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The reaction A(g)toB(g)+2C(g) is a first...

The reaction `A(g)toB(g)+2C(g)` is a first order reaction with rate constant `2.772xx10^(-3)s^(-1)`, Starting with `0.1` mole of A in 2 litre vessel, find the concentration of A after 250 sec when the reaction is allowed to take place at constant pressure and at 300 K?

A

`0.0125 M`

B

`0.025 M`

C

`0.05 M`

D

none of these

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The correct Answer is:
A
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