Chemistry Exam  >  Chemistry Questions  >  Iron (II) oxide, FcO, crystal has a cubic str... Start Learning for Free
Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.
  • a)
    Fe2+: 4; O2–: 4
  • b)
    Fe2+: 3; O2–: 3
  • c)
    Fe2+: 1; O2–: 1
  • d)
    Fe2+: 3; O2–: 4
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Iron (II) oxide, FcO, crystal has a cubic structure and each edge of t...
View all questions of this test
Most Upvoted Answer
Iron (II) oxide, FcO, crystal has a cubic structure and each edge of t...
Angstroms long. The density of FeO is 5.7 g/cm3. Calculate the number of Fe and O atoms in one unit cell.

First, we need to calculate the volume of one unit cell:

Volume = (edge length)3 = (5.0 angstroms)3 = 125 angstroms3

Next, we need to convert the volume to cubic centimeters (cm3) so that we can use the density to calculate the mass of the unit cell:

1 angstrom = 10^-8 cm

Volume = 125 angstroms3 x (10^-8 cm/angstrom)^3 = 1.25 x 10^-22 cm3

Now we can calculate the mass of the unit cell:

Density = mass/volume

mass = density x volume = (5.7 g/cm3) x (1.25 x 10^-22 cm3) = 7.125 x 10^-22 g

Next, we need to calculate the number of atoms in the unit cell. Iron has a molar mass of 55.85 g/mol, and oxygen has a molar mass of 16.00 g/mol. The formula for FeO tells us that there is one iron atom and one oxygen atom in each unit of FeO.

Number of Fe atoms = (mass of Fe/molar mass of Fe) = (55.85 g/mol)/(7.125 x 10^-22 g) = 7.84 x 10^21

Number of O atoms = (mass of O/molar mass of O) = (16.00 g/mol)/(7.125 x 10^-22 g) = 2.25 x 10^22

Therefore, there are approximately 7.84 x 10^21 iron atoms and 2.25 x 10^22 oxygen atoms in one unit cell of FeO.
Explore Courses for Chemistry exam
Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer?
Question Description
Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer?.
Solutions for Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry. Download more important topics, notes, lectures and mock test series for Chemistry Exam by signing up for free.
Here you can find the meaning of Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Iron (II) oxide, FcO, crystal has a cubic structure and each edge of the unit cell is 5.0 Å. Taking density of the oxide as 4.0 g cm–3. Calculate the no. of Fe2+ and O2– ions present in each unit cell.a)Fe2+: 4; O2–: 4b)Fe2+: 3; O2–: 3c)Fe2+: 1; O2–: 1d)Fe2+: 3; O2–: 4Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Chemistry tests.
Explore Courses for Chemistry exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev