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NEET2015ChemistryThermodynamics (C)Actual

The heat of combustion of carbon to C O 2 is   - 393 . 5   kJ / mol . The heat released upon the formation of 35 . 2   g of C O 2 from carbon and oxygen gas is

Options

  1. A- 315 k J
  2. B+ 315 k J
  3. C- 630 k J
  4. D- 3.15 k J

Correct answer

A. - 315 k J

Step-by-step solution

Formation of C O 2 from carbon and dioxygen gas can be represented as C s + O 2 ( g ) → C O 2 ( g )   ; ∆ f H = - 393.5   k J   m o l - 1 ( 1   mole = 44   g ) The heat released on formation of 44   g C O 2 = - 393.5   k J   m o l - 1 = - 393.5   k J   m o l - 1 44   g × 35.2   g = - 315   k J

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