Question

How much NH,Cl is needed to prepare 10 litres ammonia at STP ?
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Answer 1

Well, depending on the syllabus, STP specifies 273.15 K and 100 kPa, and a mole of Ideal gas expresses a volume of 22.7 L under these conditions. And so we need 0.441 mol ammonia, and thus 0.441 mol ammonium chloride, a mass of 23.6 g. Of course we would need to liberate the ammonia by treatment with base and then heating the solution.

NH4Cl(aq)+NaOH(aq)→NaCl(aq)+H2O(l)+NH3(g)↑