heavy water is water Lithium nitride reacts with water to produce ammonia and li

Question

heavy water is water Lithium nitride reacts with water to produce ammonia and lithium hydroxide according to the equation. Li_3N(s) + 3H_2O(l) 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(l) rightarrow ND_3(g) + 3LiOD(aq) Calculate how many grams of heavy water are required to produce 120.0 mg of ND_3(g). The mass of deuterium, D, is 2.014 g/mol.

Explanation / Answer

Molecular mass of D2O = 20 g/mol

Molecular mass of ND3 = 20 g/mol

Given

Mass of ND3 required to be produced = 120 g

No. of molecules of ND3 required to be produced = Mass/ Molecular Mass = 120 g / 20 g/mol = 6 molecules of ND3

3 No of molecules of D2O required to produce 1 molecule of ND3

Hence no of molecules of D2O required to produce 6 molecule of ND3 = 6* 3 = 18 molecules of D2O

mass of D2O required = 18 moles * Molecular mass of D2O = 18 * 20 = 360 g of D2O            Answer 360 g

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