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NEET2013ChemistryThermodynamics (C)Actual

When 5 litres of a gas mixture of methane and propane is perfectly combusted at 0^ C and 1 atmosphere, 16 litres of oxygen at the same temperature and pressure is consumed. The amount of heat released from the combustion in kJ ( H _ eomb ( CH ₄ ) .=890 ~kJ ~mol ⁻¹, H _ comb ( C ₃ H ₈ )=2220 ~kJ . mol ⁻¹ )

Options

  1. A38
  2. B317
  3. C477
  4. D32 benzyl

Correct answer

B. 317

Step-by-step solution

The chemical and their mole reaction can be expressed as follows aligned CH ₄+2 O ₂ & CO ₂+ H ₂ O C ₃ H ₈+5 O ₂ & 3 CO ₂+4 H ₂ O CH ₄+ C ₃ H ₈ & = 5 22.4 =0.22 moles O ₂ & = 16 224 =0.71 moles 2 x+(0.22-x) 5 & =0.71 x & =0.13 Heat liberated & =0.13 890+0.09 & =316 ~kJ aligned

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