Chemistry: Molybdenum (Mo) has a body centered cubic unit cell. The density of Mo is 10.28 g/cm3. Determine (a) the edge length of the unit cell and (b) the radius of a Mo atom.

Molybdenum (Mo) has a body centered cubic unit cell.

Ответ:

aprilreneeclaroxob0c

18.01.2022

Chemistry

For a: The edge length of the unit cell is 314 pm

For b: The radius of the molybdenum atom is 135.9 pm

Explanation:

For a:

To calculate the edge length for given density of metal, we use the equation:

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density = 10.28g/cm^3

Z = number of atom in unit cell = 2 (BCC)

M = atomic mass of metal (molybdenum) = 95.94 g/mol

$N_{A}$ = Avogadro's number = $6.022\times 10^{23}$

a = edge length of unit cell =?

Putting values in above equation, we get:

$10.28=\frac{2\times 95.94}{6.022\times 10^{23}\times (a)^3}\\\\a^3=\frac{2\times 95.94}{6.022\times 10^{23}\times 10.28}=3.099\times 10^{-23}\\\\a=\sqrt[3]{3.099\times 10^{-23}}=3.14\times 10^{-8}cm=314pm$

Conversion factor used: $1cm=10^{10}pm$

Hence, the edge length of the unit cell is 314 pm

For b:

To calculate the edge length, we use the relation between the radius and edge length for BCC lattice:

$R=\frac{\sqrt{3}a}{4}$

where,

R = radius of the lattice = ?

a = edge length = 314 pm

Putting values in above equation, we get:

$R=\frac{\sqrt{3}\times 314}{4}=135.9pm$

Hence, the radius of the molybdenum atom is 135.9 pm

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Ответ:

Redeyestudio53

05.12.2021

Chemistry

Answer is: sulfur, arsenic, selenium, silicon and antimony.

1) Sulfur (S) can form, for example, sulfuric acid (H₂SO₄) or acidic oxide, sulfur(VI) oxide (SO₃).

2) Arsenic (As) can form arsenous acid (H₃AsO₃).

3) Selenium (Se) can form selenic acid (H₂SeO₄).

4) Silicon (Si) can form orthosilicic acid Si(OH)₄ and metasilicic acid SiO(OH)₂.

5) Antimony (Sb) can form antimonic acid, as the hydrate HSb(OH)₆.

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Molybdenum (Mo) has a body centered cubic unit cell. The density of Mo is 10.28 g/cm3. Determine (a) the edge length of the unit cell and (b) the radius of a Mo atom.

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