Question

A sample of 300.0g of drinking wtare is found to cntain 38 mg Pb. What is this concentration in parts per million?

Answer 1

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?

Answer 2

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?

Answer 3

Isn't this the same kind of problem?

Answer 4

yes can you just guide me through this one and it will be the last

Answer 5

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.