Asked by peter

A sample of 300.0g of drinking wtare is found to cntain 38 mg Pb. What is this concentration in parts per million?
Answered by DrBob222
1 ppm = 1 part in 1,000,000 parts.
38 mg Pb = 0.038 g.
0.038g/300 g = ?? g Pb per 1 g water.
So ??g Pb per 1,000,000 g water?
Answered by peter
A 900.0 g sample of sea water is found to contain 6.7 x 10-3 g Zn. Express this concentration in parts per million?
Answered by DrBob222
Isn't this the same kind of problem?
Answered by peter
yes can you just guide me through this one and it will be the last
Answered by DrBob222
Guide you through it? Do it the same way as the first one. Calculate g Zn/g water, then convert to a million grams water.
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