Answer
18 g
Work Step by Step
According to conservation of mass, mass is conserved in every chemical reaction.
To get the mass of the water we subtract the mass of the products from the mass of reactants.
The mass of the reactants is 40 g. The products are 14 g of Nitrogen and 8 grams of Oxygen and Water.
We subtract 8 and 14 from 40 g.
40 - 14 - 8
18 g
