4. Aerosol cans carry a danger warning about incineration. If an “empty” can has

Question

4. Aerosol cans carry a danger warning about incineration. If an “empty” can has enough gas left inside it to produce just 1 atm of pressure at 25 °C, and the can is heated in a camp fire to 1000 °C what will be the pressure inside the heated can? ANSWER IS 4.27 atm

5. Auto air bags inflate by using solid sodium azide to produce nitrogen gas according to the following reaction: NaN3 Na + N2 If an airbag needs 11.8 L of gas at STP to inflate fully, what mass of sodium azide is needed? ANSWER IS 22.8 g of NaN3

Explanation / Answer

4.

   initial                                                              final

P1 = 1 atm                                                       P2 =

T1 = 25+273 = 298K                                         T2 = 1000 + 273 = 1273K

               P1/T1     =   P2/T2

                   P2     = P1T2/T1

                            = 1*1273/298    = 4.27atm >>>>answer

5.    2NaN3 2Na + 3N2

3 moles of N2 produced from 2 moles of NaN3

3*22.4L of N2 produced from 2*65g of NaN3

11.8L of N2 produced from = 2*65*11.8/3*22.4   = 22.8g of NaN3<<<<<<answer

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