Based on the Ellingham diagram below, which metal is least stable at 400°CH,/H,0CO/Co,1088101069-101010102M-2004Fe,0,+ 0, 6Fe,0,4Cu +O, = 2Cu,02Co+ 0, 2C001022Ni + 0, = 2NIO2CO 0, 2CO.24, 0, 2H010-400+ 0, ZFe,Or2Fe+ 0, 2FeOM1010610M2Zn + 0, 2Zn0%Cr + 0,Cr,0,-6001082Mn + 0, 2MNO10MM2C+p, = 2C0101010-800Si + 0, = SiO;Ti +02 TiO101012Al + 0, = ,AL0,-1000-101410B.2Ca + 0, = 2CaO101016Change of stateMelting pointBoiling point2Mg + 0, 2M90M.Metal Oxide-1200OK 0Y1018roMB.4008001010CO/CO,Hy/H,O1200T/°C1600102020002400Pa /atm10141012102102210010100105010301024AG° = RT Imp /kJmol'o,HC 22-600M.2Mn + 0, 2MnMM.M2C+p, 2C0101010-800Si + 02 = SiO2Ti +0, TiO,101210%AI + 0, = Al,0,101410M-1000B.M.2Ca + 0, 2Cao10Y1016%3DChange of stateMelting pointBoiling point2Mg + 0, 2M90MetalOxideY1018L08M.-1200OKB40080010101200T/°C16001020CO/CO,H/H,0200024001014y10221010Po/ atm10121021010010 5010 301024O a. TiO b. MgОс. СаO d. AlAG° = RT Imp 2/kImolo,

Ellingham diagram is the plot of free energy of oxide formation of metals vs temperature. Those…

Answered: Based on the Ellingham diagram below,…

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Based on the Ellingham diagram below, which metal is least stable at 400°C

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter21: Surface Characterization By Spectroscopy And Microscopy

Section: Chapter Questions

Problem 21.10QAP

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

Based on the Ellingham diagram below, which metal is least stable at 400°C
H,/H,0
CO/Co,
108
8
10
106
9-
10
10
10
102
M
-200
4Fe,0,+ 0, 6Fe,0,
4Cu +O, = 2Cu,0
2Co+ 0, 2C00
102
2Ni + 0, = 2NIO
2CO 0, 2CO.
24, 0, 2H0
10
-400
+ 0, ZFe,Or
2Fe+ 0, 2FeO
M
10
106
10
M
2Zn + 0, 2Zn0
%Cr + 0,Cr,0,
-600
108
2Mn + 0, 2MNO
10
M
M
2C+p, = 2C0
1010
10
-800
Si + 0, = SiO;
Ti +02 TiO
10
1012
Al + 0, = ,AL0,
-1000-
1014
10
B.
2Ca + 0, = 2CaO
10
1016
Change of state
Melting point
Boiling point
2Mg + 0, 2M90
M.
Metal Oxide
-1200
OK 0
Y1018
ro
M
B.
400
800
1010
CO/CO,
Hy/H,O
1200
T/°C
1600
1020
2000
2400
Pa /atm
1014
1012
102
1022
100
10100
1050
1030
1024
AG° = RT Imp /kJmol'o,
HC

22
-600
M.
2Mn + 0, 2Mn
M
M.
M
2C+p, 2C0
1010
10
-800
Si + 02 = SiO2
Ti +0, TiO,
1012
10
%AI + 0, = Al,0,
1014
10
M
-1000
B.
M.
2Ca + 0, 2Cao
10
Y1016
%3D
Change of state
Melting point
Boiling point
2Mg + 0, 2M90
Metal
Oxide
Y1018
L08
M.
-1200
OK
B
400
800
1010
1200
T/°C
1600
1020
CO/CO,
H/H,0
2000
2400
1014
y1022
1010
Po/ atm
1012
102
10100
10 50
10 30
1024
O a. Ti
O b. Mg
Ос. Са
O d. Al
AG° = RT Imp 2/kImolo,

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