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in this video were going to focus on balancing chemical equations so lets get right into it lets start with a combustion reaction so here we have propane c3h8 plus oxygen gas and thats going to produce carbon dioxide and water now whenever you want to balance a chemical reaction your goal is to make sure that the atoms are equal on both sides of the reaction for this particular combustion reaction we want to balance the carbon atoms first then the hydrogens and then the oxygens will save that for less so notice that we have three carbon atoms on the left side that means we need three carbon atoms on the right side and here we only have one carbon atom in co2 so what we need to do is put a three in front of carbon dioxide so now we have three carbon atoms on both sides so lets move on to the hydrogen atoms notice that we have eight hydrogen atoms on the left side and the only molecule that has hydrogen is water what number do we need to put in front of h2o eight divided by two is