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The first order liquid phase reaction A $\rightarrow$ P is conducted isothermally in a plug flow reactor of 5 liter volume. The inlet volumetric flow rate is 1 liter/min and the inlet concentration of A is 2 mole/liter.

If the exit concentration of A is 0.5 mole/liter, then the rate constant, in min$^{-1}$, is

- 0.06
- 0.28
- 0.42
- 0.64