Chemistry: The Molecular Science
5th Edition
ISBN: 9781285199047
Author: John W. Moore, Conrad L. Stanitski
Publisher: Cengage Learning
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Chapter 2, Problem 27QRT
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The mass spectrum of an organic compound shows the relative abundances of M to be 87.83% and M+1 to be 11.40%.
Assuming the peaks are caused by 12C and 1C isotopes, determine the number of carbon atoms in the compound. The
natural abundance of 1?C is 98.93%, and the natural abundance of 13C is 1.07%.
number of carbon atoms:
Formula mass of H20 3D | (2 Н atoms) * (1.01 aти)) + (10 atoт) * (16.00 ати)]
— 18. 02 ати
Water (H2O) has two H atoms, so the atomic mass of one H atom (found on the periodic table) must be
multiplied by two. As only one oxygen atom is in the compound, the atomic mass of an O atom is multiplied
by the number one. Let's look at a slightly more difficult example. Take a minute and calculate the formula
mass of the compound, aluminum carbonate, Al2(CO3)3, in the box below. Show all of your work.
Show work here:
The element X has three naturally occurring isotopes. The isotopic masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is
Isotope Abundance
53X
amu.
Mass
19.61
52.62
56X
53.91
56.29
58X
26.48
58.31
O 55,74
O 33.33
O 57.23
O 56.29
O 56.11
Chapter 2 Solutions
Chemistry: The Molecular Science
Ch. 2.1 - When you comb your hair on a dry day, your hair...Ch. 2.2 - Prob. 2.1PSPCh. 2.2 - Prob. 2.2PSPCh. 2.2 - Prob. 2.2CECh. 2.2 - Prob. 2.3PSPCh. 2.3 - Prob. 2.4PSPCh. 2.3 - A student in your chemistry class tells you that...Ch. 2.3 - Prob. 2.5PSPCh. 2.3 - Prob. 2.4CECh. 2.3 - Prob. 2.5CE
Ch. 2.4 - Prob. 2.6PSPCh. 2.4 - Prob. 2.6CECh. 2.4 - Prob. 2.7PSPCh. 2.4 - Prob. 2.8PSPCh. 2.5 - Prob. 2.9PSPCh. 2.5 - Prob. 2.10PSPCh. 2.6 - Prob. 2.7CECh. 2.7 - Prob. 2.8CECh. 2.7 - Prob. 2.11PSPCh. 2.7 - Prob. 2.9ECh. 2.8 - Prob. 2.12PSPCh. 2.8 - Prob. 2.10ECh. 2.9 - Prob. 2.11ECh. 2.9 - Prob. 2.12ECh. 2.9 - Prob. 2.13CECh. 2.9 - According to Table 2.10, five constitutional...Ch. 2.11 - Calculate (a) the amount of Ti atoms in 4.00 g...Ch. 2.11 - Prob. 2.15CECh. 2.11 - Prob. 2.16ECh. 2.11 - Prob. 2.17CECh. 2.11 - Prob. 2.18ECh. 2.11 - Prob. 2.19ECh. 2.11 - Prob. 2.14PSPCh. 2.11 - Prob. 2.15PSPCh. 2.11 - Prob. 2.16PSPCh. 2.11 - Prob. 2.20CECh. 2.12 - Prob. 2.17PSPCh. 2.12 - Prob. 2.18PSPCh. 2.12 - Prob. 2.21ECh. 2.12 - Hydrazine is composed of 87.42% nitrogen and...Ch. 2.12 - Prob. 2.20PSPCh. 2.12 - Prob. 2.22ECh. 2 - An isotope of an element contains 63 protons and...Ch. 2 - Prob. IISPCh. 2 - Prob. IIISPCh. 2 - Dioxathion, a pesticide, contains carbon,...Ch. 2 - Prob. 1QRTCh. 2 - Prob. 2QRTCh. 2 - Prob. 3QRTCh. 2 - Prob. 4QRTCh. 2 - Prob. 5QRTCh. 2 - Prob. 6QRTCh. 2 - Prob. 7QRTCh. 2 - Prob. 8QRTCh. 2 - Prob. 9QRTCh. 2 - Prob. 10QRTCh. 2 - Match these by placing the correct notation in the...Ch. 2 - Prob. 12QRTCh. 2 - Prob. 13QRTCh. 2 - Prob. 14QRTCh. 2 - Prob. 15QRTCh. 2 - Prob. 16QRTCh. 2 - Prob. 17QRTCh. 2 - Prob. 18QRTCh. 2 - Prob. 19QRTCh. 2 - Prob. 20QRTCh. 2 - Prob. 21QRTCh. 