The reaction of hydrogen gas in the presence of oxygen produces water according to the following reaction: H2 + 02 H20 Balance the chemical equation and determine: a) How many moles of 02 will be obtained from 1.26 moles of H20? b) How many moles of H20 will be obtained from 55.7 moles of H2? c) How many moles of 02 will be obtained from 3.40 moles of H2?