1. The National Drinking Water standard for lead in water is no more than 0.015ppm. If a particular water supply sample has 5.0x10^-7 moles of Pb per 5.0 liters, is it suitable for drinking?
3. A metal tank of volume 75.5L will burst if the pressure in it exceeds 75.0atm. Will this pressure be exceeded by 88.0 moles of a gas in it at 25oC?
1) 'ppm' means parts per million. And it is described as mass of solute/ mass of solution times 10^6. So first we need to calculate the mass of 5*10^-7 moles of Pb. and for that ...
The solution uses the relevant theory and calculations to answer the asker's question to see if lead content is too much to make the water drinkable.