GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
11th Edition
ISBN: 9780134566030
Author: Petrucci
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 120SAE
Three of the following formulas might be ether an empirical or a molecular formula. The formula that must be a molecular formula is
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12.
(b) A student knew that calcium hydroxide could be made by adding calcium to water.
The student added 0.00131 mol of calcium to a beaker containing about 100 cm of water.
A reaction took place as shown by the equation below,
All the calcium hydroxide formed was soluble.
Ca(s) + 2H,0(1I) → Ca(OH) (aq) + H,(g)
(D Calculate the mass of calcium that the student added.
mass of calcium =
g
(ii) Calculate the volume of hydrogen gas, in dm3, produced in this reaction at room
temperature and pressure, RTP.
volume of hydrogen gas =
dm3
(iii) The student transferred the contents of the beaker to a 250 cm3 volumetric flask and
water was added to make the solution up to 250 cm³.
Calculate the concentration, in mol dm3, of hydroxide ions in the 250 cm³ solution.
concentration =
moldm 3
A compound is composed of carbon, hydrogen, nitrogen and oxygen. When a 1.500-g sample of the compound is completely combusted, it yields 1.476 g of CO2and 0.605 g of H2O. In a separate analysis to determine nitrogen, 1.500 g of the compound is found to produce 0.313 g of N2. (a) Calculate the mass percent of each element in the compound. (b) Determine the empirical formula of the compound. (c) If the compound has a molar mass of 134 g/mol, what is the molecular formula?
Home-Grown Example: Calculation of Mass-Related Concentrations
(a) A solution is made by dissolving 1.675 mg of sucrose (C₁2H22011) in 0.01091 g of
water. What is the mass percentage of each component of the solution? (b) A 1762-kg
sample of groundwater was found to contain 2.443 µg of Fe²+. What is the
concentration of Fe²+ in parts per billion?
Chapter 3 Solutions
GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
Ch. 3 - Refer to the color scheme given Figure 3-3, and...Ch. 3 - Give the molecular formulas for the molecules...Ch. 3 - Give the structure formulas of the molecules shown...Ch. 3 - Give the structure formulas of the molecules shown...Ch. 3 - Calculate the total number of (a) atoms one...Ch. 3 - Determine the mass, in grams, of a. 7.34molNO2 b....Ch. 3 - The amino acid methionine, which is essential in...Ch. 3 - Determine the number of moles of Br2 in a sample...Ch. 3 - Without doing detailed calculations, explain which...Ch. 3 - Without doing detailed calculations, determine...
Ch. 3 - Determine the number of moles of a. N2O4 in a 115...Ch. 3 - Determine the mass, in grams, of a. 2.10102 molS2...Ch. 3 - The content of is 15.5g/100 mLblood. The molar...Ch. 3 - In white phosphorus, P atoms are joined into P,...Ch. 3 - Prob. 15ECh. 3 - Prob. 16ECh. 3 - For the mineral torbernite, Cu( UO2)2( PO4)2,8H2O...Ch. 3 - For the compound Ge[S( CH 2 )4CH2]4 determine a....Ch. 3 - Determine the mass percent H in the hydrocarbon...Ch. 3 - Determine the mass percent O in the mineral...Ch. 3 - Determine the mass percent H in the hydrocarbon...Ch. 3 - Prob. 22ECh. 3 - Determine the mass percent of each of the elements...Ch. 3 - Prob. 24ECh. 3 - Determine the percent, by mass,of the indicated...Ch. 3 - All of the following minerals are semiprecious or...Ch. 3 - Without doing calculations, arrange the following...Ch. 3 - Prob. 28ECh. 3 - Two oxides of sulfur have nearly identical...Ch. 3 - An oxide of chromium used in chrome plating has a...Ch. 3 - Diethylene glycol, used to de-ice aircraft, is a...Ch. 3 - Prob. 32ECh. 3 - Determine the empirical formula