Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 6.4 g of methane reacts with 25.6 g of oxygen to produce 17.6 g of carbon dioxide?

Question

anonymous · Answer

First write a balanced equation of the reaction so that you can see the mole ratio between the reactants and the products.

anonymous · Answer

Normally when there are they give you the amounts of more than one reactant, it means you need to find a limiting reactant, but since they give you the amount of CO2 produced, you don't need to calculate the amount of mols for methane and oxygen. So, using the grams of carbon dioxide they give you, calculate the number of mols using molar mass of carbon dioxide, and multiply by the mole ratio between carbon dioxide and water. Then you multiply that mole amount of water by the molar mass of water to find grams of water and voila.