Given the incomplete equation for the combustion of ethane, #2C_2H_6 + 7O_2 -> 4CO_2 + 6__#, what is the formula of the missing product?
In general any organic compound, when burned will generate an "oxide" of its atoms.
Carbon goes to
Hydrogen goes to
Nitrogen and Sulfur depend on the amount of
Another way to solve this is to count the atoms that aren't in the right side. If you do the math you'll see we're missing 12 Hydrogen atoms and 6 Oxygen atoms, dividing by the stoichiometric coefficient that was given, we have 2 Hydrogen atoms and 1 Oxygen atom together to make a compound, which is obviously water.