In a reaction involving one single reactant, the fraction of the reactant consumed may be defined as \[f=\left[ 1-\left( C/{{C}_{0}} \right) \right],\] where \[{{C}_{0}}\] and C are the concentrations of the reactant at the start and after time t. For a first-order reaction:

\[\frac{df}{dt}=k\left( 1-f \right)\]

\[-\frac{df}{dt}=k\left( 1-f \right)\]

In a reaction involving one single reactant, the fraction of the react

1.	In a reaction involving one single reactant, the fraction of the reactant consumed may be defined as \[f=\left[ 1-\left( C/{{C}_{0}} \right) \right],\] where \[{{C}_{0}}\] and C are the concentrations of the reactant at the start and after time t. For a first-order reaction:
A.	\[\frac{df}{dt}=k\left( 1-f \right)\]
B.	\[-\frac{df}{dt}=kf\]
C.	\[-\frac{df}{dt}=k\left( 1-f \right)\]
D.	\[\frac{df}{dt}=kf\]
Answer» B. \[-\frac{df}{dt}=kf\]

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In a reaction involving one single reactant, the fraction of the reactant consumed may be defined as \[f=\left[ 1-\left( C/{{C}_{0}} \right) \right],\] where \[{{C}_{0}}\] and C are the concentrations of the reactant at the start and after time t. For a first-order reaction:

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