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Grade: 12th pass
        
The heat liberated on complete combustion of 7.8 g benzene is 327 kj. This heat has been measured at constant volume and pressure and at 27* C.Calculate the heat of combustion.at constant pressure
one year ago

Answers : (1)

Piyush Kumar Behera
385 Points
							
C6H6 + 15/2 O------> 6 CO2 + 3H2O
Heat liberated on complete combustion of 7.8 g or benzene = 327 kJ
∴Heat liberated on complete combustion of 78 g (1mol) of benzene = 327 kJ  
Δn = 6-7 ½ = -1.5  
  R = 8.3 × 10 kJ mole K  
  T = 300 K
ΔH = ΔE + ΔngRT;   
    = -327kJ + (-1.5) (8.314 × 10 ) (300) kJ mole-1                 
-327 -3.7413 = 330.7413 KJ 
So the answer is 330.7413
one year ago
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