Principles of Modern Chemistry
8th Edition
ISBN: 9781305079113
Author: David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher: Cengage Learning
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Chapter 1, Problem 7P
Nitrogen (N) and silicon (Si) form two binary compounds with the following compositions:
a) Compute the mass of silicon that combines with 1.0000 g of nitrogen in each case.
(b) Show that these compounds satisfy the law of multiple proportions. If the second compound has the formula
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1. The atoms of elements A (blue) and B
(orange) form two compounds shown here.
Do these compounds obey the law of
multiple proportions? Why? Why not?
2. Give the number of protons, neutrons, and electrons in each of the following species:
(a) 20 1,Na, (b) 2 1,Na, (c) "0, and (d) carbon-14.
3. One isotope of a metallic element has mass number 65 and has 35 neutrons in its nucleus. The
cation derived from the isotope has 28 electrons. Write the symbol for this cation.
The element oxygen has three naturally occurring isotopes, with 8,9, and 10 neutrons in
the nucleus, respectively. (a) write the full chemical symbols for these three isotopes. (b)
Describe the similarities and differences between the three kinds of atoms of oxygen.
Estimate the percentage of the total mass of a atom that is due to (a) electrons, (b) protons, and (c) neutrons by assuming that the mass of the atom is simply the sum of the masses of the appropriate numbers of subatomic particles. The mass of an electron is 0.00054858 amu, the mass of a proton is 1.0073 amu, and the mass of a neutron is 1.0087 amu.
Chapter 1 Solutions
Principles of Modern Chemistry
Ch. 1 - Classify the following materials as substances or...Ch. 1 - Classify the following materials as substances or...Ch. 1 - A 17th-century chemist wrote of the “simple bodies...Ch. 1 - Since 1800, almost 200 sincere but erroneous...Ch. 1 - A sample of ascorbic acid (vitamin C) is...Ch. 1 - A sample of a compound synthesized and purified in...Ch. 1 - Nitrogen (N) and silicon (Si) form two binary...Ch. 1 - Iodine (I) and fluorine (F) form a series of...Ch. 1 - Vanadium (V) and oxygen (O) form a series of...Ch. 1 - Prob. 10P
Ch. 1 - Prob. 11PCh. 1 - Prob. 12PCh. 1 - Pure nitrogen dioxide (NO2) forms when dinitrogen...Ch. 1 - Gaseous methanol (CH3OH) reacts with oxygen (O2)...Ch. 1 - In J. J. Thompson’s experiment depicted in Figures...Ch. 1 - In the problem 15 above, what is vy , the...Ch. 1 - The natural abundances and isotopic masses of the...Ch. 1 - The natural abundances and isotopic masses of the...Ch. 1 - Prob. 19PCh. 1 - More than half of all the atoms in naturally...Ch. 1 - The isotope of plutonium used for nuclear fission...Ch. 1 - The last “missing” element from the first six...Ch. 1 - Prob. 23PCh. 1 - In 1982, the production of a single atom of...Ch. 1 - Prob. 25PCh. 1 - Prob. 26PCh. 1 - Compute the relative molecular masses of the...Ch. 1 - Prob. 28PCh. 1 - Suppose that a person counts out gold atoms at the...Ch. 1 - A gold atom has a diameter of 2.881010m . Suppose...Ch. 1 - The vitamin A molecule has the formula C20H30O ,...Ch. 1 - Arrange the following in order of increasing mass:...Ch. 1 - Mercury is traded by the “flask,” a unit that has...Ch. 1 - Gold costs $400 per troy ounce, and...Ch. 1 - Aluminum oxide (Al2O3) occurs in nature as a...Ch. 1 - Prob. 36PCh. 1 - Soft wood chips weighing 17.2 kg are placed in an...Ch. 1 - In a reproduction of the Millikan oil-drop...Ch. 1 - A rough estimate of the radius of a nucleus is...Ch. 1 - In a neutron star, gravity causes the electrons to...Ch. 1 - Prob. 41APCh. 1 - Naturally occurring rubidium (Rb) consists of two...Ch. 1 - A sample of a gaseous binary compound of boron and...
