In this lesson, we will learn how to plot concentration–time data for first-order reactions to calculate the rate constants and initial concentrations.

Q1:

The concentration of a reactant A was monitored during the course of a reaction. The data were plotted on a graph of lnA[] against time. If the reaction is first order with respect to A, what is the initial concentration of A in terms of the gradient of the plot 𝑚 and the 𝑦-intercept 𝑐?

Q2:

The concentration of a reactant A was monitored during the course of a reaction. The data were plotted on a graph of lnA[] against time. If the reaction is first order with respect to A, what is the rate constant of the reaction in terms of the gradient of the plot 𝑚 and the 𝑦-intercept 𝑐?

Q3:

Compounds A and B react according to the following equation: A+BC The reaction is first order with respect to A, and B is in large excess. Which function of the reaction rate 𝑅 varies linearly with the reaction time?

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