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What is the total Electron Accounting Number (EAN) of one manganese atom in the compound Mn2(CO)10?
What is the total Electron Accounting Number (EAN) of one manganese atom in the compound Mn2(CO)10?
According to the 18-electron rule, how many total effective electrons should a stable metal carbonyl contain in the valence shell of one metal atom?
According to the 18-electron rule, how many total effective electrons should a stable metal carbonyl contain in the valence shell of one metal atom?
How many electrons do the five terminal carbonyl groups donate to one manganese atom in Mn2(CO)10?
How many electrons do the five terminal carbonyl groups donate to one manganese atom in Mn2(CO)10?
What does the EAN rule determine regarding the bonding of metal atoms in metal carbonyl complexes?
What does the EAN rule determine regarding the bonding of metal atoms in metal carbonyl complexes?
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In the compound Mn2(CO)10, how many electrons does the manganese-manganese bond contribute to the EAN of one manganese atom?
In the compound Mn2(CO)10, how many electrons does the manganese-manganese bond contribute to the EAN of one manganese atom?
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What is the coordination number of each manganese atom in the Mn2(CO)10 molecule?
What is the coordination number of each manganese atom in the Mn2(CO)10 molecule?
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Which type of hybridization does each manganese atom undergo in Mn2(CO)10?
Which type of hybridization does each manganese atom undergo in Mn2(CO)10?
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What is the electronic configuration of manganese in its free state?
What is the electronic configuration of manganese in its free state?
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How many of the d-orbitals remain unhybridized in each manganese atom within Mn2(CO)10?
How many of the d-orbitals remain unhybridized in each manganese atom within Mn2(CO)10?
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In the hybridization process of Mn2(CO)10, which orbital becomes vacant?
In the hybridization process of Mn2(CO)10, which orbital becomes vacant?
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What is the electronic configuration of manganese in Mn2(CO)10 after hybridization?
What is the electronic configuration of manganese in Mn2(CO)10 after hybridization?
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What type of bond is formed between the two manganese atoms in Mn2(CO)10?
What type of bond is formed between the two manganese atoms in Mn2(CO)10?
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Which molecular geometry does Mn2(CO)10 exhibit?
Which molecular geometry does Mn2(CO)10 exhibit?
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What occurs to the 4s electrons in manganese when forming the Mn2(CO)10 molecule?
What occurs to the 4s electrons in manganese when forming the Mn2(CO)10 molecule?
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Which of the following methods yields the highest percentage of Mn2(CO)10?
Which of the following methods yields the highest percentage of Mn2(CO)10?
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What is the role of the CO molecule in the formation of Mn2(CO)10?
What is the role of the CO molecule in the formation of Mn2(CO)10?
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What character does Mn2(CO)10 exhibit due to the pairing of electrons?
What character does Mn2(CO)10 exhibit due to the pairing of electrons?
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What is the effect of magnesium in the preparation of Mn2(CO)10?
What is the effect of magnesium in the preparation of Mn2(CO)10?
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What percentage yield is achieved in the carbonylation of MnCl2 in the presence of benzophenone ketyl?
What percentage yield is achieved in the carbonylation of MnCl2 in the presence of benzophenone ketyl?
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In the molecular structure of Mn2(CO)10, how many CO groups are bonded to each manganese atom?
In the molecular structure of Mn2(CO)10, how many CO groups are bonded to each manganese atom?
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What is the oxidation state of manganese in Mn2(CO)10?
What is the oxidation state of manganese in Mn2(CO)10?
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What is the melting point of Mn2(CO)10?
What is the melting point of Mn2(CO)10?
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Which halogen has the highest reactivity with Mn2(CO)10?
Which halogen has the highest reactivity with Mn2(CO)10?
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What is formed when Mn2(CO)10 is reduced with hydrogen under 200 atm pressure at 200°C?
What is formed when Mn2(CO)10 is reduced with hydrogen under 200 atm pressure at 200°C?
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What type of bond is broken when Mn2(CO)10 reacts with lithium or sodium?
What type of bond is broken when Mn2(CO)10 reacts with lithium or sodium?
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Which of the following statements is true regarding the diamagnetic nature of Mn2(CO)10?
Which of the following statements is true regarding the diamagnetic nature of Mn2(CO)10?
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Which solvent is used with sodium to break the Mn−Mn bond in Mn2(CO)10?
Which solvent is used with sodium to break the Mn−Mn bond in Mn2(CO)10?
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What type of compounds are formed when Mn2(CO)10 reacts with phosphines, arsines, and stilbines?
What type of compounds are formed when Mn2(CO)10 reacts with phosphines, arsines, and stilbines?
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What is the resultant ion when Mn2(CO)10 reacts with lithium in tetrahydrofuran?
What is the resultant ion when Mn2(CO)10 reacts with lithium in tetrahydrofuran?
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What is the electronic configuration of a free cobalt atom?
What is the electronic configuration of a free cobalt atom?
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Which hybridization occurs in the cobalt atom within the Co2(CO)8 molecule?
Which hybridization occurs in the cobalt atom within the Co2(CO)8 molecule?
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How many Co–C bonds are formed by one bridging carbonyl group in Co2(CO)8?
