A student investigated the rate of a zero-order esterification reaction. They measured the concentration of the ester product at regular intervals during the first few hours of the reaction.
Figure 1 shows the line of best fit drawn through the student's results.
a.[3]
Determine the gradient of the line of best fit in Figure 1.
Use the equation: Gradient=Change in concentration of esterChange in time\text{Gradient} = \frac{\text{Change in concentration of ester}}{\text{Change in time}}Gradient=Change in timeChange in concentration of ester
Give the unit.
b.[1]
The initial concentration of the ester product (at t=0 hourst = 0\text{ hours}t=0 hours) is where the line of best fit meets the y-axis. Determine this initial concentration.