Answer:
15.4 moles of water
Step-by-step explanation:
When you set up this problem, you will begin with the given information 12.8 moles of oxygen gas. You must get rid of the unit "moles of oxygen gas" and convert it to "moles of water". To do that you are going to use the mole ratio. This comes from the coefficients that are in front of the O2 and H2O formulas. When you set it up you will multiply 12.8 x 6 moles water and divide your answer by 5 moles of oxygen. Watch your sig figs. You have 3 in your given information, so you need 3 in your answer.