How many Co–C bonds are formed by one bridging carbonyl group in Co2(CO)8?
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Which of the following represents the hybridized electron orbitals in a Co atom of the Co2(CO)8 molecule?
Which of the following represents the hybridized electron orbitals in a Co atom of the Co2(CO)8 molecule?
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What is the common notation for the two types of carbonyl groups mentioned in Co2(CO)8?
What is the common notation for the two types of carbonyl groups mentioned in Co2(CO)8?
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Which of the following statements about the d2sp3 hybridization in Co is least accurate?
Which of the following statements about the d2sp3 hybridization in Co is least accurate?
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In the free state, which electron configuration is altered when cobalt forms Co2(CO)8?
In the free state, which electron configuration is altered when cobalt forms Co2(CO)8?
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How does the structure of the Co2(CO)8 molecule differ from that of a free cobalt atom?
How does the structure of the Co2(CO)8 molecule differ from that of a free cobalt atom?
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What product is formed when Co2(CO)8 is subjected to thermal decomposition at 50°C?
What product is formed when Co2(CO)8 is subjected to thermal decomposition at 50°C?
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Which of the following is a result of the action of air on Co2(CO)8?
Which of the following is a result of the action of air on Co2(CO)8?
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Under which conditions is Co2(CO)8 reduced to cobalt hydride?
Under which conditions is Co2(CO)8 reduced to cobalt hydride?
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What is the outcome of Co2(CO)8 reacting with strong bases like ammonia?
What is the outcome of Co2(CO)8 reacting with strong bases like ammonia?
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What compound is formed when Co2(CO)8 reacts with NO?
What compound is formed when Co2(CO)8 reacts with NO?
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What is the primary result of the reaction between Co2(CO)8 and halogens?
What is the primary result of the reaction between Co2(CO)8 and halogens?
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Which of the following best describes Co(CO)3NO after formation?
Which of the following best describes Co(CO)3NO after formation?
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Study Notes
Polynuclear Metal Carbonyls
- Metal carbonyls are complexes of metals bonded to carbon monoxide (CO) molecules.
- EAN Rule: The total number of electrons on the metal atom, including those gained from CO, equals the number of electrons in the next noble gas.
- Example: Mn₂(CO)₁₀. Electrons from two Mn atoms (2 × 25 = 50) + electrons from 10 CO groups (10 × 2 = 20) + electrons from one Mn-Mn bond (2) =72. Therefore, EAN of one Mn atom is 36 (same as krypton).
Alternative Method
- EAN of Mn in Mn₂(CO)₁₀ can be calculated by adding the atomic number of Mn (25) to the electrons donated by five terminal carbonyl groups (5 × 2 = 10) and the electrons from the Mn-Mn bond (1 × 2 = 2). This equals 36, corresponding to the krypton electron configuration.
18-Electron Rule
- In a stable metal carbonyl, the metal atom has 18 valence shell electrons. This number is calculated by adding the number of valence electrons in the free metal ion, twice the number of CO ligands, and twice the number of metal-metal bonds.
- Example: In Mn₂(CO)₁₀, each Mn has 18 electrons.
Structure and Bonding in Mn₂(CO)₁₀
- The structure of Mn₂(CO)₁₀ consists of two Mn pentacarbonyl groups joined by an Mn-Mn bond.
- Each Mn is bonded to five terminal CO ligands.
- The molecule is diamagnetic.
Structure and Bonding in Co₂(CO)₈
- In solution, Co₂(CO)₈ has a non-bridged structure, with each Co bonded to four terminal CO ligands and another Co through a Co-Co bond. Therefore, the EAN of each Co atom is 36.
- In the solid state, Co₂(CO)₈ possesses a bridged structure, with each Co atom bonded to three terminal CO ligands, two bridging CO groups, and another Co atom through a Co-Co bond. In the solid state, the EAN for each Co atom remains 36.
Preparations of Manganese Decacarbonyl
- Mn₂(CO)₁₀ can be prepared using several methods, for example, by carbonylation of manganese iodide with carbon monoxide and magnesium as a reducing agent, or reacting MnI₂ with magnesium in diethyl ether under high CO pressure.
- Other methods involving triethylaluminum and different reactants also exist.
Properties of Manganese Decacarbonyl
- Mn₂(CO)₁₀ is a yellow crystalline solid.
- It sublimes in a vacuum, and is soluble in organic solvents.
- It slowly oxidizes in air.
Properties of Dicobalt Octacarbonyl
- Co₂(CO)₈ is an orange-brown crystalline solid that sublimes readily.
- It's soluble in alcohol, ether, and carbon tetrachloride.
- It's air-sensitive both in the solid and liquid states.
- It decomposes at high temperatures in an inert atmosphere to form Co₄(CO)₁₂.
Reactions of Metal Carbonyls
- Various reactions can occur, such as halogenation, reduction with hydrogen, or reactions with phosphines, arines, stilbines, or NO.
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Description
This quiz covers the essential concepts of polynuclear metal carbonyls, including the Electron Activity Number (EAN) Rule and the 18-Electron Rule. Example calculations illustrate how to determine the EAN of manganese in its metal carbonyl complex. Perfect for students studying inorganic chemistry.
