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What is the correct stoicheometric ratio b/w NaN3 and KNO3 to ensure no sodium is unreacted? What would be the consequences of an excess of KNO3 to the operation of an airbag?

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Delmaghanidn
2KNO3 + heat ==> 2KNO2 + O2 
So if KNO3 is in excess and it's just popped out of the inflated bag and nothing else happens, then I don't think the KNO3 would have a damaging effect. However, as we all know, in accidents, many things can happen. IF the temperature goes up(for example, a fire starts (not all that unusual), then the KNO3 could produce oxygen and we certainly don't want any excess oxygen around with a fire. 
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