Question

In the following reaction, $A\to B$, rate constant is $1.2\times {10}^{-2}M{s}^{-1}$. What is the concentration of $B$ after $10$ min, if we start with $10M$ of $A$?

• A. 7.2 M
• B. 4.5 M
• C. 6.7 M
• D. 7.0 M

Answer 1

The correct option is A 7.2 M

Unit of k indicates that it's a zero-order reaction.

According to zero-order reaction.

$Rateofreaction=k$

$RateofformationofB=\frac{ConcenterationofB}{time\left(inseconds\right)}=k$
$ConcentrationofBafter10mins=kt=1.2\times {10}^{-2}\times 10\times 60=7.2M$