Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:
2nan3 (s) → 2na (s) + 3n2 (g)
how many moles of n2 are produced by the decomposition of 1.25 mol of sodium azide?
a) 4.32
b) 8.64
c) 1..e2
d) 1.44
e) 0.960

1.875 moles of N₂ produced from 1.25 moles of sodium azide.

Explanation:

Given data:

moles of sodium azide = 1.25 mol

moles of N₂ produced = ?

Balance chemical equation:

2NaN₃(s) → 2Na(s) + 3N₂(g)

Now we compare the moles of sodium azide and N₂ from balance chemical equation,

                          NaN₃   :    N₂

                              2      :      3

                            1.25   :      3/2×1.25  = 1.875

1.875 moles of N₂ produced from 1.25 moles of sodium azide.

thats how its supposed to be