500
Where are the fire extinguishers in our lab located...
A) in the center of the lab, since that is where fires will probably occur
B) by the doors, so a safe exit can be made after using the extinguishers
C) next to the fume hoods, because volatile chemicals are dispensed there
D) in a random fashion throughout the lab
B) by the doors, so a safe exit can be made after using the extinguishers