42. Solving a chemistry problem

197. For the atomic absorption determination of copper in ore, a sample of 1.0000 g was dissolved in aqua regia and the resulting solution was diluted to 100 ml. Determine the mass fraction of copper in percent in two samples of ore, if the signal height at the wavelength of the copper line λ=324.7 nm was 17.5 mm and 22.5 mm, respectively. The measured values of standard solutions of copper under the same conditions for concentrations of 2, 1, and 0.5 μg/ml of copper turned out to be 30, 15, and 10 mm, respectively.