Chemistry Homework Help

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The only method I know is to assume that you have a 100 gram sample, so you have: 
14.3g H, and 85.7gC 

convert these to moles 

14.3g H (1 mol H/1.01g H) = 14.16 
85.7g C (1 mol C/12.01g C) = 7.135 

To find the ratio between atoms, divide all of your components (in this case you only have two) by the lowest number of moles. So 

14.16/7.135 =~ 2 
7.135/7.135 = 1 

Now you know your empirical formula is CH2. You know that the molar mass is 42.00g, so divide this by the molecular weight of CH2 

42/14.03 =~ 3 

Since you know how many times larger the molecular formula is than the empirical, you can multiply your empirical number by three to get the molecular formula, C3H6

Please let me know if you nea case for torture by michale levined any clarification. I'm always happy to answer your questions.

qhvatchat (540)
Cornell University

Just what I was looking for! Super helpful.