April 20, 2015

Homework Help: General Chemistry I

Posted by Emily on Monday, December 3, 2012 at 2:50pm.

A sample of a compound containing only Br and O reacts with an excess of H2 to give 6.601 g of HBr and 3.919 g of H2O. What is the empirical formula of this compound?

a. BrO
b. BrO2
c. Br2O
d. BrO3
e. None of the above

I already know the answer is (e), but I am not entirely sure how this answer is reached. Please correct me if I am wrong in any of my calculations:

____ + H2 --> HBr + H2O

(the space is the unknown compound)

6.601 g * (1 mol/80.9119 g) * (1 mol Br/1 mol HBr) = .0815 mol Br

3.919 g * (1 mol/18.0148 g) * (1 mol O/1 mol H2O) = .2175 mol O

This was as far as I got while it still made sense; as I continued I got some outrageous answer like Br19O50. Any help on figuring this out is greatly appreciated!

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