Q2a Calculate the lattice constant and the atomic packing factor, APF.and the theoreticaldensity for Aluminum forms an FCC structure and has an atomic radius of 0.143 nm.b- The atomic radius of an iron atom is 1.238 * 10-10 m. Iron crystallizes as BCC. Calculatethe lattice parameter of the unit cell, a. How many atoms are contained within the Bccunit cell ? Also find the atomic packing factor and compare it it if iron have FCC structure

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Q2 a Calculate the lattice constant and the atomic packing factor, APF.and the theoretical density for Aluminum forms an FCC structure and has an atomic radius of 0.143 nn m.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.

Question

Q2
a Calculate the lattice constant and the atomic packing factor, APF.and the theoretical
density for Aluminum forms an FCC structure and has an atomic radius of 0.143 nm.
b- The atomic radius of an iron atom is 1.238 * 10-10 m. Iron crystallizes as BCC. Calculate
the lattice parameter of the unit cell, a. How many atoms are contained within the Bcc
unit cell ? Also find the atomic packing factor and compare it it if iron have FCC structure

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The P=T phase diagram of iron(Fe) is shown below, where the - Fe and -Fe phases are in body-centered cubic(bcc) structure, while the - Fe is in Face-centered cubic(fcc) structure. (a) Draw schematic G-T diagrams of Fe at 1 and 10^-8 atm and the G-P diagram at 1500 C. (b) Please draw schematic H-T and S-T diagrams of Fe at 1 atm. (d) Please draw schematic G-T and G-P diagrams of Fe at the fcc-liquid-Vapor triple point. (e) Please estimate the enthalpy change and entropy change of one mole of Fe being heated from 30 to 1500 °°℃. (f) Please estimate the enthalpy changes of one mole of fe under the → phase transformation at 500 and 1200 °C. (e) Please calculate the heat of evaporation of Fe at the normal boiling temperature. (h) Please explain why the phase boundaries of,, and /liquid equilibria are much steeper than those with the vapor phase in the phase diagram. Note: Please make sure the slopes and curvatures are with physical meanings
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