# 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?

Jan 6, 2016

${H}_{2} O$, aka water.

#### Explanation:

In general any organic compound, when burned will generate an "oxide" of its atoms.

Carbon goes to $C O$ or $C {O}_{2}$ (the latter, if complete)
Hydrogen goes to ${H}_{2} O$
Nitrogen and Sulfur depend on the amount of ${O}_{2}$ available. If the amount is big enough they'll go for higher oxidation states such as $N {O}_{2}$, $S {O}_{3}$ but with less oxygen they'll settle for lower states like $N O$ and $S {O}_{2}$

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.