Question

Starting with one mole of a compound X, it is found that the reaction is $\frac{3}{4}$, complete in 1 min. What is the rate constant if the reaction follows first order?

• A. $0.231s^{-1}$
• B. $2.31s^{-1}$
• C. $0.0231s^{-1}$
• D. $2.31\times {10}^{-3}s-1$

Answer 1

The correct option is C $0.0231s^{-1}$

$t_{\frac{3}{4}}=2t_{\frac{1}{2}}=\frac{2\times 2.303}{k}log2k=\frac{2.303}{t_{\frac{3}{4}}}log4=\frac{2.303\times 0.602}{60}k=0.0231s^{-1}$