# chemistry

calculate the empirical formula: 79.8%C and 20.2%H. what os the formula

Take a 100 g sample. That will give you
79.8 g C
20.2 g H.

convert g to mols. mols = g/molar mass.
79.8/12.01 = 6.64
20.2/1 = 20.2

This gives the formula of
C6.64H20.2

However, we know from Dalton's theory that atoms combine in the ratio of small whole numbers. So convert the above values into small whole numbers. Hint: Divide the smaller number by itself; that will make it be 1.000. Then divide the other number by the same value. That is an easy way to convert to small whole numbers.

1. 👍 0
2. 👎 0
3. 👁 178

## Similar Questions

1. ### chemistry

A compound has the following composition. C 54.5%, H 9.10% and 0 36.4% its molecular weight is 88.10. Determine its empirical formula and molecular formula. Take 100 g sample. That gives you 54.5 g C, 9.10 g H and 36.4 g O. Now

asked by Brooke on June 24, 2007
2. ### Chemistry (Check)

Classify each of these statements as always true, sometimes true, or never true. 7____AT____It is necessary to know the formula of a compound in order to calculate its percent composition. 8___ST_____If the percent by mass of

asked by Bryan on February 11, 2007
3. ### Chemistry

If you divide the molar mass of a compound by the empirical formula mass, what is the result? That division should be VERY close to a whole number. Usually, 0.9 to 1.1 or 1.9 to 2.1 (all depending upon the accuracy and precision

asked by Chris on February 4, 2007
4. ### chemistry

1.to calculate the percent by massof an element in a known compound, divide the mass of the element in one mole by the _______and multiply by 100%. A(n) _______formula represents the lowest________ratio of the elements in a

asked by Anonymous on March 24, 2009
5. ### chemistry

How do I find the empirical formula for aluminium selenide? You have to have some data, such as masses, or percent: Empirical means it was measured. The empirical formula for aluminium selenide is the same as it's molecular

asked by Mac on January 6, 2007
6. ### chemistry

A compound is found to be 51.39% carbon, 8.64% hydrogen, and 39.97% nitrogen. It has a molecular molar mass of 140.22 g/mol. (This question requires one to find the empirical formula to end up with the final answer in molecular

asked by spartan on January 10, 2019
7. ### Chemistry

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40

asked by Matthew on February 20, 2012
8. ### Chemistry

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40

asked by Matthew on February 20, 2012
9. ### 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

asked by anonymous on August 2, 2007
10. ### Chemistry

I'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon

asked by Lina on January 16, 2016
11. ### Chemistry Really Confused!!

'm confused on how to set up the problem for each question.. 1.) Calculate the empirical formula of a compound if a 6.21 g sample contains 1.67g of cerium and the remainder iodine 2.) An unknown compound contains 85.64% carbon

asked by Lina on January 16, 2016

More Similar Questions