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- Two compounds of iron and chlorine, A and B, contain 1.270 g and 1.904 g of chlorine, respectively, for each gram of iron. Show that these amounts are in the ratio 2 : 3. Is this consistent with the law of multiple proportions? Explain.arrow_forwardTwo basic laws of chemistry are the law of conservation of mass and the law of constant composition. Which of these laws (if any) do the following statements illustrate? (a) The mass of phosphorus, P, combined with one gram of hydrogen, H, in the highly toxic gas phosphene, PH3, is a little more than twice the mass of nitrogen, N, combined with one gram of hydrogen in ammonia gas, NH3. (b) A cold pack has the same mass before and after the seal between two reactants is broken to allow reaction to occur. (c) It is highly improbable that carbon monoxide gas found in Los Angeles is C1.2O1.1.arrow_forwardThe formula of water is If-O. Which of the following is indicated by this formula? Explain your answer. a. The mass of hydrogen is twice that of oxygen in each molecule. b. There are two hydrogen atoms and one oxygen atom per water molecule. c. The mass of oxygen is twice that of hydrogen in each molecule. d. There are two oxygen atoms and one hydrogen atom per water molecule.arrow_forward
- Two samples of different compounds of sulfur and oxygen have the following compositions. Show that the compounds follow the law of multiple proportions. What is the ratio of oxygen in the two compounds for a fixed amount of sulfur? Amount S Amount O Compound A l.210g 1.811 g Compound B 1.783 g 1.779 garrow_forwardThe element europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 amu, and 153Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. a. Calculate the relative abundance of the two europium isotopes. b. Graph each fractional abundance value as a y-axis value in association with its corresponding mass value on the x-axis. Starting from each x-axis value, where y = 0, draw a vertical line up to the fractional abundance value. The result will approximate the type of visual graph a mass spectrometer would yield for europium in the 150155 amu range.arrow_forwardSamples of compound X, Y, and Z are analyzed, with results shown here. Compound Description Mass of Carbon Mass of Hydrogen X clear, colorless, liquid with strong odor 1.776 g 0.148 g Y clear, colorless, liquid with strong odor 1.974 g 0.329 g Z clear, colorless, liquid with strong odor 7.812 g 0.651 g Do these data provide example(s) of the law of definite proportions, the law of multiple proportions, neither, or both? What do these data tell you about compounds X, Y, and Z?arrow_forward
- Two samples of different compounds of nitrogen and oxygen have the following compositions. Show that the compounds follow the law of multiple proportions. What is the ratio of oxygen in the two compounds for a fixed amount of nitrogen? Amount N Amount O Compound A 1.206 g 2.755 g Compound B 1.651 g 4.714 garrow_forwardThe mass spectrum of phosphoryl chloride. POF3, is illustrated here. (a) Identify the cation fragment at a m/Z ratio of 85. (b) Identify the cation fragment at a m/Z ratio of 69. (c) Which two peaks in the mass spectrum provide evidence that the oxygen atom is connected to the phosphorus atom and is not connected to any of the three fluorine atoms?arrow_forwardCalculate the atomic mass of each of the following elements using the given data for the percentage abundance and mass of each isotope. a. Silver: 51.82% 107Ag (106.9 amu) and 48.18% 109Ag (108.9 amu) b. Silicon: 92.21% 28Si (27.98 amu), 4.70% 29Si (28.98 amu), and 3.09% 30Si (29.97 amu)arrow_forward
- There are 2.619 1022 atoms in 1.000 g of sodium. Assume that sodium atoms are spheres of radius 1.86 and that they are lined up side by side. How many miles in length is the line of sodium atoms?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_forwardWhat are the live most abundant elements (by mass) in the earth’s crust, oceans, and atmosphere?arrow_forward
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