Answer : The mass of combustion products formed are 134 lbs.
Explanation :
The balanced chemical reaction will be:

Given :
Mass of 
 = 29 lbs = 13154.2 g
conversion used : 1 lbs = 453.592 g
Molar mass of 
 = 44 g/mole
First we have to calculate the moles of 
.

Now we have to calculate the moles of 
 and 
.
From the balanced chemical reaction we conclude that,
As, 1 mole of 
 react to give 3 moles of 
So, 298.9 mole of 
 react to give 
 moles of 
and,
As, 1 mole of 
 react to give 4 moles of 
So, 298.9 mole of 
 react to give 
 moles of 
Now we have to calculate the mass of 
 and 
.
Molar mass of 
 = 44 g/mole
Molar mass of 
 = 18 g/mole


and,


The total mass of products = Mass of 
 + Mass of 
The total mass of products = 86.98 + 47.44 = 134.42 ≈ 134 lbs
Therefore, the mass of combustion products formed are 134 lbs.