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
Natasha2012 [34]
3 years ago
12

The diffusion coefficients for species A in metal B are given at two temperatures:

Engineering
1 answer:
Kruka [31]3 years ago
5 0

Answer:

a) 149 kJ/mol, b) 6.11*10^-11 m^2/s ,c) 2.76*10^-16 m^2/s

Explanation:

Diffusion is governed by Arrhenius equation

D = D_0e^{\frac{-Q_d}{RT} }

I will be using R in the equation instead of k_b as the problem asks for molar activation energy

I will be using

R = 8.314\ J/mol*K

and

°C + 273 = K

here, adjust your precision as neccessary

Since we got 2 difusion coefficients at 2 temperatures alredy, we can simply turn these into 2 linear equations to solve for a) and b) simply by taking logarithm

So:

ln(6.69*10^{-17})=ln(D_0) -\frac{Q_d}{R*(1030+273)}

and

ln(6.56*10^{-16}) = ln(D_0) -\frac{Q_d}{R*(1290+273)}

You might notice that these equations have the form of  

d=y-ax

You can solve this equation system easily using calculator, and you will eventually get

D_0 =6.11*10^{-11}\ m^2/s\\ Q_d=1.49 *10^3\ J/mol

After you got those 2 parameters, the rest is easy, you can just plug them all   including the given temperature of 1180°C into the Arrhenius equation

6.11*10^{-11}e^{\frac{149\ 000}{8.143*(1180+273)}

And you should get D = 2.76*10^-16 m^/s as an answer for c)

You might be interested in
Which of the following is MOST likely to be true about a service manager?
forsale [732]

Answer:

a.they are responsible for the function of the service department

7 0
2 years ago
Technician A says that latent heat is hidden heat and cannot be measured on a thermometer. Technician B says that latent heat is
AysviL [449]

Answer: C

Both A and B are correct

Explanation:

Latent heat is the hidden heat.

Latent heat is the heat energy required to change one state of matter to another state of matter without change in temperature. For example, solid state to liquid state, or liquid state to gaseous state.

Thermometer can not detect the latent heat. That is why it is called hidden heat.

If Technician A says that latent heat is hidden heat and cannot be measured on a thermometer. And Technician B says that latent heat is hidden heat that is required for a change of state of matter, then we can therefore conclude that both Technician A and Technician B are correct.

5 0
3 years ago
What is the term for removing refrigerant in any condition from a system and storing it in an external container without necessa
Vlad [161]

Answer:

The term you are looking for is recovery. The process of recovering refrigerant is to remove some or all the refrigerants of a system and deposit it in an external storing for further processing or storage. This recovered refrigerant won´t be used again in the system in any near time period.

If the refrigerant is removed to be instantly processed and cleaned to be reutilized in the same system, this action is known as recycling.

8 0
3 years ago
Technician A says that squeeze-type resistance spot welding (STRSW) may be used on open butt joints. Technician B says that repl
Mamont248 [21]

Answer:

B only

Explanation:

Squeeze-type resistance spot welding (STRSW)is a type of electric resistance welding that brings about the weld on interfacing sheet metal pieces through which heat generated from electric resistance bring about fusion and welding of the two pieces together

Therefore, it is not meant for opening but joints but it can be used for making replacement spot welds adjacent to the original spot weld due to the smaller heat affected zone (HAZ) created by the STRSW process.

6 0
3 years ago
Multiple Choice
mote1985 [20]
I think it’s manufacturing
7 0
3 years ago
Other questions:
  • Whenever you are around construction sites, you should A speed up so you get through it quicker and avoid falling rocks B maneuv
    10·1 answer
  • Please answwr the above question screenshot.​
    15·1 answer
  • C programming fundamentals for everyone​
    13·1 answer
  • Which of the following describes a product concept?
    15·1 answer
  • Please what is dif<br>ference between building technology and building engineering.​
    14·2 answers
  • Connecting rods undergo a process to alleviate manufacturing stresses from forging, a process known as ______.​
    7·1 answer
  • Does an electronic clock use electrical energy?​
    10·2 answers
  • What are some sources of resistance? (Check all
    5·1 answer
  • A jointed arm robot can rotate on the following 6 axes?
    8·1 answer
  • Identify three questions a patient might ask of the nuclear medicine technologist performing a nuclear medicine exam.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!