Propane and oxygen react according to the equation C_3H_8(g) + 5O_2(g) -> 3CO_2(g) + 4H_2O(g). How many grams of water can be produced from the complete combustion of 2.0 moles of C_3H_8(g)?

Since the molar mass of water $M \left({H}_{2} O\right) = 2 \times 1 + 16 = 18 g / m o l$
2 mol propane will generate $2 \times 4 \times 18 = 144 g$ of water