Problem 1E: When an iron object rusts, its mass increases. When a match burns, its mass decreases. Do these... Problem 2E: When a strip of magnesium metal is burned in air (recall Figure 2-1), it produces a white powder... Problem 3E: A 0.406 g sample of magnesium reacts with oxygen, producing 0.674 g of magnesium oxide as the only... Problem 4E: A 1.446 g sample of potassium reacts with 8.178 g of chlorine to produce potassium chloride as the... Problem 5E: When a solid mixture consisting of 10.500 g calcium hydroxide and 11.125 g ammonium chloride is... Problem 6E: Within the limits of experimental error, showthat the law of conservation of mass was obeyed in the... Problem 7E: In Example 2-1, we established flat the mass ratio of magnesium to magnesium oxide is 0.455 g... Problem 8E: Samples of pure carbon weighing 3.62, 5.91, and 7.07 g were burned in an excess of air. The masses... Problem 9E: In one experiment sodium was allowed to react with 16.12 chlorine. All the sodium was used up, and... Problem 10E: When 3.06 g hydrogen was allowed to react with an excess of oxygen, 27.35 g water was obtained. In a... Problem 11E: In one experiment, he burning of 0.312 g sulfur produced 0.623 g sulfur dioxide as the sole product... Problem 12E: In one experiment, the reaction of 1.00 g mercury and an excess of sulfur yielded 1.16 g of a... Problem 13E: Sulfur forms two compounds with oxygen. In compound, 1.000 g sulfur is combined with 0.998 g oxygen,... Problem 14E: Phosphorus forms two compounds chlorine.In be first compound, 1.000 g of phosphorus is combined with... Problem 15E: The following data were obtained for compounds of nitrogen and hydrogen: a. Show that these data are... Problem 16E: The following data were obtained for compounds of iodine and fluorine: a. Show that these data are... Problem 17E: There two oxide of copper. One oxide has 20% oxygen, by mass. The second oxide has a smaller percent... Problem 18E: The two oxides of carbon described on page 38 were CO and CO2. Another oxide of carbon has 1.106 g... Problem 19E: The following observations were made for a series of five oil drops an experiment similar to... Problem 20E: In an experiment similar to that described in Exercise 19, drop 1 carried a charge of 6.411015 C... Problem 21E Problem 22E Problem 23E: The following radioactive isotopes have applications medicine. Write their symbols in the form EZA .... Problem 24E: For the isotope H202g , express the percentage of the fundamental particles in the nucleus that are... Problem 25E: Complete the following table. What minimum amount of information is required to completely... Problem 26E: Arrange the following species order of increasing (a) number of electrons; (b) number of neutrons;... Problem 27E: For the atom 108Pd with mass 107.90389 u, determine a. the numbers of protons, neutrons, and... Problem 28E: For the ion R225a24 with a mass of 228.030 u, determine a. the numbers of protons, neutrons, and... Problem 29E: An isotope of silver has a mass that is 6.68374 times that of oxygen-16. What is the mass in u of... Problem 30E Problem 31E: The following data on isotopic masses are from a chemicalhandbook. What is the... Problem 32E: The following ratios of masses were obtained with a mass spectrometer:... Problem 33E: Which of the following species has a. equal numbers of neutrons and electrons; b. protons, neutrons,... Problem 34E Problem 35E: An isotope with mass numbers 44 has four more neutrons than protons. This is an isotope of what... Problem 36E: Identify the isotope X that has one more neutron than protons and a mass number equal to nine times... Problem 37E: Iodine has many radioactive isotopes.Iodine-123 is a radioactive isotope used for obtaining images... Problem 38E: Iodine-131 is a radioactive isotope that has important medical uses. Small doses of iodine-131 are... Problem 39E: Americium-241 is aradioactive isotope that is used high-precision gas and smoke detectors. How many... Problem 40E: Some foods are made safer to eat by being exposed to gamma rays from radioactive isotopes, such as... Problem 41E: Which statement is probably true concerning the masses of individual chlorine atoms: All have, some... Problem 42E: The mass of e carbon-12 atom is taken to be exactly 12 u. Are there likely to be any other atoms... Problem 43E: Magnesium has three naturally occurring isotopes. Their masses are 23.985042 u, 24.985837 u, and... Problem 44E: There are four naturally occurring isotopes of chromium. Their masses and percent isotopic are... Problem 45E: The two naturally occurring isotopes of silver have the following abundances: A107g , 51.84%; A109g... Problem 46E: Gallium has two naturally occurring isotopes. One of them, gallium-69, has a mass of 68.925581 u and... Problem 47E: The three naturally occurring isotopes of potassium are 30K,38.963707u;40K,39.963999u; and 41K . The... Problem 48E: Use the conventional atomic mass of boron to estimate the fractional isotopic abundances of the two... Problem 49E: A mass spectrum of germanium displayed peaks at mass numbers 70, 72, 73, 74, and 76, will relative... Problem 50E Problem 51E: Refer to the periodic table inside the front cover and identify a. the element that is in group 14... Problem 