The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in
a 1.3 cm cuvette or path length. The absorbance is 0.435 and the molar absorptivity coefficient is 86,300 M-1cm-1.
The molecular weight for chlorophyll a is 893.49 g/mol.
If the molar concentration of the solution is .00000387, then what is the concentration of the solution in ppm (parts per million)?