Hello people...could u help me pls...coz i am rly stuck in these thing like calculations...i know all right answers but i am not too sure how to get them...please if somebody of us has a few minutes could u help me with that? Thank you very much. Azides are compounds of nitrogen , used mainly as detonators in explosives. However , sodium azide , NaN3 , decomposes non-explosively on heating to release nitrogen gas. This provides a convenient method of obtaining pure nitrogen in the laboratory. 2NaN3 (s) ---> 2Na (l) + 3N2 (g) 1., A student prepared 1.80 dm3 of pure nitrogen in the laboratory by this method.This gas volume was masured at room temperature and pressure (r.t.p). (i) how many moles of nitrogen , N2 , did the student prepare? - assume that 1 mole of gas molecule occupies 24.0 dm3 at r.t.p. 1 mol of gas molecule = 24.0 dm3 1.80 dm3 / 24 dm3 = 0.075 moles of nitrogen (ii) What mass of sodium azide did the student heat? 2., After cooling , the student obtained 1.15 g of solid sodium.She then carefully reacted this sodium water to form 25.0 cm3 of aqueous sodium hydroxide: 2Na (s) + 2H2O (l) ---> 2NaOH (aq) + H2 (g) Calculate the concentration , in mol dm-3 , of the aqueous sodium hydroxide.