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1. 1.
Most modern cars are fitted with airbags. These work by decomposing sodium azide to liberate nitrogen gas, which inflates the bag.
2NaN3 3N2 + 2Na

A typical driver’s airbag contains 50 g of sodium azide.
Calculate the volume of nitrogen this will produce at room temperature.

A 9.2 dm3

B 13.9 dm3

C 27.7 dm3

D 72.0 dm3

2.What is the number of molecules in 500 cm3
of oxygen under room conditions?
A 1.25 x 1022

B 1.34 x 1022

C 3.0 x 1022

D 3.0 x 1026

( 22 = Power of 10)

Thanks =D
2. For the first one, calculate the number of moles of sodium azide using its molecular weight. From the equation, you can see that you produce one and a half moles of nitrogen gas for each mole of NaN3. Then simply remember that one mole of an ideal gas takes up 22.4 litres and bob's your uncle!
3. For the first one:Number of mole NaN3 =50/{23 (14×3)} =0.7692 molRatio is 2:3Therefore Number of mol N2 = 3/2 × 0.7692 = 1.1583 molVolume of N2 = 1.1583 ×24 = 27.7 dm^3 Answer is C

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