Answer:
To calculate the rate of reaction, you need to divide the amount of substance produced by the time it took to produce it.
Rate of reaction = Amount of substance / Time
In this case, the plant produced 9 grams of substance in 7 hours.
Rate of reaction = 9g / 7 hours
Calculating this:
Rate of reaction = 1.2857 grams/hour
Rounded to two decimal places, the rate of reaction is approximately 1.29 grams/hour.