
NOTE. If you do those mols more accurately it comes out a little better. So the empirical formula is
C1H2O for an empirical mass of 1*12 + 2*1 + 1*16 = about 30

empirical mass x number = molar mass = 60
30*number = 60
number = 2
Therefore, the molecular formula is
(CH2O)2 or C2H4O2

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

The molecular formula of a compound containg only carbon and hydrogen is to be determined. When a sample of the compound is burned on oxygen gas, 7.2 grams of water and 7.2 liters of carbon dioxide gas are produced(measured at STP). …
3. Chemistry

A certain compound contains carbon, hydrogen , and oxygen. When 1.00 grams of this compound are burned in oxygen gas 1.47 grams of CO2 and 0.600 grams of water are formed. When 2.75 grams of the compound are dissolved in 10.0 grams …
4. 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 …
5. 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 …
6. chemistry

Combustion analysis of 1.0g of a compound containing carbon , hydrogen and oxygen gives 2.3 g of carbon dioxide and 0.93g of water . If The relative molecular mass is 58. Calculate The empirical and molecular formula
7. Chemistry

Analysis of a sample of an organic compound showed it contains 39.9%carbon,6.9%hydrogen and 53.2%oxygen. a)calculate the empirical formula b)if the relative molecular mass is 60,what is the molecular formula of the compound.(C=12,H=1,O=16)
8. Chemistry

A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol
9. Science

A compound on analysis as 87:8% c,12:2%h determine its empirical formular&molecular formular given mass=56gmol
10. Science (Chemistry)

An organic compound contains 49.2% Carbon, and 9.68% Hydrogen and 19.19% Nitrogen. If Molecular Mass of compound is 146. Calculate the Molecular Formula of compound.

More Similar Questions