Posted by Nikki on Saturday, November 17, 2012 at 6:15am.
Use PV = nRT to solve for n = number of mols. Then n = grams/molar mass. You know grams and n, solve for molar mass.
Take 100 g sample which gives
13.068 g C
86.932 g Br.
Convert grams to mols
mols C = 13.068/atomic mass C.
mols Br = 86.932/atomic mass Br.
Find the ratio of C to Br with the smaller value being 1.00. The easy to do this is to divide the smaller value by itself; divide the other number by the same small number to find empirical formula which will be CxBry.
empirical mass x z = molar mass(from above)
Solve for x which becomes
(empirical formula)x = molecular formula.
Post your work if you get stuck.
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