Question

A car airbag requires 70.0L of nitrogen to inflate properly. How much sodium azide (NaN3) is needed to generate the proper amount of nitrogen gas to fill the air bag?2NaN3=2Na+3N2(Performed at STP)

Answer 1

Explanation:

First we need to know that the molar volume of any gas at STP is 22.4 L/mol.

So first let's transform 70 L of nitrogen into moles:

22.4 L --- 1 mol

70 L ---- x mol

x = 3.125 moles of N2

Now let's use the equation ratio to find out the quantity in moles of NaN3:

2 moles of NaN3 ---- 3 moles of N2

y moles of NaN3 ---- 3.125 moles of N2

y = 2.08 moles of NaN3

Let's transform it into grams:

m = n*MM

MM of NaN3 = 65 g/mol

m = 2.08*65

m = 135.4 g

Answer: It is needed 2.08 moles of NaN3 or 135.4 g of it.