Sodium azide, a compound containing only sodium (Na) and nitrogen(N), is used as

Question

Sodium azide, a compound containing only sodium (Na) and nitrogen(N), is used as a propellant for inflating airbags in someautomobiles. A sample of sodium azide was weighted into acrucible. The crucible was covered and heated until only Naremained. The crucible was then cooled and reweighed. The following data were collected.

Mass of crucible and cover, g 28.887
Mass of crucible, cover, and sodium azide, g 30.354
Mass of crucible, cover, and Na,g       29.406

(1) Determine the empirical formula of sodiumazide?

Explanation / Answer

Mass of crucible and cover, = 28.887 g
Mass of crucible, cover, and sodium azide, = 30.354 g So Mass of sodium azide = 30.354 g - 28.887 g                                        =1.467 g
Mass of crucible, cover, and Na, = 29.406 g
So Mass of Na = 29.406 g - 28.887 g                         =0.519 g So mass of Nitrogen = Mass of sodium azide - Mass of Na                                 =1.467 g - 0.519 g                                 =0.948 g Moles of Sodium = Mass / atomic mass                            =0.519 g / 23 g/mol                            =0.0225 moles Moles of nitrogen = 0.948 g/ 14 g/mol                            =0.067 moles Dividing both the moles by 0.0225, we get the empiricalformula as Na N3
            

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