Wednesday
August 27, 2014

Homework Help: Chemistry

Posted by Chris on Sunday, February 4, 2007 at 3:17pm.

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 of experimental data). That number is the number used to indicate the units of the empirical formula that are hooked together. For example, the molar mass of acetylene is 26. The empirical formula is CH and the empirical formula mass is 13. So, 26/13 = 2.0 which tells me the molecular formula is two units of the empirical formula. Since the empirical formula is CH, then the molecular formula must be (CH)2 or C2H2. If your "number" isn't EXACTLY a whole number, round it so it is. If it is outside the limits I show above, there must be an error in experimental data or the calculation is wrong. I hope this helps.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

chemistry--help - a compound contains 63.15% Carbon, 5.30% hydrogen, 31.55% ...
Chemistry - Let's do 1 and 2 and go from there. I will get you started. Take a ...
Chemistry - Maleic acid is an organic compound composed of 41.39% C, 3.47% H, ...
chem - Citric acid, the compound responsible for the sour taste of lemons, has ...
Chemistry - I need some help with some of these questions: The action of ...
Chemistry - I need some help with some of these questions: The action of ...
chemistry - which of the following compounds contains the lowest percentage by ...
chemistry - How much does 1 molecule of bromine weigh? I know the atomic mass ...
Chemistry - Please check my answers for the following questions. THANK YOU. 1) ...
Chemistry - what is the molecular formula of a compound that is 54.5% C, 9.09% H...

Search
Members