text: for the reaction? ch4   +   o2   →   co2   +   h2o    how many moles of   h2o   are produced from the complete reaction of   4.26 moles   of   ch4 ? first, balance the equation: ch4 + 2 o2 -> co2 + 2 h2o  use the coefficients to find the mole ratio... for every 1 mole ch4 that reacts, 2 moles of h2o will be produced  therefore,   4.26 x 2 = 8.52 moles of h2o are produced