Question

For a reaction $E_a=0$ and $k=3.2\times {10}^8{s}^{-1}$ at 325 K. The value of k at 335 K would be:

• A. $3.2\times {10}^8{s}^{-1}$
• B. $6.4\times {10}^8{s}^{-1}$
• C. $12.8\times {10}^8{s}^{-1}$
• D. $25.6\times {10}^8{s}^{-1}$

Answer 1

The correct option is A $3.2\times {10}^8{s}^{-1}$

$\frac{k_{325}}{k_{335}}=\frac{A{e}^{-E_a/R\times 325}}{A{e}^{-E_a/R\times 335}}$
or $\frac{3.2\times {10}^8{s}^{-1}}{k_{335}}=\frac{e^{-0/R\times 325}}{e^{-0/R\times 335}}or{e}^0=1$
$\therefore K_{335}=3.2\times {10}^{-8}{s}^{-1}$