How much of the water (in ml) contains 170 mg of pb? (assume a density of 1.0 g/ml.)

Let us try it.
0.0013% = 0.0013 g/100 ml water, or 1.3 mg/100 ml water
so for 145 mg, you need 145*100/1.3 = 11154 ml water or 11.154 L of
water
There you have it
0.0013% = 0.0013 g/100 ml water, or 1.3 mg/100 ml water
so for 145 mg, you need 145*100/1.3 = 11153 ml water or 11.153 L of
water

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