<u>Answer:</u> The amount of CO that is occupied in the room is 
<u>Explanation:</u>
We are given:
Concentration of CO =
by volume
This means that
of CO is present in 1 L of blood
To calculate the volume of cuboid, we use the equation:

where,
V = volume of cuboid
l = length of cuboid = 10.99 m
b = breadth of cuboid = 18.97 m
h = height of cuboid = 11.89 m

Converting this into liters, by using conversion factor:

So, 
Applying unitary method:
In 1 L of blood, the amount of CO present is 
So, in
of blood, the amount of CO present will be = 
Hence, the amount of CO that is occupied in the room is 