of (a) the...Ch. 3 - Prob. 34ECh. 3 - A compound of carbon and hydrogen consists of...Ch. 3 - Selenium, an element used in the manufacture of...Ch. 3 - Indigo, the dye for blue jeans, has a percent...Ch. 3 - Prob. 38ECh. 3 - Prob. 39ECh. 3 - The element X forms the compound XOCI2 containing...Ch. 3 - Prob. 41ECh. 3 - Two compounds of CI and X are found to have...Ch. 3 - A 0.1888 g sample of a hydrocarbon produces 0.6260...Ch. 3 - Para-cresol (p-cresol) is used as a disinfectant...Ch. 3 - Dimethylhydrazine is a carbon-hydrogen-nitrogen...Ch. 3 - Prob. 46ECh. 3 - Without doing detailed calculations, explain which...Ch. 3 - Prob. 48ECh. 3 - A 1.562 g sample of the alcohol CH2CHOHCH2CH2 is...Ch. 3 - Prob. 50ECh. 3 - Indicate the oxidation state of the underlined...Ch. 3 - Indicate the oxidation state of S in (a) SO42 (b)...Ch. 3 - Prob. 53ECh. 3 - Prob. 54ECh. 3 - Prob. 55ECh. 3 - Hydrogen and oxygen usually have oxidation states...Ch. 3 - Prob. 57ECh. 3 - Name these compounds: (a)Ba(...Ch. 3 - Prob. 59ECh. 3 - Prob. 60ECh. 3 - Prob. 61ECh. 3 - Prob. 62ECh. 3 - Write a formula for (a) the chloride of titanium...Ch. 3 - Write formula for (a) an oxide of nitrogen with N...Ch. 3 - Prob. 65ECh. 3 - Supply the formula for the acids: (a) hydrofluoric...Ch. 3 - Name the following compounds and specify which...Ch. 3 - Prob. 68ECh. 3 - Prob. 69ECh. 3 - Prob. 70ECh. 3 - Anhydrous CuSO4 can be used to dry liquids in...Ch. 3 - Anhydrous sodium sulfate, Na2SO4 absorbs water...Ch. 3 - A certain hydrate is found to have the composition...Ch. 3 - An 8.129 g sample of MgSO4H2O is heated until all...Ch. 3 - Prob. 75ECh. 3 - Prob. 76ECh. 3 - Prob. 77ECh. 3 - Prob. 78ECh. 3 - Prob. 79ECh. 3 - Prob. 80ECh. 3 - Prob. 81ECh. 3 - Prob. 82ECh. 3 - The mineral spodumene has the empirical formula...Ch. 3 - Prob. 84IAECh. 3 - Prob. 85IAECh. 3 - The important natural sources of boron compounds...Ch. 3 - Prob. 87IAECh. 3 - By analysis, a compound was found to contain 26.58...Ch. 3 - Prob. 89IAECh. 3 - What is the molecular formula of a hydrocarbon...Ch. 3 - A hydrocarbon mixture consists of 601% by mass of...Ch. 3 - A 0.732 g mature of methane, CH4 and ethane, C2H5...Ch. 3 - The density of a mixture of H2SO4 and water is...Ch. 3 - Prob. 94IAECh. 3 - Prob. 95IAECh. 3 - Prob. 96IAECh. 3 - Prob. 97IAECh. 3 - Prob. 98IAECh. 3 - The metal M forms the sulfate M2( SO4)2. A 0.738 g...Ch. 3 - Prob. 100IAECh. 3 - Prob. 101IAECh. 3 - Prob. 102IAECh. 3 - A 1.013 g sample of ZnSO4H2O is dissolved in water...Ch. 3 - The iodide ion in a 1.552 g sample of the compound...Ch. 3 - Prob. 105IAECh. 3 - The insecticide dieldrin contains carbon, oxygen,...Ch. 3 - Prob. 107IAECh. 3 - The atomic mass of Bi is to be determined by...Ch. 3 - A piece of gold (Au) foil measuring 0.25mm15mm is...Ch. 3 - Prob. 110IAECh. 3 - Prob. 111IAECh. 3 - All-purpose fertilizers contain the essential...Ch. 3 - A hydrate of copper(II) sulfate, when heated, goes...Ch. 3 - Prob. 114FPCh. 3 - Prob. 115SAECh. 3 - Prob. 116SAECh. 3 - Prob. 117SAECh. 3 - Prob. 118SAECh. 3 - Prob. 119SAECh. 3 - Three of the following formulas might be ether an...Ch. 3 - Prob. 121SAECh. 3 - Prob. 122SAECh. 3 - Iron is present red blood and acts to carry oxygen...Ch. 3 - Prob. 124SAECh. 3 - Prob. 125SAECh. 3 - Prob. 126SAECh. 3 - Prob. 127SAECh. 3 - Prob. 128SAECh. 3 - Prob. 129SAECh. 3 - Which compound has a molar mass of...Ch. 3 - Prob. 131SAECh. 3 - Prob. 132SAECh. 3 - A hydrate of Na2SO2 contains almost exactly 50%...Ch. 3 - Malachite is a common copper-containing mineral...Ch. 3 - Prob. 135SAECh. 3 - Ibuprofen is a compound used in painkiller. When a...Ch. 3 - Prob. 137SAE
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