Question

Automotive air bags inflate when a sample of sodium azide, , is very rapidly decomposed. What mass of sodium azide is required to produce 2.6 ft (73.6 L) of nitrogen gas with a density of 1.25 g/L?

Answer 1

sodium azide required = 142.4 g

Step-by-step explanation:

Decomposition of sodium azide .

2NaN₃ = 2Na + 3 N₂

2 mole 3 mole of nitrogen

2 moles of sodium azide gives 3 moles of nitrogen

mol weight of sodium azide = 65

mol weight of nitrogen = 28

2 x 65 g of sodium azide gives 3 x 28 g of nitrogen .

130 g of sodium azide gives 84 g of nitrogen .

mass of nitrogen required = 1.25 x 73.6

= 92 g

84 g of nitrogen requires decomposition of 130 g of sodium azide

92 g of nitrogen requires decomposition of 130x 92 / 84 g of sodium azide

sodium azide required = 130x 92 / 84 = 142.4 g