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The reaction is $A (g) \to B (g) + 2 C (g)$ a first order reaction with a rate constant of $2.303 \times 10^{- 3} S^{- 1}$ . Starting with 0.1 moles of ' A ' in a 2 litre essel, find the concentration of A after 301 sec when the reaction is allowed to take place at constant pressure at 300 K.

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0.0125 M

0.025 M

0.05 M

None of these

answer is B.

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Detailed Solution

Half life of reaction is $t_{1 / 2} = 0.693 / k = 250 \sec .$
So after 250 sec concentration become half and remaing concentration is 0.05/2=0.025M.

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