Question

These problems all require you to show your work and there will not be any credit given without math/work for a problem. 1. Naturally occurring iodine has atomic mass of 126.9045 amu. A 12.3849 gram sample of iodine is accidentally contaminated with an additional 1.0070 grams of 12, a synthetic isotope used to treat diseases of the thyroid. The mass of lodine 129 is 128.9050 amu. Find the apparent "atomic mass" of the contaminated iodine. (Show the math for this.) 2. The mass of the average blueberry is 0.75 grams and the mass of an automobile is 2.0 X 10 'kg. Find the number of automobiles whose total mass is the same as 1 mole of blueberries. (Show all math with units.) 3. Three pure compounds form when 1.00 grams of sample X combines with, respectively, 0.472 grams, 0.630 grams and 0.789 grams of element Z. The first compound has the formula X,Zs. Find the empirical formulas of the other two. (Show math.) 4. The elements X and Y form a compound that is 40 % X and 60 %Y by mass. The atomic mass of X is twice that of Y. What is the empirical formula? (show all work with units) 5. Lead poisoning is a serious condition resulting from ingesting lead from the environment. It affects the nervous system, leading to symptoms such as distractibility, lethargy and loss of motor function. A modern chelating agent is succiner (CaHeO.S.). Suppose you are trying to determine the appropriate minimum dosage in mg to bind all the lead in a patient's blood. Assume the patient blood levels are 45 mg/dl, total blood volume is 5L and 1 mole of succiner will bind 1 mole of lead. (show all math with units)

Answer 1

0 1² Natural lodine mass = 12 3049 gram I'? , atomic mass = 12.6.9045 amo 1129Synthetic " , . - 120.9050 amu synthetic hel mass 1.0070 gm Apparent atomic may mass of Ist isotope x atomic mass) + mass ogni setobex At.moss mass of 1st isotope + Massed and isotope 12.3849 X 126.9045 amo +10070m x 12 8. 9050 am - Am 12 13 849 gm + 10070gm. 1571.6995 + 129.807335 13.3919 amu 1701.5069 13.3919 -amu = 127.055 amu Ansuley