2 - Prob. 22QRTCh. 2 - Prob. 23QRTCh. 2 - Prob. 24QRTCh. 2 - Prob. 25QRTCh. 2 - Prob. 26QRTCh. 2 - Prob. 27QRTCh. 2 - Prob. 28QRTCh. 2 - Argon has three naturally occurring isotopes:...Ch. 2 - Prob. 30QRTCh. 2 - Prob. 31QRTCh. 2 - Prob. 32QRTCh. 2 - Prob. 33QRTCh. 2 - Prob. 34QRTCh. 2 - Prob. 35QRTCh. 2 - Prob. 36QRTCh. 2 - Prob. 37QRTCh. 2 - Prob. 38QRTCh. 2 - Prob. 39QRTCh. 2 - Prob. 40QRTCh. 2 - Prob. 41QRTCh. 2 - Prob. 42QRTCh. 2 - Prob. 43QRTCh. 2 - Prob. 44QRTCh. 2 - Prob. 45QRTCh. 2 - Prob. 46QRTCh. 2 - Prob. 47QRTCh. 2 - Prob. 48QRTCh. 2 - Prob. 49QRTCh. 2 - Prob. 50QRTCh. 2 - Prob. 51QRTCh. 2 - Prob. 52QRTCh. 2 - Prob. 53QRTCh. 2 - Prob. 54QRTCh. 2 - Prob. 55QRTCh. 2 - Prob. 56QRTCh. 2 - Prob. 57QRTCh. 2 - Prob. 58QRTCh. 2 - Prob. 59QRTCh. 2 - Prob. 60QRTCh. 2 - Prob. 61QRTCh. 2 - Prob. 62QRTCh. 2 - Prob. 63QRTCh. 2 - Prob. 64QRTCh. 2 - Prob. 65QRTCh. 2 - Prob. 66QRTCh. 2 - Prob. 67QRTCh. 2 - Prob. 68QRTCh. 2 - Prob. 69QRTCh. 2 - Prob. 70QRTCh. 2 - Prob. 71QRTCh. 2 - Prob. 72QRTCh. 2 - Prob. 73QRTCh. 2 - Prob. 74QRTCh. 2 - If you have a ring that contains 1.94 g gold,...Ch. 2 - You have a pure sample of the antiseptic...Ch. 2 - You have a pure sample of apholate, C12H24N9P3, a...Ch. 2 - Prob. 78QRTCh. 2 - Prob. 79QRTCh. 2 - Prob. 80QRTCh. 2 - Prob. 81QRTCh. 2 - Prob. 82QRTCh. 2 - Prob. 83QRTCh. 2 - Prob. 84QRTCh. 2 - Prob. 85QRTCh. 2 - Prob. 86QRTCh. 2 - Prob. 87QRTCh. 2 - Prob. 88QRTCh. 2 - Prob. 89QRTCh. 2 - Prob. 90QRTCh. 2 - Quinine (molar mass = 324.41 g/mol) is used as a...Ch. 2 - Prob. 92QRTCh. 2 - The mineral uraninite is a uranium oxide that is...Ch. 2 - Carbonic anhydrase, an important enzyme in...Ch. 2 - Nitrogen fixation in the root nodules of peas and...Ch. 2 - Disilane, Si2Hx, contains 90.28% silicon by mass....Ch. 2 - Chalky, white crystals in mineral collections are...Ch. 2 - A well-known reagent in analytical chemistry,...Ch. 2 - Prob. 99QRTCh. 2 - Prob. 100QRTCh. 2 - The density of a solution of sulfuric acid is...Ch. 2 - Prob. 102QRTCh. 2 - Prob. 103QRTCh. 2 - Prob. 104QRTCh. 2 - Prob. 105QRTCh. 2 - Prob. 106QRTCh. 2 - Prob. 107QRTCh. 2 - The Statue of Liberty in New York harbor is made...Ch. 2 - Prob. 109QRTCh. 2 - Prob. 110QRTCh. 2 - Prob. 111QRTCh. 2 - Prob. 112QRTCh. 2 - Prob. 113QRTCh. 2 - Prob. 114QRTCh. 2 - Prob. 115QRTCh. 2 - Prob. 116QRTCh. 2 - Prob. 117QRTCh. 2 - Prob. 118QRTCh. 2 - Prob. 119QRTCh. 2 - Prob. 120QRTCh. 2 - Prob. 121QRTCh. 2 - Prob. 122QRTCh. 2 - Prob. 123QRTCh. 2 - Prob. 124QRTCh. 2 - Prob. 125QRTCh. 2 - Prob. 126QRTCh. 2 - Prob. 127QRTCh. 2 - Prob. 128QRTCh. 2 - Prob. 129QRTCh. 2 - The element bromine is Br2, so the mass of a Br2...Ch. 2 - Uranium is used as a fuel, primarily in the form...Ch. 2 - Prob. 132QRTCh. 2 - Hemoglobin is an iron-containing protein (molar...Ch. 2 - There are three naturally occurring isotopes of...Ch. 2 - Prob. 135QRTCh. 2 - Prob. 136QRTCh. 2 - Prob. 137QRTCh. 2 - An adult human body contains 6.0 L blood, which...Ch. 2 - Prob. 139QRTCh. 2 - Prob. 140QRTCh. 2 - Prob. 141QRTCh. 2 - The present average concentration (mass percent)...Ch. 2 - Prob. 144QRTCh. 2 - A 4.22-g mixture of calcium chloride and sodium...Ch. 2 - A certain metal, M, forms two oxides, M2O and MO....Ch. 2 - If you heat Al with an element from Group 6A, an...Ch. 2 - Prob. 2.ACPCh. 2 - The age of the universe is unknown, but some...Ch. 2 - Prob. 2.CCPCh. 2 - Prob. 2.DCPCh. 2 - Prob. 2.ECP
