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AP EAMCET201920 Apr 2019Morning ShiftChemistryChemical KineticsActual

In the first order thermal decomposition of ( C ₂ H ₅ I ( g ) C ₂ H ₄(g)+ HI (g) ), the reactant in the beginning exerts a pressure of 2 bar in a closed vessel at (600 ~K ). If the partial pressure of the reactant is 0.1 bar after 1000 minutes at the same temperature the rate constant in ( ⁻¹ ) is (( 2=0.3010) )

Options

  1. A(6.0 10^4 )
  2. B(60 10⁻³ )
  3. C(3.0 10^3 )
  4. D(3.0 10⁻¹ )

Correct answer

C. (3.0 10^3 )

Step-by-step solution

( array lccr & C ₂ H ₅ I & C ₂ H ₄(g) & + HI (g) At t=0 & 2 bar & 0 & 0 array ) ( array cc After 1000 minutes 0.1 & (2-0.1) & (2-0.1) & =1.9 & =1.9 array ) Since, the reaction is first order, ( aligned k & = 2.303 t p p₀-x k & = 2.303 1000 2 2-1.9 & = 2303 1000 20 k & =3 10⁻³ ~min ⁻¹ aligned )

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