Concept explainers
How many atoms (or ions) of each element are in 140.0 g of the following substances?
(a)
Interpretation:
The number of atoms (or ions) present in
Explanation of Solution
The number of formula units present is determined as follows.
Here,
The number of atoms is determined as follows.
By combining equations (1) and (2), the number of atoms can be determined as follows.
The molar mass of one mole of
In the
Similarly, the number of sulfate ions is calculated as follows.
Therefore, there are
The total number of barium and sulfate ions in
(b)
Interpretation:
The number of atoms (or ions) of each element present in
Explanation of Solution
The molar mass of one mole of
In the
Similarly, the number of phosphate ions is calculated as follows.
Therefore, there are
The total number of potassium and bromide ions in
(c)
Interpretation:
The number of atoms of each element present in
Explanation of Solution
The molar mass of two moles of
Therefore, there are
(d)
Interpretation:
The number of ions of each element present in
Explanation of Solution
The molar mass of one mole of
In the
Similarly, the number of sulfate ions is calculated as follows.
Therefore, there are
The total number of potassium and bromide ions in
Want to see more full solutions like this?
Chapter 4 Solutions
EBK INTRODUCTION TO CHEMISTRY
- Express the composition of each of the following compounds as the mass percents of its elements. a. formaldehyde, CH2O b. glucose, C6H12O6 c. acetic acid, HC2H3O2arrow_forwardHow many moles of nitrogen atoms are present in 3.00-mole samples of each of the following compounds? a. S2N2 b. S4N4 c. NSF d. N4S4Cl4arrow_forwardWhat is the mass, in grams, of 1.000 mole of each of the following substances? a. Ca (calcium) b. Ag (silver) c. NO (nitric oxide) d. HNO3 (nitric acid)arrow_forward
- 1. Which of the following hydrocarbons has the highest mass percentage of carbon? methane, CH4 ethane, C2H6 propane, C3H8 butane, C4H10arrow_forwardThe sugar sucrose, which is present in many fruits and vegetables, reacts in the presence of certain yeast enzymes to produce ethanol and carbon dioxide gas. Balance the following equation for this reaction of sucrose. C12H22O11(aq) + H2O(l) C2H5OH(aq) + CO2(g)arrow_forwardopical hydrocortisone is often used to treat a variety of skin conditions, such as insect bites, eczema, and rashes. Each molecule of hydrocortisone contains 21 atoms of carbon (plus other atoms). The mass percentage of carbon in hydrocortisone is 69.5 8%. What is the molar mass of hydrocortisone?arrow_forward
- What amount (moles) is represented by each of these samples? a. 20.0 mg caffeine, C8H10N4O2 b. 2.72 1021 molecules of ethanol, C2H5OH c. 1.50 g of dry ice, CO2arrow_forwardYou have a pure sample of apholate, C12H24N9P3, a highly effective commercial insecticide. Calculate the molar mass of apholate. Calculate the mass of N in 100. g apholate. A sample containing 250.0 mg apholate is sprayed on an agricultural field. Calculate the mass of phosphorus in this sample of apholate; express your result in grams. Calculate the number of phosphorus atoms in this sample of apholate.arrow_forwardA compound R2O3 is 32.0% oxygen. What is the molar mass of R2O3? What is the element represented by R?arrow_forward
- Which of the following compounds has the highest mass percent of chlorine? (a) BCl3 (b) AsCl3 (c) GaCl3 (d) AlCl3 (e) PCl3arrow_forwardWhat is the mass, in grams, of 1.000 mole of each of the following substances? a. S (sulfur) b. Mg (magnesium) c. NH3 (ammonia) d. H2SO4 (sulfuric acid)arrow_forwardThe active ingredient in Pepto-Bismo® (an over- the-counter remedy for an upset stomach) is bismuth sub-salicylate, C7H5BiO4. Analysis of a 1.7500-g sample of Pepto-Bismol yields 346 mg of bismuth. What percent by mass is bismuth subsalicylate in the sample? (Assume that there are no other bismuth-containing compounds in Pepto-Bismol.)arrow_forward
- Chemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage LearningGeneral, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning
- Chemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning