Question

If a room had a formaldehyde concentration of 0.63 ppm at 1.00 atm and 25^oC, how many milligrams of formaldehyde would be in the room if it had a width of 4 meters, a height of 2.3 meters and length of 5.5 meters? Give the answer in mg so you can enter a reasonable number without scientific notation.

Answer 1

Given that the concentration of formaldehyde in a room is 0.63 ppm

We know that 1 ppm means 1mg in 1000 mL (1L) of volume.

Therefore 0.63 ppm means 0.63 mg in 1L volume.

Now the room dimensions are width=4 meters

Height=2.3meters, length=5.5 meters.

So the volume of room =length x width x height

V=5.5m x 4m x 2.3m=50.6 m3.

We know that 1m3=1000 L

Volume of room V=50.6x1000L=50600 L.

In 1L volume we have 0.63 mg of formaldehyde, so for 50600 L room contains how much mg of formaldehyde?

=(0.63 mg x 50600 L)/1L=31878 mg.

The amounnt of formaldehyde =31878 mg.