Question

Please help i’m lost

Answer 1

Answer:

73.49 atm

Explanation:

The balance chemical equation is as follow,

   C₃H₈ + 5 O₂  →  3 CO₂ + 4 H₂O

Given Data:

Temperature  =  T = 373 K

Volume  =  V  =  2.5 L

Gas Constant  =  R  =  0.0821 atm.L.mol⁻¹.K⁻¹

To find:

Pressure: P = ?

Formula:

P V = n R T

P = n R T / V

Here we also need to find number of mole,

According to balanced equation,

 1 mole of C₃H₈ on combustion gives  =  3 moles of CO₂

So,

2 moles of C₃H₈ on combustion will give  =  X moles of CO₂

Solving for X,

X  =  2 moles of C₃H₈ × 3 moles of CO₂ ÷ 1 mole of C₃H₈

X =  6 moles of CO₂

Moles  =  n  =  6 mol  

Solution:

P = 6 mol × 0.0821 atm.L.mol⁻¹.K⁻¹ × 373 K ÷ 2.5 L

 P =  73.49 atm