Chemistry question help.

Please could you help me on the following question:
One method used to inflate air bags in cars is to use nitrogen produced chemically from the decomposition of sodium azide:
2NaN3(s) = 2Na(s) +3N2(g) (equation 1)
The sodium formed reacts with potassium nitrate to give more nitrogen:
10Na + 2KNO3(s) = K2O(s) +5Na2O(s) + N2(g) (equation 2)

a) In what ratio (by mass) must the sodium azide and potassium nitrate be mixed in order that no metallice sodium remains after th reaction.

b) Calculate the total mass of the solid mixture needed to inflate a 60dm^3 air bag at room temperature and atmospheric pressure.

Reply 1

Kozmo

Not sure on the first part of the question, but for the second you can use the ideal gas equation: PV = nRT

Note: be careful with the 60dm^3, the unit for volume in the ideal gas equation is m^3.