2. You receive a primary standard of brass powder witha Certificate of Analysis (CoA). The CoA details thecomposition of the brass on a weight% basis as:65.2% Cu, 8.3% Zn, 10.3% Pb, 16.1% Sn. A stocksolution of the brass powder is prepared in a 250 mLvolumetric flask using 625 mg of sample. Calculatethe concentration of each metal in the stock solutionin ppm.