A magnesium-lead alloy of mass 7.5 kg consisting of a solid ? phase that has a composition just slightly below the solubility limit at 300 oC (570 oF).
a) What mass of lead is in the alloy?
b) If the alloy is heated to 400 oC (750 oF), how much more lead may be dissolved in the ? phase without exceeding the solubility limit of this phase?