Here is an example of how these conversions are done!
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| https://www.chem.tamu.edu/class/majors/tutorialnotefiles/emp2d.gif |
Wednesday, November 11, 2015
Empirical Formulas
Today in class we learned about empirical and molecular formulas. There are a few key differences between the two including the empirical formula has the lowest whole number ratio and it cannot be reduced, where the molecular formula can have a reduction. It is also important to remember that the molecular formula can be the empirical formula. We learned how to find the empirical formula when you're given the percent composition of each element in the compound. When you are given this, you simply convert each percent first into grams (it will be the same exact number) then use the atomic number off of the periodic table to then convert it to moles. Once it has been converted into moles, then you will divide both numbers by the smaller number. If there happens to be a decimal, that decimal will be multiplied to reach a whole number. Remember to multiply the other numbers also by the whole number that got you to that whole from the decimal.
Here is an example of how these conversions are done!
Here is an example of how these conversions are done!
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Thank you Holly for this post, especially the image. I was having trouble understanding when you were supposed to just round and when you had to multiply by a whole number to get another whole number. This clarified things for me in so many different ways, great post.
ReplyDeleteThe picture you have really clarified when to multiply and when to round when finding the empirical formula.
ReplyDeleteHolly, thank you for this post! The way that you really went all out and typed out all of the steps for doing these types of problems made it very easy to understand. Also, the picture of examples that you included made it even easier to follow along with what I was reading. The only other thing that I might've included would've been maybe a link to a website that would explain how to do these problems, just in case someone couldn't understand it just by reading your post. Overall, this is a great post and super helpful when studying for the test.
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