Question

1. 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.

Answer 1

For 1 mole water the mass is = 18 g

 

For 1 mole D2O the mass is = 20 g

 

If both are present in 50/50 amount

 

mass = (18 + 20)/2 = 38/2 = 19 g