first

second

The reaction $2N{O}_2$longrightarrow$2NO+O_2$ has the rate constant $k=0\mathrm{.}63M^{-1}{s}^{-1}.$

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Correct

Part B

If the initial concentration of $N{O}_2$ is $6\mathrm{.}20{10}^{-2}M,$ how would you determine how long it would take for the concentration to decrease to $3\mathrm{.}00{10}^{-2}M?$

Express your answer using two significant figures.

$\sqrt[]{}A$

$x^a{x}_b,\frac{a}{h}\sqrt[\phantom{2}]{x}\sqrt[n]{x}$vec$(x),$hat$(x),|x|$

$x*{10}^n$