Automotive air bags inflate when a sample of sodium azide, NaN3, is very rapidly decomposed. 2NaN3 --> 2Na + 3N2

What mass of sodium azide is required to produce 73.6 L of nitrogen gas with a density of 1.25 g/L?

i'm assuming that the correct answer is indeed the first one/ "a"..

answer///carbon;

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol