Chemical Reaction with density?

Question

I was given the equation: NaN3 --> Na2 + N2, which I balanced to:
2NaN3 --> 2Na2 + 3N2 (I hope that is correct)

a) Determine the number of grams of N2 are produced by the decomposition of 1.50 moles of NaN3 

b) How many grams of NaN3 are required to form 5.00g of nitrogen gas? 
c) How many grams of NaN3 are required to produce 5.0ft^3 if the gas has a density of 1.25g/L

Answer 1

The decomposition of sodium azide (NaN₃) is not as you have written it. It is

2NaN₃ => 2Na(s) + 3N₂(g)

a) 1.5 moles NaN₃ x 3mol N2/2 mol NaN3 x 28g/mol N2

 

b) 5g N2 x 1 mol N2/28g x 2 mol NaN3/3 mol N2 x 65g/mol NaN3

 

c) Convert 5 cubic ft to liters using 1 cubic ft = 28.3 liters. Convert this to grams using density. 1.25 g/L x Liters = g

Convert to moles of N2 then find moles NaN3 using stoichiometry and then grams using molar mass.