CHEMII0Table of Atoms, lons and Isotopes#, is number; atomic # = #p; mass # = #p + #n; # of protons = # of electrons when charge is zero# n°ChargeSymbol,massi xcharge#p'# e"QuestionnumberAtomic #Mass #191171807110940384649223886206Pb4+3445-211348490.8214231p3-9.838012610108 Ag1111649+312-11312853147618872Lab 2 Page 7 of 72.3.6

Given, As per our guidelines, we are supposed to answer only one question with three sub parts.…

CHEMII0 Table of Atoms, lons and Isotopes #, is number; atomic # = #p; mass # = #p + #n; # of protons = # of electrons when charge is zero # n° Charge Symbol, massil ycharge # p' # e" Question number Atomic # Mass # 19 1 17 180 71 109 40 38 46 4 92 238 86 206Pb4+ 34 45 -2 7 113 48 49 0. 8 21 42 31рз- 9. 83 80 126 10 108 Ag 11 116 49 +3 12 -1 13 128 53 14 76 188 72 Lab 2 Page 7 of 7 2. 3. 6

CHEMII0 Table of Atoms, lons and Isotopes #, is number; atomic # = #p; mass # = #p + #n; # of protons = # of electrons when charge is zero # n° Charge Symbol, massil ycharge # p' # e" Question number Atomic # Mass # 19 1 17 180 71 109 40 38 46 4 92 238 86 206Pb4+ 34 45 -2 7 113 48 49 0. 8 21 42 31рз- 9. 83 80 126 10 108 Ag 11 116 49 +3 12 -1 13 128 53 14 76 188 72 Lab 2 Page 7 of 7 2. 3. 6

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter2: Atoms, Molecules, And Ions

Section: Chapter Questions

Problem 21QAP: Bromine has two occuring isotopes: 79Br with atomic mass 78.9183 and 81Br with atomic mass 80.9163....

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An element consists of 1.40% of an isotope with mass 203.973 u, 24.10% of an isotope with mass 205.9745 u, 22.10% of an isotope with mass 206.9759 u, and 52.40% of an isotope with mass 207.Y766 u. Calculate the average atomic mass, and identify the element.
A gaseous binary compound has a vapor density that is 2.53 times that of nitrogen at 100°C and atmospheric pressure. When 8.21 g of the gas reacts with AlCl3 at 100°C, 1.62 g gaseous nitrogen is produced, removing all of the nitrogen originally present. (a) Estimate the molecular mass of the gaseous compound. (b) How many nitrogen atoms are there in a molecule of the compound? (c) What is the maximum possible value of the atomic mass of the second element? (d) Are other values possible for the atomic mass of the second element? Use a table of atomic masses to identify the element that best fits the data. (e) What is the molecular formula of the compound?
A gaseous binary compound has a vapor density that is 1.94 times that of oxygen at the same temperature and pressure. When 1.39 g of the gas is burned in an excess of oxygen, 1.21 g water is formed, removing all the hydrogen originally present. (a) Estimate the molecular mass of the gaseous compound. (b) How many hydrogen atoms are there in a molecule of the compound? (c) What is the maximum possible value of the atomic mass of the second element in the compound? (d) Are other values possible for the atomic mass of the second element? Use a table of atomic masses to identify the element that best fits the data. (e) What is the molecular formula of the compound?
These questions concern the work of J. J. Thomson. a. From Thomsons work, which particles do you think he would feel are most important for the formation of compounds (chemical changes), and why? b. Of the remaining two subatomic particles, which do you place second in importance for forming compounds, and why? c. Propose three models that explain Thomson's findings and evaluate them. To be complete you should include Thomsons findings
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Silversmiths are warned to limit their exposure to silver in the air to 1108 g Ag/L of air in a 40-hour week. What is the allowed exposure in terms of atoms of Ag/L/week?
Neon is an inert gas with three stable isotopes. It is used in gas lasers and in advertising signs. Its isotopes and their abundances are: Ne-20 19.9924 amu 90.51% Ne-21 20.9938 amu 0.27% Ne-22 21.9914 amu 9.22% What is the average atomic mass of neon?
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2.75 Chlorine has only two isotopes, one with mass 35 and the other with mass 37. One is present at roughly 75% abundance, and the atomic weight of chlorine on a periodic table is 35.45. Which must be the correct mass spectrum for chlorine?
Cerium is the most abundant rare earth metal. Pure cerium ignites when scratched by even a soft object. It has four known isotopes: 136Ce(atomicmass=135.907amu) ,138Ce(atomicmass=137.905amu) ,140Ce(atomicmass=139.905amu), and142Ce(atomicmass=141.909amu). Ce-140 and Ce-142 are fairly abundant. Which is the more abundant isotope?
Bromine has two occuring isotopes: 79Br with atomic mass 78.9183 and 81Br with atomic mass 80.9163. Without using a calculator, what would you estimate the % abundance of Br-79 to be?