An aqueous solution has 0.0086 g of oxygen dissolved in 2.5 L of water. Calculate the dissolved oxygen concentration of this solution in parts per million.
What mass of solute, in mg is present in a 250 mL sample of potassium chloride solution with a concentration of 7.2 ppm?
Any shipment of peanuts that contains more than 25 ppb of this dangerous fungus is rejected. A company receives 15 t of peanuts to make peanut butter. What is the maximum mass, in grams, of fungus that is allowed?
In many areas, the drinking water standard for nitrate ions is 5.00 ppb. Calculate the mass in yg, of nitrate ions allowed in one glass of 345 mL of tap water