Percent by definition is parts per hundred. % (w/w) = (mass of solute/mass of solution) x 100. For very dilute solutions, chemists will often use parts per thousand or parts per million (ppm) or parts per billion (ppb). Calculate the concentration of a solution using each of these units. The legal limit of blood alcohol limit in most states is 0.080 grams per 100.0 grams of blood. What is this concentration in parts per thousand?

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