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

Question

Lithium nitride reacts with water to produce ammonia and lithium hydroxide according 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 required to produce 145.0 mg of ND3(g). The mass of deuterium, D, is 2.014 g/mol.

____________________g D2O

Explanation / Answer

first step: Calculate the molecular weight

ND3: N=1x14=14 .............D=3x2.014=6.042......... total=20.042gr/mol

D2O: D=2x2.014=4.028..............O=1x16=16...........total=20.028gr/mol

according rolling: 3mol of D2O produce 1mol of ND3, then, 60.084gr of D2O -->20.042gr of ND3

gr D2O=(0.145gr ND3)*(60.084gr D2O/20.042gr ND3)

finally, are required 0.435 grams of heavy water.

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