# Chemistry

A sample of unknown ore was analyzed and fgound to contain 12.7% Al, 19.7% N,and 67.6% O. What is the empirical formula of this ore?

1. 👍 0
2. 👎 0
3. 👁 409
1. Take a 100 g sample. This will give you
12.7g Al
19.7g N and
67.6% O.

Now convert grams to moles. moles = grams/molar mass

Finally, find the molar ratio of the numbers to each other with the smallest being 1.00. You can best do that by dividing the smallest number by itself (so you get 1.00 for that), then divide the other numbers by the same small number. Then round to whole numbers.
You will get something like
AlxNyOz where x,y, and z are the ratios you obtained above.
Post your work if you get stuck.

1. 👍 0
2. 👎 0
posted by DrBob222
2. I don't understand how to do any of this stuff. it just goes over my head.

1. 👍 0
2. 👎 0
posted by Becca
3. And you didn't show any work.Your first step is to convert grams to moles and I gave you the formula for that.

1. 👍 0
2. 👎 0
posted by DrBob222
4. 12.7 G Al/ 27 G=0.47
19.7 G N/ 14 G=1.4
67.6 G O/16 G=4.22

0.47/0.47=1
1.4/0.47=3
4.22//0.47=9

AlN3O9

1. 👍 0
2. 👎 0
posted by Havil

## Similar Questions

1. ### Chemistry

It is possible, although less accurate, to do a standard addition with only one sample. An unknown Fe sample was analyzed by AAS and gave an absorbance reading of 0.160. To the same sample we added 1.5ppm Fe and the new absorbance

asked by Ella on March 5, 2012
2. ### Chemistry

It is possible, although less accurate, to do a standard addition with only one sample. An unknown Fe sample was analyzed by AAS and gave an absorbance reading of 0.160. To the same sample we added 1.5ppm Fe and the new absorbance

asked by Mae on March 5, 2012
3. ### CHEMISTRY

A 70g sample of iron ore(Fe2O3) was analyzed for Iron and found to contain 1700 Fe. Calculate the percentage of iron in the sample.

asked by JOSEPH BANDA on January 7, 2017
4. ### Chemistry

A metallurgist decomposes an unknown ore to the following metals. What is the chemical formula of the ore? (Show all the chemical equation and solution steps) ore = x metal products from ore decomposition: Al: 162.0 grams Sb:

asked by jermain 32 on February 2, 2012
5. ### Quantitative Chemical Analysis

assume an unknown sample to be 15% copper, weigh enough dried ore sample to use approximatele 35-45mL of .09M S2O3-. How many grams do I need to measure out to use 40.00mL of the thiosulfate solution?

asked by Jill on September 28, 2012
6. ### Chem

Ores are analyzed by dissolving some of the ore and then performing an analysis of a metal (expressed in grams); usually the concentration of the metal is expressed as % of the amount of the ore (in grams) dissolved. An ore

asked by Mariam on April 7, 2013
7. ### Chemistry

You have 2m^3 of a mineral ore sample. It has a mass of 1x10^4 kg. Calculate the density of the ore sample and express your results in g/cm^3 with appropriate scientific notation.

8. ### AP Chemistry

An ore contains Fe3O4 and no other iron. The iron in a 40.93 gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 30.7 grams. What was the percent Fe3O4 in the

asked by Gabriella on August 30, 2013
9. ### chemistry

An ore contains Fe3O4 and no other iron. The iron in a 65.46 gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 37.9 grams. What was the percent Fe3O4 in the

asked by William on September 7, 2014
10. ### Ap Chemistry

An ore contains Fe3O4 and no other iron. The iron in a 60.67 gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 36.1 grams. What was the percent Fe3O4 in the

asked by Karen on September 6, 2012

More Similar Questions