# Natural water contains about 0.02% D2O (heavy water). When it is enriched to 20% (by volume), calculate the fraction of weight due to neutrons in 1 mole of water sample.

Natural water contains about 0.02% D2O (heavy water). When it is enriched to 20% (by volume), calculate the fraction of weight due to neutrons in 1 mole of water sample.

Options: a) 0.355, b) 0.444, c) 0.455, d) 0.500