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, Li_3N(s) + 3H_2O(I) rightarrow NH_3(g) + 3LiOH(aq) Heavy water is water with the isotope deuterium in place of ordinary hydrogen, and its formula is D_2O. The above reaction can be used to produce heavy ammonia. ND_3(g), according to the equation. Li_3N(s) + 3D_2O(I) rightarrow ND_3(g) + 3LiOD(aq) Calculate how many grams of heavy water are required to produce 450.0 mg of ND_3(g). The mass of deuterium, D, is 2.014 g/mol.

Explanation / Answer

Li3N + 3D2O ----------> ND3 + 3LiOD

From the equation

3 moles of D2O can give one moles of ND3

3x 20.028g/mol can give 1x 20.042 g of ND3

? can give 450.0g of ND3

= 3x20.028 x450.0 /20.042

= 1349.0569 g

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