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The environmental protection agency (EPA) has proposed a new standard for microparticulates in air: For particles up to 2.5 um in diameter, the maximum allowable amount is 50 ug/m3. If your 9.2 ft x 13.8 ft x 8.6 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 um diameter, and made primarily of soot, a form of carbon with a density of 2.5 g/cm3.)

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https://brainmass.com/chemistry/stoichiometry/particles-23688
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