2 litres of acetronitrile is accidently spilt in a school lab of dimensions 40x20x10m and most evaporates calculate the ambient concentration of acetonitrile reach assuming that there are no air changes in the lab

I looked up the density of acetonitrile on the Internet and found 720 kg/m^3. Use that to convert 2 L to grams (or kg). Then calculate the volume of the room from the dimensions. concn in the room = kg gas/m^3 or the room.

To calculate the ambient concentration of acetronitrile in the lab, we need to determine the volume of the lab, the volume of the spilled acetronitrile, and then calculate the concentration.

1. Calculate the volume of the lab:
The dimensions of the lab are given as 40x20x10 meters. To find the volume, multiply these dimensions together:
Volume of lab = Length x Width x Height = 40m x 20m x 10m = 8,000 cubic meters

2. Calculate the volume of the spilled acetronitrile:
The spilled acetronitrile is given as 2 liters. However, we need to convert this to cubic meters to match the volume of the lab:
Volume of acetronitrile = 2 liters = 0.002 cubic meters

3. Calculate the remaining volume of acetronitrile after evaporation:
Since it's mentioned that most of the acetronitrile evaporates, we need to assume some percentage of remaining volume. Let's assume 10% remains:
Remaining volume of acetronitrile = 0.002 cubic meters x (100% - 10%) = 0.0018 cubic meters

4. Calculate the concentration of acetronitrile:
Now we can calculate the concentration by dividing the remaining volume of acetronitrile by the volume of the lab:
Concentration of acetronitrile = Remaining volume of acetronitrile / Volume of lab
= 0.0018 cubic meters / 8,000 cubic meters = 2.25 x 10^-7

Therefore, the ambient concentration of acetronitrile in the lab, assuming no air changes, would be approximately 2.25 x 10^-7.