Answer: There are 32400 moles of propane burned.
Explanation:
To calculate the mass of propane, we use the equation:

Density of propane = 
Volume of propane = 750 gal
Putting values in above equation, we get:
(1 lb=453.6 g[/tex]
According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number
of particles.
To calculate the moles, we use the equation:

Thus there are 32400 moles of propane burned.