Approximately 10 cm long coupons were cut radially using a tube cutter from each of the service line samples for bulk elemental analysis of the scale via inductively coupled plasma mass spectrometry (ICP-MS). Scale samples were collected a stainless steel spatula and dried in a oven. Dry masses of scale samples were measured and ground to a homogeneous fine powder. Acid digestion of the scale was conducted in which 10 mL of 1/1 concentrated nitric acid and water was added to approximately 0.20 g of dried scale. The slurry stirred and heated at 95 C for 15 min. After cooling, the digested sample was filtered through cotton a-cellulose filter and diluted to 100 mL. Digested scale samples were diluted by a factor of 1000 and analyzed mass of dry scale digested for each sample 12.4 +/- 4.6 wt% (median value 54.5% lead) Use your last name (below) to find which sample you are to evaluate. Wt% lead Length (cm) Mass of Scale 10.7 11.4 2.030 a. How many grams of lead are present in the scale removed from the sample corresponding to your last name? b. On average, the % lead in pipes is 54.5 wt%. Estimate how many grams of lead per meter of pipe was removed for your sample? c. What is the molar concentration of lead in the final diluted sample that was analyzed according to the procedure given above