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- The mass spectrum of bromine (Br2) consists of three peaks with the following characteristics: Mass (u) Relative Size 157.84 0.2534 159.84 0.5000 161.84 0.2466 How do you interpret these data?arrow_forwardConsider the following data for three binary compounds of hydrogen and nitrogen: %H (by Mass) %N (by Mass) I 17.75 82.25 II 12.58 87.42 III 2.34 97.66 When 1.00 L of each gaseous compound is decomposed to its elements, the following volumes of H2(g) and N2(g) are obtained: H2(L) N2(L) I 1.50 0.50 II 2.00 1.00 III 0.50 1.50 Use these data to determine the molecular formulas of compounds I, II, and III and to determine the relative values for the atomic masses of hydrogen and nitrogen.arrow_forwardThe element bromine is Br2, so the mass of a Br2 molecule is the sum of the mass of its two atoms. Bromine has two isotopes. The mass spectrum of Br2 produces three peaks with relative masses of 157.836, 159.834, and 161.832, and relative heights of 6.337, 12.499. and 6.164, respectively. (a) What isotopes of bromine are present in each of the three peaks? (b) What is the mass of each bromine isotope? (c) What is the average atomic mass of bromine? (d) What is the abundance of each of the two bromine isotopes?arrow_forward
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- A compound associated with the odor of garlic on a persons breath has the chemical formula CyH8S and a formula mass of 88.19 amu. What number does y stand for in the chemical formula of the compound?arrow_forwardReference Section 5-2 to find the atomic masses of 12C and 13C, the relative abundance of 12C and 13C in natural carbon, and the average mass (in u) of a carbon atom. If you had a sample of natural carbon containing exactly 10,000 atoms, determine the number of 12C and 13C atoms present. What would be the average mass (in u) and the total mass (in u) of the carbon atoms in this 10,000-atom sample? If you had a sample of natural carbon containing 6.0221 1023 atoms, determine the number of 12C and 13C atoms present What would be the average mass (in u) and the total mass (in u) of this 6.0221 1023 atom sample? Given that 1 g = 6.0221 1023 u, what is the total mass of I mole of natural carbon in units of grams?arrow_forwardGallium arsenide, GaAs, has gained widespread use in semiconductor devices that convert light and electrical signals in fiber-optic communications systems. Gallium consists of 60.% 69Ga and 40.% 71Ga. Arsenic has only one naturally occurring isotope, 75As. Gallium arsenide is a polymeric material, but its mass spectrum shows fragments with the formulas GaAs and Ga2As2. What would the distribution of peaks look like for these two fragments?arrow_forward
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