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Mole conversion problems

Hkhan
in Chemistry

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1. Here is a mole conversion question I am having a hard time.

 

Medical experts generally believe a level of 27micrograms
Pb(lead) per deciliter of blood poses a significant health risk (1dl = .1 L)

 


Express this level in the unit mol Pb/L blood.
Express your answer using two significant figures.
and this one
2. During a severe episode of air pollution, the concentration of lead in the air was observed to be 3.01 micrograms Pb/m^3 .
How many Pb(lead) atoms would be present in a 0.500 -- L sample of this air (the approximate lung capacity of a human adult)?
These are my questions i am more looking forward to a great explanation rather than the answer(if you explain it to me without the answer that would be even better). I know how to solve mole conversions but i have no idea how to tackle these problems.
Thank you

Edited by Hkhan

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