500 g of FeCl3 salt was diluted with water to 1 liter. Calculate the molar concentration of FeCl3, calculate how many 10×10 cm electronic boards can theoretically be poisoned in this solution. The etching area of copper is 90% of the area of the electronic circuit board, the thickness of the copper is 40 μm, the density of copper is 8.9 g/cm3
