The dust from the bag house at a steel mill has the following composition (by mass): This material can be used in fertilizer but only after the lead has been removed. This may be accomplished by acid digestion and selective precipitation. The digestive step occurs with the addition of 36wt% dilute hydrochloric acid ( MW=36 ). One of the reactions that occurs is: Pb+2HClPbCl2(s)+H2 Using 50% excess acid, the amount of dilute acid (kg) required to precipitate the lead in 100kg of the dust is most nearly