Answered: The mass of a solid piece of iron Fe(s)…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter21: The Chemistry Of The Main Group Elements

Section: Chapter Questions

Problem 119IL

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The mass of a solid piece of iron Fe(s) should be determined by allowing it to react with a solution of 0.500 L potassium dichromate K2Cr2O7 (aq) in a redox reaction in acidic solution, so that all iron is oxidized into iron (II) ions, Fe2+(aq). Concomitant chromium(III) ions, Cr3+(aq), after the reduction equation:

Cr2O7 2−(aq) + 14H +(aq) + 6e − → 2Cr3+(aq) + 7H2O(l)

a) Write the complete and balanced reaction equation for the redox reaction where the piece of iron is oxidized into iron (II) ions by the dithromations in the solution.

b) A sample of the reaction solution after the oxidation of iron is completed shows that the molar concentration of Cr3+ ions is 0.0162 M. What is the calculated mass of the piece of iron Fe(s) in grams?

c) What is the amount of electrons e − in moles transmitted in this specific reaction? Calculate the electrical work wel the oxidation of the piece of iron has created in kilojoules (kJ), using the enclosed electrode potentials E 0 and the formula:

if possible, I would like handwritten answers with calculations. Thanks :)

equations and formulas are highlighted in image attachments

OPPGAVE 2 (25%)
Massen til en fast jernbit Fe(s) skal fastsettes ved å la den reagere med en oppløsning
av 0.500 L kaliumdikromat K₂Cr₂O7 (aq) i en redoksreaksjon i sur løsning, slik at alt
jern blir oksidert til jern(II)-ioner, Fe²+ (aq). Det dannes samtidig krom(III)-ioner,
Cr³+ (aq), etter reduksjonslikningen:
Cr₂0²¯(aq) + 14H*(aq) + 6e¯ → 2Cr³+ (aq) + 7H₂O(l)

a) Skriv den fullstendige og balanserte reaksjonslikningen for redoksreaksjonen hvor
jernbiten blir oksidert til jern(II)-ioner av dikromationene i løsningen.
b) En prøve av reaksjonsløsningen etter at oksideringen av jern er fullført viser at den
molare konsentrasjonen av Cr³+- ioner er 0.0162 M. Hva er den beregnede massen
av jernbiten Fe(s) i gram?
c) Hva er mengden elektroner e¯ i mol som overføres i denne spesifikke reaksjonen?
Beregn det elektriske arbeidet wel oksidasjonen av jernbiten har skapt i kilojoule
(kJ), ved å bruke vedlagte elektrodepotensialer Eº og formelen:
Wel = -ne-X Fx Ecelle
с
Oppgitt: Ecelle Ecr - Ee. F = 96 485-
=
(Faradays konstant). Energi: 1 ] = 1C XV.
'Fe
mol e-

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