Lead metal can be extracted from a mineral called galena whichcontains 86.6 % le

Lead metal can be extracted from a mineral called galena whichcontains 86.6 % lead by mass. A particular ore contains 68.5 %galena by mass.If the lead can be extracted with 92.5 % efficiencywhat mass of ore is required to make a lead sphere with a 4.00 cmradius?