Wednesday
July 30, 2014

Homework Help: Chemistry

Posted by Anonymous on Thursday, April 22, 2010 at 1:58pm.

Calculate the empirical formula and molecular formula of a compound that contains only carbon, oxygen and hydrogen and has a molecular mass of approximately 90. g/mol. Upon combustion of 12.0g of the compund with an excess of oxygen, the yield was 1.2 g of water and 5.87 of carbon dioxide.

I tried to set the equation like this

12.0 --> 1.2 H2O + 5.87 CO2
but it said "with an excess of oxygen" and I was confuse on that...

I know how to find the molecular mass but in here it says 90. g/mol not just regular 90 grams, I don't know what to do with it. Do i have to change it to just grams or something? or just leave it.. also there was another problem similar to this. the molecular mass is "approximately 150 g/ml."

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