
Concept explainers
(a)
Interpretation: The mass percentage of compound along with balanced chemical equation and formula has to be written.
Concept introduction: The mass percent of compound is given by the calculated mass of the compound to the total mass. The mass percent of compound is given by the formula,
(a)

Answer to Problem 125CP
The mass percentage of
Explanation of Solution
Given:
Record the given info
Mass of sample containing chlorine =
Mass of sample containing cobalt =
Mass of silver chloride =
Mass of cobalt (III) oxide =
The mass of samples containing chlorine and cobalt are recorded with the masses of silver chloride and cobalt (III) oxide as shown above.
To calculate the mass percent of
Molar mass of Chlorine =
Molar mass of silver chloride =
Moles of
Therefore, the mass percent of
Mass percent of
Mass percent of
The mass percent of
To calculate the mass percent of
Molar mass of cobalt =
Molar mass of cobalt (III) oxide =
Moles of
Therefore, the mass percent of
Mass percent of
The mass percent of
To calculate the mass percent of water
Molar mass of water =
Assume that 100g of compound is,
The mass percent of hydrogen and oxygen is calculated by plugging in the molar mass of water and molar masses of hydrogen and oxygen to the total mass of the sample. The molar masses of hydrogen and oxygen were found to be
The mass percentages of
(b)
Interpretation: To calculate the empirical formula of the compound
Concept introduction: The representation of simplest positive integer of a atoms in a compound is called as empirical formula.
(b)

Answer to Problem 125CP
The formula for the compound is
Explanation of Solution
To calculate the empirical formula of the compound
Out of 100 g of compound, there are
Dividing the moles by the smallest number,
The empirical formula of the compound becomes
The empirical formula of the compound is calculated by calculating the mole ratio of individual elements divide by the smallest number. The empirical formula of the compound is found to be
The empirical formula of the compound was calculated by using the mole ratio of individual elements divided by the smallest number. The empirical formula of the compound is found to be
(c)
Interpretation: To write the balanced equation of the precipitation reactions.
Concept introduction:
When two solutions containing soluble salts are mixed together, an insoluble salt so called precipitate is obtained and the reaction is called as precipitation reaction. These precipitation reactions help in the determination of various ions in the solution.’
(c)

Answer to Problem 125CP
This is redox reaction. Hence, an oxidizing agent is required and the oxidizing agent is
Explanation of Solution
To write the balanced equation of the precipitation reactions.
The reaction between cobalt chloride hexahydrate with base such as silver nitrate and sodium hydroxide yields precipitates of silver chloride and cobalt hydroxide with release of water and sodium chloride. The equation for this reaction can be given as,
Cobalt hydroxide oxidizes to cobalt (III) oxide and water.
Two moles of silver nitrate are required to react with cobalt chloride hexahydrate to give 2 moles of silver chloride as precipitate with side products being cobalt nitrate and water. Cobalt nitrate being water soluble remains inside the solution, thus precipitating silver chloride out of the solution.
Two moles of sodium hydroxide are required to react with cobalt chloride hexahydrate to give 2 moles of cobalt hydroxide with sodium chloride and water. Sodium chloride being soluble in water, dissociates as spectator ions thus remaining in the solution and a precipitate of cobalt hydroxide is precipitated out.
Cobalt hydroxide on heating is oxidized to cobalt (III) oxide with water.
The balanced form of these equations can be given as,
The reaction of heating cobalt hydroxide is
The given reactions were found to be precipitation reaction and moles on the reactant and the product were obtained. The reaction of heating cobalt hydroxide is oxidation-reduction reaction, where oxygen is used as oxidizing agent to oxidized cobalt hydroxide to cobalt (III) oxide. The balanced equations are,
Want to see more full solutions like this?
Chapter 6 Solutions
EBK CHEMISTRY: AN ATOMS FIRST APPROACH
- Which Group 1 metal reacts with O2(g) to form a metal peroxide (M2O2)? Group of answer choices Li K Rb Naarrow_forwardWhich of the following statements is true regarding the reaction between Group 1 metals and water? Group of answer choices These reactions result in a basic solution. The metals do not actually react easily with water due to the metals' lack of conductivity. These reaction result in an acidic solution. The metals need their outer coatings of metal oxides to react.arrow_forwardWhich element cannot interact with hydrogen through hydrogen bonds? Group of answer choices O S Br Narrow_forward
- Which of the following statements is false regarding hydrogen gas production? Group of answer choices Steam reforming requires a catalyst. Methanol (CH3OH) can react with water using a ZnO catalyst to form H2(g). Methanol (CH3OH) can react with O2(g) using a Pd catalyst to form H2(g). The reaction between CH4(g) and H2O to form H2(g) requires a temperature of at least 700 oCarrow_forwardWhich of the following forms of hydrogen is the least stable? Group of answer choices H H2 H− H+arrow_forwardConsider the following reduction half reactions and standard reduction potentials: Fe3+ + e− → Fe2+ Eo = +0.77 V Fe2+ + e− → Fe(s) Eo = -0.44 V Which of the following statements is true? Group of answer choices The Fe2+ reduction to Fe(s) is spontaneous. Fe2+ can disproportionate into Fe3+ and Fe(s) The Fe3+ reduction to Fe2+ is not spontaneous. Fe3+ and Fe(s) can undergo a comproportionation reaction to form Fe2+arrow_forward
- According to standard reduction potential data in Lecture 4-1, which of the following species is the most difficult to reduce? Group of answer choices Zn2+ AgCl(s) Al3+ Ce4+arrow_forwardConsider the redox reaction: 2 P4 + 8 OH− + 4 H2O → 4 PH3 + 4 HPO32− The element oxidized is ["", "", ""] , the element reduced is ["", "", ""] , one of the oxidizing agents is ["", "", ""] , and the reducing agent is ["", "", ""] .arrow_forwardWhat is the missing reactant in this organic reaction? OH H + R Δ CH3-CH2-CH-CH3 O CH3 CH3-CH2-C-O-CH-CH2-CH3 + H2O Specifically, in the drawing area below draw the condensed structure of R. If there is more than one reasonable answer, you can draw any one of them. If there is no reasonable answer, check the No answe box under the drawing area. Explanation Check Click anywhere to draw the first atom of your structure. C O2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Cerarrow_forward
- Predict the product of this organic reaction: CH3 NH2 Δ CH3-CH-CH3 + HO-C-CH2-N-CH3 P+H₂O Specifically, in the drawing area below draw the condensed structure of P. If there is no reasonable possibility for P, check the No answer box under the drawing area. Explanation Check Click anywhere to draw the first atom of your structure. Xarrow_forwardIn the scope of the SCH4U course, please thoroughly go through the second questionarrow_forwardPlease help me solve these two problems. Thank you in advance.arrow_forward
- World of Chemistry, 3rd editionChemistryISBN:9781133109655Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCostePublisher:Brooks / Cole / Cengage LearningChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
- Living By Chemistry: First Edition TextbookChemistryISBN:9781559539418Author:Angelica StacyPublisher:MAC HIGHERChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning





