December 3rd, 2016, 11:18 AM  #1 
Member Joined: Sep 2016 From: zambia Posts: 31 Thanks: 0  Empirical formula
I need help with the following question. I don't know where I am making a mistake in the calculations. The answer I am getting is C3H4O4 which is wrong N.B The numbers in the formula CHO are subscripts. QUESTION A compound contains carbon, hydrogen and oxygen. Combustion of 10.68 mg of the compound yields 16.01 mg of carbon dioxide and 4.37 of water. The molar mass of the compound is 176.1 g/mol. What is the empirical formula of the compound? Last edited by skipjack; December 3rd, 2016 at 11:25 AM. 
December 3rd, 2016, 12:29 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,962 Thanks: 1606 
Suppose the combustion reaction is $\text{C}_6\text{H}_8\text{O}_6 + 5\text{O}_2 = 6\text{CO}_2 + 4\text{H}_2\text{O}$... the description doesn't clarify whether that extra oxygen is allowed, but I'm assuming that it is.


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