Question

The half-life of a zero-order reaction is 30 minutes. What is the concentration of the reactant left after 60 minutes?

• A. $25$
• B. $50$
• C. $6.25$
• D. $0$

Answer 1

The correct option is D $0$

Its a Zero Order Reaction

$t_{1/2}=\frac{\left[A_0\right]}{2k}$

$k=\frac{\left[A_0\right]}{60}$

$k=\frac{\left[A_0\right]-\left[A\right]}{t}$

Substituting the value of k, we get

$\left[A_0\right]=\left[A_0\right]-\left[A\right]$

$\left[A\right]=0$