47: Determine the number of moles of molecules (or formula units) in each sample. 38.2 g sodium chloride, 36.5 g nitrogen monoxide, 4.25 kg carbon dioxide, 2.71 mg carbon tetrachloride
47: Determine the number of moles of molecules (or formula units) in each sample. 38.2 g sodium chloride, 36.5 g nitrogen monoxide, 4.25 kg carbon dioxide, 2.71 mg carbon tetrachloride
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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19: How many atoms are in each
3.4 mol Cu, 9.7*103 mol C, 22.9 mol Hg, 0.215 mol Na
25: How many moles of tin atoms are in a pure tin cup with a mass of 38.1 g?
27: A pure gold coin contains 0.145 mol of gold. What is its mass?
33: A pure silver ring contains 0.0134 mmol (milimol) Ag. How many silver atoms does it
contain?
39: How many carbon atoms are in a diamond (pure carbon) with a mass of 38 mg?
41: How many titanium atoms are in a pure titanium bicycle frame with a mass of 1.28 kg?
47: Determine the number of moles of molecules (or formula units) in each sample.
38.2 g sodium chloride, 36.5 g nitrogen monoxide, 4.25 kg carbon dioxide,
2.71 mg carbon tetrachloride
51: A mothball, composed of naphthalene (C10H8), has a mass of 1.32 g. How many
naphthalene molecules does it contain?
55: A sugar crystal contains approximately 1.8*1017 sucrose (C12H22011) molecules. What is
its mass in milligrams?
59: Determine the number of moles of CI in 2.7 mol CaCI,
67: How many grams of Cl are in 38.0 g of each sample of chlorofluorocarbons (CFCS)?
CF2C12, CFCI3, C2F3C]3, CF3CI
73: A 1.912-g sample of calcium chloride is decomposed into its constituent elements and
found to contain 0.690 g Ca and 1.222 g Cl. Calculate the mass percent composition of Ca
and Cl in calcium chloride.
79: Calculate the mass percent composition of nitrogen in each compound
N20, NO, NO2, N2O5
87: A compound containing nitrogen and oxygen is decomposed in the laboratory and
produces 1.78 g of nitrogen and 4.05 g of oxygen. Calculate the empirical formula of the
compound
91: The rotten smell of a decaying animal carcass is partially due to a nitrogen-containing
compound called putrescine. Elemental analysis of putrescine indicates that it consists of
54.50% C, 13.73% H, and 31.77% N. Calculate the empirical formula of putrescine. (Hint:
Begin by assuming a 100-g sample and determining the mass of each element in that 100-g
sample.)
95: A 1.45-g sample of phosphorous burns in air and forms 2.57 g of a phosphorous oxide.
Calculate the empirical formula of the oxide. (Hint: Determine the mass of oxygen in the
2.57 g of phosphorous oxide by determining the difference in mass before and after the
phosphorous burns in air.)
93: These compounds are found in many natural flavors and scents. Calculate the empirical
formula for each compound
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Transcribed Image Text:12:51
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19: How many atoms are in each
3.4 mol Cu, 9.7*103 mol C, 22.9 mol Hg, 0.215 mol Na
25: How many moles of tin atoms are in a pure tin cup with a mass of 38.1 g?
27: A pure gold coin contains 0.145 mol of gold. What is its mass?
33: A pure silver ring contains 0.0134 mmol (milimol) Ag. How many silver atoms does it
contain?
39: How many carbon atoms are in a diamond (pure carbon) with a mass of 38 mg?
41: How many titanium atoms are in a pure titanium bicycle frame with a mass of 1.28 kg?
47: Determine the number of moles of molecules (or formula units) in each sample.
38.2 g sodium chloride, 36.5 g nitrogen monoxide, 4.25 kg carbon dioxide,
2.71 mg carbon tetrachloride
51: A mothball, composed of naphthalene (C10H8), has a mass of 1.32 g. How many
naphthalene molecules does it contain?
55: A sugar crystal contains approximately 1.8*1017 sucrose (C12H22011) molecules. What is
its mass in milligrams?
59: Determine the number of moles of CI in 2.7 mol CaCI,
67: How many grams of Cl are in 38.0 g of each sample of chlorofluorocarbons (CFCS)?
CF2C12, CFCI3, C2F3C]3, CF3CI
73: A 1.912-g sample of calcium chloride is decomposed into its constituent elements and
found to contain 0.690 g Ca and 1.222 g Cl. Calculate the mass percent composition of Ca
and Cl in calcium chloride.
79: Calculate the mass percent composition of nitrogen in each compound
N20, NO, NO2, N2O5
87: A compound containing nitrogen and oxygen is decomposed in the laboratory and
produces 1.78 g of nitrogen and 4.05 g of oxygen. Calculate the empirical formula of the
compound
91: The rotten smell of a decaying animal carcass is partially due to a nitrogen-containing
compound called putrescine. Elemental analysis of putrescine indicates that it consists of
54.50% C, 13.73% H, and 31.77% N. Calculate the empirical formula of putrescine. (Hint:
Begin by assuming a 100-g sample and determining the mass of each element in that 100-g
sample.)
95: A 1.45-g sample of phosphorous burns in air and forms 2.57 g of a phosphorous oxide.
Calculate the empirical formula of the oxide. (Hint: Determine the mass of oxygen in the
2.57 g of phosphorous oxide by determining the difference in mass before and after the
phosphorous burns in air.)
93: These compounds are found in many natural flavors and scents. Calculate the empirical
formula for each compound
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