Answered: b. What is the role of iodine in the…

b. What is the role of iodine in the human body? c. How many milligrams of iodine would be a typical amount in a 60.-kg adult?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter3: Stoichiometry

Section: Chapter Questions

Problem 27Q: If you had a mole of U.S. dollar bills and equally distributed the money to all of the people of the...

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If you had a mole of U.S. dollar bills and equally distributed the money to all of the people of the world, how rich would every person be? Assume a world population of 7 billion.
Physiological saline concentration—that is, the sodium chloride concentration in our bodies—is approximately 0.16 M . A saline solution fur contact lenses is prepared to match the physiological concentration. If you purchase 25 mL of contact lens saline solution, how many grams of sodium chloride have you bought?
3.107 As computer processor speeds increase, it is necessary for engineers to increase the number of circuit elements packed into a given area. Individual circuit elements are often connected using very small copper “wires” deposited directly onto the surface of the chip. In some processors, these copper interconnects are about 22 nm wide. How many copper atoms would be in a 1-mm length of such an interconnect, assuming a square cross section? (The density of copper is 8.96 g/cm3.)
The meat from one hazelnut has a mass of 0.985 g. (a) What is the mass of a millionth of a mole (106) of hazelnut meats? (A millionth of a mole is also called a micromole.) (b) How many moles are in a pound of hazelnut meats?
Hydrogen peroxide is used as a cleaning agent in the treatment of cuts and abrasions for several reasons. It is an oxidizing agent that can directly kill many microorganisms: It decomposes upon contact with blood, releasing elemental oxygen gas (which inhibits the growth of anaerobic microorganisms); and it foams upon contact with blood, which provides a cleansing action. In the laboratory, small quantities of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2(s)+2HCl(aq)H2O2(aq)+BaCl2(aq) What amount of hydrogen peroxide should result when 1.50 g of barium peroxide is treated with 25.0 mL of hydrochloric acid solution containing 0.0272 g of HCI per mL?
A sample of an oxide of vanadium weighing 4.589 g was heated with hydrogen gas to form water and another oxide of vanadium weighing 3.782 g. The second oxide was treated further with hydrogen until only 2.573 g of vanadium metal remained. (a) What are the simplest formulas of the two oxides? (b) What is the total mass of water formed in the successive reactions?
How many gulss 139 B. lh.U. equal to are
A certain alloy with a density of 11.5 g/cm3 contains 55% iron by mass. a) How many pg of iron would be present in a 4.5"x5.0"x11" piece of alloy?
4. How do you distinguish a. Chemical properties from physical properties b. Distillation from filtration С. c. Solute from a solution d. Mixture from a compound е. Atom from a molecule
Example 60 mice, each weighing 2 kg, were used in a lethal dose (LD50) experiment. The number of death mice versus the mass of substance A given to each mouse presented in the Figure below. 70 60 E S0 40 30 ultann A E 20 10 10 15 20 29 30 35 40 Mass of Sulstance given to each mouse (mg) Calculate the lethal dose (LD50) of substance A and B seperately. • Which one of the substances is more toxic? Number of death mice
46.) Which statement is correct a. Sugar is a good conductor b. NaCl is a good conductor c. Aqueous NaCl is a good conductor d. Aqueous sugare is a good conductor
A bottle of a tile cleanser contains 135g og HCl and 775g of water. What is the percent by mass og HCl in this cleanser?