In clinical applications, the unit parts per million (ppm) is used to express very small concentrations of solute, where 1ppm is equivalent to 1mg of solute per 1L of solution. Calculate the concentration in parts per million for each of the solutions. 1. There is 17µg of calcium in a total volume of 95mL. 2. There is 0.75mg of caffeine in a total volume of 129mL. 3. There is 0.17mg of trace particles in a total volume of 61 dL.