The Initial Concentration of an Enzyme Is 5 Moles (Mol) $\mathrm{mol}$

Multiple Choice

The initial concentration of an enzyme is 5 moles (mol) . Twenty seconds into the reaction, only 0.4 $\mathrm{mol}$ of the enzyme remains. Find the rate of change of the enzyme in $\mathrm{mol} / \mathrm{s}$ .

A) $0.23 \mathrm{~mol} / \mathrm{s}$
B) $-0.23 \mathrm{~mol} / \mathrm{s}$
C) $-4.35 \mathrm{~mol} / \mathrm{s}$
D) $4.35 \mathrm{~mol} / \mathrm{s}$