Thursday

April 17, 2014

April 17, 2014

Posted by **manny** on Tuesday, September 4, 2007 at 4:05pm.

I need help with this problem--- I have no idea how to go about it

_______________________________________________________________

An average adult breathes about 8.5 x 10^3 L of air per day. The concentration of lead in higly polluted urban air is 7.0 x 10^-6 g of lead per one m3 of air. Assume that 75% of the lead is present as particles less than 1.0 x 10^-6 m in diameter, and that 50% of the particles below that size are retained in the lungs. Calculate the mass of lead absorbed in this manner in one year by an average adult living in this environment.

***Note answer has two sigfigs

__________________________________________________

Thanks for all the help you guys can provide,

manny

- chem -
**DrBob222**, Tuesday, September 4, 2007 at 5:04pmHow about this hint.

(7.0 x 10^6 g/m^{3}) x 0.75 x 1/2 = amount of consumable lead. Convert 8.5 x 10^{3}L to cubic meters (or the other way around--it doesn't matter which one you convert) and calculate the amount consumed per day. Then multiply by 365 to convert to amount per year.

- chem -
**manny**, Tuesday, September 4, 2007 at 5:55pmok! thanks... Dr. Bob your the best!!!

I assumed you meant (7.0 x 10^-6 g/m3)

I got 8.1 x 10^-3 g Pb / year

_____________________________________________________________________________________________________________________

**Related Questions**

Math - Okay ... just checking on how to figure this ... Here is the problem: ...

CHEM - Air is approximately 80% nitrogen and 20% oxygen (on a mole basis). If 6 ...

chemistry - a resting person requires 14.5 L of O2 per hour to maintain ...

Math - Suppose that humans walk about 10,000 steps per day on average. Your ...

physics - Air consists of molecules of several types, with an average molar mass...

Physics. Please!! - If the force on the tympanic membrane (eardrum) increases by...

math - Suppose that humans walk about 10,000 steps perday on average. Your ...

College Math - The average urbanite walks about 2 yd per second. A) How many ...

math - During one year, about 13 million adults over 18 years old in the U.S. ...

Math - During one year, about 13 million adults over 18 years old in the U.S. ...