Answer:
The answer to your question is 0.186 moles  of CO₂
Step-by-step explanation:
Data
Volume = 2.7 L
Temperature = 24°C
Pressure = 57.2 kPa
moles of CO₂ = ?
Process
1.- Calculate the moles of Propane, use the ideal gas formula
           PV = nRT
           n = PV / RT
- Convert temperature to °K           
   °K = 273 + 24 = 297
- Convert pressure to atm
           1 atm ----------------- 101325 Pa
           x       ------------------  57200 Pa
           x = (57200 x 1)/101325
           x = 0.56 atm
- Substitution
          n = (0.56)(2.7) / (0.082)(297)
- Simplification  
           n = 1.512 / 24.354
- Result 
           n = 0.062 moles
2.- Balanced the chemical reaction
                   C₃H₈  +  5O₂   ⇒    3CO₂  +  4H₂O
3.- Calculate the moles of Carbon dioxide
                  1 moles of C₃H₈  ------------------ 3 moles of CO₂
                  0.062 moles      -------------------   x
                  x = (0.062 x 3) / 1
                  x = 0.186 moles