Lithium nitride reacts with water to produce ammonia and lithium hydroxide accod

Question

Lithium nitride reacts with water to produce ammonia and lithium hydroxide accodring to the equation,

Li3N(s) + 3H2O(l) --> NH3(g) + 3LiOH(aq)

Heavy water is water with the isotope deuterium in place of ordinary hydrogen, and its formula is D2O. The above reaction can be used to produce heavy ammonia, ND3(g), according to the equation,

Li3N(s) +3D2O(l) --> ND3(g) + 3LiOD(aq)

Calculate how many grams of heavy water are rquired to produce 125.0mg of ND3(g). The mass of deuterium, D, is 2.014 g/mol.

Explanation / Answer

Li3N(s) +3D2O(l) --> ND3(g) + 3LiOD(aq)

Moles of ND3=(125)/(14+3*2)

now moles of D2O = 3* moles of ND3

so mass of D2O = 3*125*(20)/(14+3*2)

=375 mg

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