Question

Half life period of a first order reaction, $A\to$ product is $6.93$ hour. What is the value of rate constant?

• A. $1.596h^{-1}$
• B. $0.1h^{-1}$
• C. $4.802h^{-1}$
• D. $10h^{-1}$

Answer 1

The correct option is B $0.1h^{-1}$

We know,

$t_{\frac{1}{2}}=\frac{0.693}{k}$

where $t_{\frac{1}{2}}$ is the half life and $k$ is rate constant.

$t_{\frac{1}{2}}=\frac{0.693}{k}$

$\Rightarrow 6.93=\frac{0.693}{k}$

$\Rightarrow k=0.1h^{-1}$

So the rate constant is 0.1 h${}^{-1}$.