Wednesday
October 1, 2014

Homework Help: chemistry

Posted by Jamie Marie on Thursday, October 29, 2009 at 3:11pm.

How would you find the empirical formula for this... a substance was found by analysis to contain 20% by mass calcium and 80% by mass bromine.


Would it be CaBr2?

This is what I did...

20g Ca * 20 mol Ca/801.56g Ca = .499 mol Ca

80g Br * 80 mol Br/6392.32g Br = 1.001 mol Br

1.001/.499 = 2 so CaBr2


I meant 20g Ca not 50. Sorry! Would that be right? I multiplied 40.078g Ca (which is one mole) times 20 to get 801.56g Ca (mass of 20 moles) and I used the same method to find the mass for 80 moles of Bromine.

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