52E: Refer to the periodic table inside the front cover and identity a. the element that is in group 11... Problem 53E Problem 54E Problem 55E Problem 56E Problem 57E: Determine a. the number of moles of Zn in a 415.0 g sample of zinc metal b. the number of Cr atoms... Problem 58E: Determine a. the number of Kr atoms in a 5.25 mg sample of krypton b. the molar mass, M, and... Problem 59E: How many Cu atoms are present in a piece of sterling-silver jewelry weighing 33.24 g? (Sterling... Problem 60E: How many atoms are present in a 50.0 cm2 sample of plumber's solder, alead-tin alloy containing 67%... Problem 61E: How many 204Pb atoms are present in a piece of lead weighing 215 mg? The percent isotopic abundance... Problem 62E: A particular lead-cadmium alloy is 8.0% cadmium by mass. What mass of this alloy, in grams, must you... Problem 63E Problem 64E: During a severe episode of air pollution, the con-centration of lead in the air was observed to be... Problem 65E: Without doing detailed calculations, determine which of the following samples has the greatest of... Problem 66E Problem 67IAE: A solution was prepared by dissolving 2.50 g potassium chlorate (a substance used in fireworks and... Problem 68IAE Problem 69IAE: Fluorine has a single atomic species, 19F . Determine the atomic mass of 19F by summing the masses... Problem 70IAE Problem 71IAE: Use the fundamental definitions and statements from Chapter 1 and 2 to establish the fact that... Problem 72IAE: In each case, identify the element in question. a. The mass number of an atom is 234, and the atom... Problem 73IAE: Determine the only possible +2 ion for which the following two conditions are both satisfied: • The... Problem 74IAE Problem 75IAE: Suppose we redefined the atomic mass scale by arbitrarily assigning to the naturally occurring... Problem 76IAE: The two naturally occurring isotopes of nitrogen have masses of 14.0031 and 15.0001 u,respectively.... Problem 77IAE Problem 78IAE: Germanium has three major naturally occurring isotopes:... Problem 79IAE: From densities of the lines in the mass spectrum of krypton gas, the following observations were... Problem 80IAE: The two naturally occurring isotopes of chlorine are 25Cl(34.9689u,75.77%) and 27Cl(36.9658u,24.23%)... Problem 81IAE: How many atoms are present in a 1.50 m length of 20-gauge copper wire? A 20-gauge has a diameter of... Problem 82IAE: Monel metal is a corrosion-resistant copper-nickel alloy used the electronics industry. A particular... Problem 83IAE: Deuterium, 2H(2.0140u) , is sometimes used to replace the principal hydrogen isotope 1H in chemical... Problem 84IAE: An alloy that melts at about the boiling pointof water has Bi, Pb, and Sn atoms in the ratio 10:6:5,... Problem 85IAE: A particular silver solder (used in the electronics industry to join electrical components) to have... Problem 86IAE Problem 87IAE Problem 88IAE: Atoms are spherical and so when silver atoms pack together to form silver metal, they cannot fill... Problem 89FP: The data Lavoisier obtained in the experiment described on page 35 are as follows: Before heating:... Problem 90FP Problem 91FP Problem 92FP: German chemist Fritz Haber proposed paying off the reparations imposed against Germany after World... Problem 93FP: Mass spectrometry is one of the most versatile and powerful tools chemical analysis because of its... Problem 94SAE: In your own words, define or explain these terms or symbols: (a) EZA(b) (particle; (c) isotope; (d)... Problem 95SAE: Briefly describe a. the law of conservation of mass b.Rutherford's nuclear atom c. weighted-average... Problem 96SAE: Explain the important distinctions between each pair of terms: a. cathode rays and X-rays b. protons... Problem 97SAE: A certain element contains one atom of mass 10.013 u for every four atoms of mass 11.009 u. Compute... Problem 98SAE: When 10.0 g zinc and 8.0 g sulfur are allowed to react, all the zinc is consumed, 14.9 g zinc... Problem 99SAE Problem 100SAE: An attempt was made to determine he atomic mass of element X. If X forms a compound with oxygen that... Problem 101SAE: Cathode rays a. may be positively or negatively charged b. are a form of electromagnetic radiation... Problem 102SAE: The scattering of a particles by thin metal foils established that a.the mess of an atom is... Problem 103SAE Problem 104SAE: Which of the following is not a fundamental particle? (a) proton; (b) neutron; (c) beta particle;... Problem 105SAE: Which of the following scientists did not contribute to determining the structure of the atom? (a)... Problem 106SAE Problem 107SAE Problem 108SAE Problem 109SAE Problem 110SAE: The two species that have the same number of electrons as 22S are... Problem 111SAE Problem 112SAE Problem 113SAE: A 5.585-kg sample of iron (Fe) contains a.10.0 molFe b. twice as many atoms as does 600.6 g C c. 10... Problem 114SAE: A 91.84 g sample of Ti contains (a) 4.175 mol of Ti; (b) 6.0221022 Ti atoms; (c) 1.1551024 protons;... Problem 115SAE: There are three common iron-oxygen compounds. The one with the greatest proportion of iron has one... Problem 116SAE: The four naturally occurring isotopes of strontium have the atomic masses 83.9134 u; 85.9093 u;... Problem 117SAE Problem 118SAE format_list_bulleted