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Ede4ka [16]
3 years ago
13

(1.7 x 10-5 m) x (3.72 x 10-4 m) *

Chemistry
1 answer:
rosijanka [135]3 years ago
7 0

Answer:

The answer will be 1992/5 or 398.4

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a metallic object with atoms in a face-centered cubic unit cell with an edge length of 392 pm has a density of 21.45 g/cm^3. cal
lesya692 [45]

The metal = Platinum(Pt)

<h3>Further explanation</h3>

FCC : Face centered cubic : the unit structures of the unit cell((other than BCC, HCP)

In FCC ⇒ atoms on every corner and side (total 4 atoms)

The length of the face diagonal (b) = 4 times the atomic radius  (r)

Formula :

\tt b=4r

\tt a=r\sqrt{8}

\tt V=16r\sqrt{2}=a^3

\tt \rho=\dfrac{n.Ar}{V.No}

Ar = atomic mass, g/mol

No = Avogadro number = 6.02.10²³

n = number of atoms

V = volume (cm³)

a = side length  

b = diagonal of the side surface  

r = atomic radius

a= 392 pm=3.92 x 10⁻⁸ cm

ρ = 21.45 g/cm³

\tt V=a^3\\\\V=(3.92\times 10^{-8})^3\\\\V=6.024\times 10^{-23}~cm^3

The atomic mass :

\tt 21.45~g/cm^3=\dfrac{4\times Ar}{6.024\times 10^{-23}\times 6.02\times 10^{23}}\\\\Ar=194.47\approx 195~g/mol

radius :

\tt a=r\sqrt{8}\\\\3.92\times 10^{-8}=r\sqrt{8}\\\\r=1.386\times 10^{-8}~cm

Element with atomic mass 195 g/mol and radius = 139 pm (1.386x10⁻⁸cm) = Platinum(Pt)

3 0
3 years ago
Write a word or phrase begining with each letter of the word CHANGE that describes changed you have observed in everyday objects
ipn [44]
C – coming to senses and finally realized that everything is dynamic and I should learn to invest into knowing what of these changes are right or wrong and being

H – hopeful that someday, these changes will actually make sense and that all of these questions and confusions will be answered in the right time and the right place. But whatever happens, I must learn to

A – adapt from the different things I see everyday, If the world changes for its betterment or for its worse, then I too, should change as well to go with the flow. However, keep in mind to

N – never leave the small things behind because these things when summed up actually what make sense of everything and could possibly answer the

G – growing dynamics of the world and its inhabitants. Throughout all this, it is always important to
<span>
E-educate yourself, that when the change will finally take effect on you, you will be ready.</span>
6 0
3 years ago
A sentence with the word atom
Sati [7]

Answer:

we use atom in our sentences all the time

Explanation:

that what i put

8 0
3 years ago
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The human eye cannot see anything less than 40 micrometers in size. What is this length in meters?
Agata [3.3K]

Answer:

4e-5 is the length in meters

Have a nice day! :)

6 0
3 years ago
Do you agree or disagree with the statement: "A rise of -7°C" means "a fall of 7°C"? Explain.
vazorg [7]

Answer:

i would agree

Explanation:

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