1. How many vanadium atoms are present in a unit cell if it crystallizes in a BCClattice? Note that the V atoms occupy only the lattice points.2. Silicon crystallized in a cubic structure. If the edge length of the unit cell is 543 pmand the desnity of the crystal is 2.33g/cm^3, how many Si atoms are in one unitcell?3. Aunt Julie went to the jewelry store to buy a gift for her amiga. As an auntfrom Poveda, she knows that the karat scale is based on mass percentages.She was also informed by uncle Bruno that pure gold is equivalent to 24 karat.If she bought a bracelet made of gold alloy that is 50 mol% silver and 50mol% gold, what is the karat number of the bracelet?

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Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter9: Liquids, Solids, And Materials

Section9.6: Crystalline Solids

Problem 9.12E: Crystalline polonium has a primitive cubic unit cell, lithium has a body-centered cubic unit cell,...

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Concept explainers

Alkanes and Cycloalkanes

Alkanes are saturated organic compounds which are made up of C and H atoms. Alkanes have the general formula of CnH2n+2. Alkane contains sp3 hybridized carbon atoms with four sigmas (σ) bonds & every hydrogen atom is connected with one of the carbon atoms. The size of the alkane could be determined by the number of carbon atoms located in it.

Question

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1. How many vanadium atoms are present in a unit cell if it crystallizes in a BCC
lattice? Note that the V atoms occupy only the lattice points.
2. Silicon crystallized in a cubic structure. If the edge length of the unit cell is 543 pm
and the desnity of the crystal is 2.33g/cm^3, how many Si atoms are in one unit
cell?
3. Aunt Julie went to the jewelry store to buy a gift for her amiga. As an aunt
from Poveda, she knows that the karat scale is based on mass percentages.
She was also informed by uncle Bruno that pure gold is equivalent to 24 karat.
If she bought a bracelet made of gold alloy that is 50 mol% silver and 50
mol% gold, what is the karat number of the bracelet?

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