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Romashka [77]
3 years ago
10

What type of chemical reaction involves 2 or more elements combining to form one?

Chemistry
1 answer:
Vikki [24]3 years ago
6 0
Hey there!

I believe the answer is Combination (or Synthesis) Reaction. 
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Calculate the energy for vacancy formation in silver, given that the equilibrium number of vacancies at 800˚C (1073 K) is 3.6 ×
krek1111 [17]

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

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