3. Perform the following conversions or complete the following problems involving dimensional analysis. Also provide unit plans. Make sure your answer has the correct number of significant digits and show all work for full credit. a) 71.63 g/cmto mg/dm b) 18.0 mL of water contains 6.022 x 1023 water molecules. How many hydrogen atoms are in 1.00 L of water? (Each water molecule, H20, contains two hydrogen atoms.) c) The daily dose of ampicillin for the treatment of an ear infection is 115 mg ampicillin per kilogram of body weight. What is the daily dose of the drug for a 27-Ib child