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# The rate constant for a first order reaction is 2.What will be the concentration of A for $rx_n$ .$A\rightarrow B$ if $[A_o]=1M$

$(a)\;2M\qquad(b)\;e^{-1}M\qquad(c)\;\large\frac{1}{e^2}$$M\qquad(d)\;e^{-4}M Can you answer this question? ## 1 Answer 0 votes K=\large\frac{1}{t}$$ln\large\frac{[A_o]}{[A_t]}$
$2=1ln\large\frac{1}{[A_t]}$
$[A]_t=e^{-2}M$
Hence (c) is the correct answer.