$Sodium azide$ $"Sodium azide"$ , $N a N_{3}$ $NaN_3$ , is used in automobiles to fill air bags: (i) is this an example of chemical change; (ii) is the mass of the products equal to the mass of the reactants; and (iii) could a $83.0 \cdot g$ $83.0g$ sodium azide give rise to a volume of $36 \cdot L$ $36L$ ?

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$Sodium azide$ $"Sodium azide"$ , $N a N_{3}$ $NaN_3$ , is used in automobiles to fill air bags: (i) is this an example of chemical change; (ii) is the mass of the products equal to the mass of the reactants; and (iii) could a $83.0 \cdot g$ $83.0g$ sodium azide give rise to a volume of $36 \cdot L$ $36L$ ?

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Answer 1 · 2017-12-28T16:53:54

Yes, yes, yes....

Explanation:

So we gots....

$2 N a N_{3} (s) \to 2 N a (s) + 3 N_{2} (g)$ $2NaN_3(s) rarr 2Na(s) + 3N_2(g)$

We could separate this reaction out into half equations...

$underbrace(Na^(+) + e^(-) rarr Na(s))_"reduction half equation"$ $(i)$

$underbrace(N_3^(-) rarr 3/2N_2(g)+ e^(-) )_"oxidation half equation"$ $(ii)$

And so we add $(i)$ and $(ii)$ in the usual way to eliminate the electrons....

$NaN_3(s) rarr 3/2N_2(g) + Na(s)$

And so we start with a solid reagent, the nitride salt, and electrical ignition gives rise to A GASEOUS PRODUCT...i.e. dinitrogen....and each $83*g$ mass of sodium nitride gives rise to a volume of approx. $36*L$ dinitrogen, that inflates the bag, and hopefully cushions your nut when it strikes the steering wheel...

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