Molar mass
C₃H₈ = 44.0 g/mol
CO₂ = 44.0 g/mol
C₃H₈ + 5 O₂ = 3 CO₂ + 4 H₂O
44.0 g ( C₃H₈) ---------------> 3 x 44.0 g ( CO₂)
mass g (C₃H₈) --------------> 346 g CO₂
mass propane = 346 x 44.0 / 3 x 44.0
mass propane = 15224 / 132
= 115.33 g
hope this helps!
