Maximum permitted level of lead in drinking water is 7.0 ppm. Based on this information, how much lead can safely be dissolved in 1000 kg of water?

Answer

7 kg

Q: What is the definition of ppm? A: PPM is the abbreviation of 'parts per million', which represents the ratio between a substance and a million.
Calculating the maximum permitted level of lead in 1 kg of water. A: 7.0/1,000,000 * 1000 = 0.007 kg.
Calculating the total amount of lead can safely be dissolved in 1,000 kg of water. A: 0.007 * 1000 = 7 kg.