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What I did was find the number of grams of Carbon and Hydrogen that are produced by using their respective percents. Then I subtracted those numbers from the total produced to get the number of grams of O in the original. I thought that the LCM(cons. of mass) allowed me to do this, but I don;'t think that it is right--can someone please help me figure out how to do this(BTW, the answer I got was C3H8O)