[Jzar89]

Hello I just have one last question from my homework which is due at 6pm today(friday)

Here is the question:

The environmental protection agency (EPA) has proposed a new standard for microparticulates in air: For particles up to 2.5 μm in diameter, the maximum allowable amount is 50 μg/m^3. If your 9.7 ft × 9.6 ft × 10 ft dorm room just meets the new EPA standard, how many of these particles are in your room? (Assume the particles are spheres of 2.5 μm diameter, and made primarily of soot, a form of carbon with a density of 2.5 g/cm^3.)

With the follow up question of:
How many of these particles are in each 6.48×10-1 L breath you take?

Any help is appreciated.  Thanks

[Borek]

What is a mass of single particle?