# chemistry

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pleast help me work this prob
lead is a toxic meatal that affects the central nervous system. a Pb-contaminated water sample contains 0.0011% Pb by mass. What vilume of the water in milliliters contains 115g of Pb? (assume that the density of the solution is 1.0g/ml

• chemistry -

0.0011% by mass means that for every 100 grams of solution (water), there is 0.0011 grams of lead.

By proportions noting 1 ml of water weighs 1 g:
100 ml : 0.0011 g
x ml : 115 g

So by cross multiplication:
x = 100*115/0.0011=10454545 ml
= 10454.545 l

• chemistry -

I obtained the same number; I would express it as 1.0E4L to two significant figures.

• chemistry -

Thanks Dr. Bob, I forgot about that!

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