The concentration of carbon monoxide in an urban apartment is 48 μg/m3. what mass of carbon monoxide in grams is present in a room measuring 11.5 × 12.0 × 20.5 ft?

The dimensions of room are  .  Thus, volume of room will be:

Converting to

Since,

Thus,

Now, concentration of carbon monoxide in the urban apartment is , thus, mass of carbon monoxide can be calculated as follows:

Rearranging,

Putting the values,

converting

Since, thus,

Therefore, mass of carbon monoxide present in the room is .

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds