1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dimaraw [331]
3 years ago
13

Calculate the energy for vacancy formation in silver, given that the equilibrium number of vacancies at 800˚C (1073 K) is 3.6 ×

1023 m-3 . The atomic weight and density (at 800˚C) for silver are, respectively, 107.9 g/mol and 9.5 g/cm3 .
Chemistry
2 answers:
____ [38]3 years ago
5 0

Answer:

The energy for vacancy formation in silver is 1.1 ev/atom

Explanation:

The total number of sites is equal to:

N=\frac{N_{A} \rho }{A}

Where

NA = Avogadro´s number = 6.023x10²³atom/mol

A = atomic weight of silver = 107.9 g/mol

ρ = density of silver = 9.5 g/cm³

Replacing:

N=\frac{6.023x10^{23}*9.5 }{107.9} =5.3x10^{22} atom/cm^{3} =5.3x10^{28} m^{-3}

The energy for vacancy is equal:

Q=-RTln(\frac{N_{v} }{N} )

Where

R = 8.314 J/mol K = 8.614x10⁻⁵ev/atom K

T = 800°C = 1073 K

Nv = number of vacancy = 3.6x10²³m⁻³

Replacing:

Q=-8.614x10^{-5} *1073*ln(\frac{3.6x10^{23} }{5.3x10^{28} } )=1.1ev/atom

krek1111 [17]3 years ago
4 0

Answer : The energy for vacancy formation in silver is, 1.762\times 10^{-19}J

Explanation :

Formula used :

N_v=N\times e^{(\frac{-E}{K\times T})}

or,

N=\frac{N_A\times \rho}{M}

So,

N_v=[\frac{N_A\times \rho}{M}]\times e^{(\frac{-E}{K\times T})}

where,

N_v = equilibrium number of vacancies = 3.6\times 10^{23}m^{-3}=3.6\times 10^{20}L^{-1}

E = energy = ?

M = atomic weight = 107.9 g/mole

N_A = Avogadro's number = 6.022\times 10^{23}mol^{-1}

\rho = density = 9.5g/cm^3=9.5g/ml=9500g/L

T = temperature = 800^oC=273+800=1073K

K = Boltzmann constant = 1.38\times 10^{-23}J/K

Now put all the given values in the above formula, we get:

3.6\times 10^{20}L^{-1}=[\frac{(6.022\times 10^{23}mol^{-1})\times 9500g/L}{107.9g/mol}]\times e^{[\frac{-E}{(1.38\times 10^{-23}J/K)\times 1073K}]}

E=1.762\times 10^{-19}J

Therefore, the energy for vacancy formation in silver is, 1.762\times 10^{-19}J

You might be interested in
Calculate the mass of 140g of Cl2
spin [16.1K]

Answer:

6amu

Explanation:

mass=proton+neutron

mass of cl2=2(16+16)=64amu

8 0
3 years ago
A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane, n the mixture is 330 mm Hg and
Thepotemich [5.8K]
b is the correct answer
4 0
3 years ago
Read 2 more answers
Why are noble gases, like helium and krypton, unlikely to form a bond?
fredd [130]

Answer:

The valence electrons are the only parts of an atom that make chemical bonds. Noble gases don't form chemical bonds because they have a full outer shell (8 electrons).

5 0
2 years ago
For an isoelectronic series of ions, the ion that is the smallest is always 1. the ion with the most electrons. 2. the ion with
Sophie [7]

Answer:

the ion with the most electrons

Explanation:

Ionic size generally depends on weather the ions are negative or positive. Averagely, atoms become smaller on moving from left to right in the periodic table. A movement from left to right in the periodic table leads to a gradual increase in the number of electrons and decrease in atomic size. Li+, Be2+ and B3+ are all isoelectronic but B3+ is the smallest ion.

7 0
3 years ago
Loam is a soil texture that is composed of what
finlep [7]
Loam<span> is </span>soil composed<span> mostly of sand (particle size > 63 µm), silt (particle size > 2 µm), and a smaller amount of clay (particle size < 2 µm)</span>
6 0
3 years ago
Other questions:
  • Express in scientific notation. Choose the answer with the proper number of significant figures.
    8·1 answer
  • How is 0.246¯¯¯¯ written as a fraction in simplest form?
    14·1 answer
  • 8. The oxidation number of magnesium in magnesium chloride is _____.
    10·2 answers
  • What is a closed system in chemistry? What is an open system in chemistry? plzz dont make the answer too smart so dumb it down a
    7·1 answer
  • Which is made by weathering?<br><br><br> A. sediments<br> B. minerals<br> C. ash<br> D. magma
    12·1 answer
  • I need help with 2, 3, and 4 please help i will give the brainliest
    9·1 answer
  • What happens when an atom crashes against another atom?
    11·1 answer
  • For the following reaction, 38.3 grams of sulfuric acid are allowed to react with 33.5 grams of calcium hydroxide sulfuric acid(
    15·1 answer
  • A 1.038 g sample of unknown containing C, H, and O yielded 2.48 g of CO2 and 0.510 g of H2O during combustion analysis. Determin
    13·1 answer
  • A voltaic cell using Cu/Cu²⁺ and Sn/Sn²⁺ half-cells is set up at standard conditions, and each compartment has a volume of 345 m
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!