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Question

How many moles of water, can be produced from the reaction of 16 grams of methane with an unlimited supply of oxygen? How many grams of water is this? The reaction is:
CH4 +2 O2 --> CO2 +2 H2O

Answer 1

one mole of methane weights 16 g

the ratio between CH4 and H2O is 1 : 2 so we would get two moles of water

1 mole of water weights 18 g so we get 36 g H2O

Answer 2

you see from the equation that 1 mole of methanecorresponds to the production of 2 moles of water.
The molecular weight of methane is 16 = 1 mole of CH4 so the answer is 2 moles of water