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A substance's concentration can be stated using a number of different units, including moles, percent (%) weight/volume, molarity, molality, parts per million (ppm), and mole fraction. The concentration reveals how much solute is present in a given amount of solvent. Given: The mass of sodium chloride is 125 grams. The mass of water is 1.5 kg. Find: The percent by mass of sodium chloride. Solution: The mass of sodium chloride is 125 grams. The mass of water is 1.5 kg = 1500 grams. The formula for percent by mass is given as: We know that Solution = Solute + Solvent Solution = 125 g + 1500 g = 1625 grams Therefore, the percent mass of sodium chloride will be: The percent by mass of sodium chloride is 7.629%. (责任编辑：) |