How many ppm of lead are there if 0.2 g of lead is found in 50 L of water?

Answer 1

ppm = mg / L

0.2 g x 1000 mg/g = 200 mg

Liters = 50

ppm = 200 mg/50 L = 4 ppm

Answer 2

What's the mass of water?

50L=50,000mL

50,000mL of water @ 1g/mL =50000g water

ppm=grams of lead in 1 million grams of water

compare like grams/milliongrams, but find out what portion of a million 50000g of water is

50,000/1E6=0.00005 million grams water

0.2g/0.00005g=4000ppm

0.2 grams lead

ppm=g/milliongrams

0.2/0.00005=4000 ppm