Answer: The chemistry class will last for 2400 seconds.
Step-by-step explanation:
We are given:
Time of chemistry class = 40.0 minutes
To convert the given time into seconds, we use the conversion factors:
1 min = 60 seconds
Converting the time into seconds, we get:
![\Rightarrow(40.0min)* ((60sec)/(1min))=2400sec](https://img.qammunity.org/2020/formulas/chemistry/middle-school/nklsdcvcyuftr1ev37kqny2xg50rctmv9t.png)
Hence, the chemistry class will last for 2400 seconds.