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
Doss [256]
3 years ago
12

A sheet of steel 2.5-mm thick has nitrogen atmospheres on both sides at 900°C and is permitted to achieve a steady-state diffusi

on condition. The diffusion coefficient for nitrogen in steel at this temperature is 1.85 × 10–10 m2/s, and the diffusion flux is found to be 1.0 × 10–7 kg/m2.s. Also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 2 kg/m3. How far into the sheet from this high-pressure side will the concentration be 0.5 kg/m3
Chemistry
1 answer:
alisha [4.7K]3 years ago
4 0

Explanation:

It is known that relation between diffusion flux (J_{N_{2}}) and the diffusion coefficient of N_{2} (D_{N_{2}}) for the linear concentration profile at the steady state is as follows.

       J_{N_{2}} = -D_{N_{2}} \times \frac{C_{2} - C_{1}}{x_{2} - x_{1}}

The negative sign shows that along the positive x-direction there occurs drop in concentration.

where,   C_{1} and C_{2} are the concentrations of N_{2} at position 1 and 2 on steel sheet.

              x_{1} and x_{2} are the distances corresponding to distances on the sheet.

Now, putting the given values into the above formula as follows.

     J_{N_{2}} = -D_{N_{2}} \times \frac{C_{2} - C_{1}}{x_{2} - x_{1}}  

     1 \times 10^{-7} kg/m^{2}s = -1.85 \times 10^{-10} m^{2}/s \times \frac{0.5 kg/m^{3} - 2 kg/m^{3}}{x_{2} - 0}

                x_{2} - 0 = 0.00275 m

                       x_{2} = 2.75 mm

Thus, we can conclude that 2.75 mm far into the sheet from given high-pressure side will the concentration be 0.5 kg/m^{3}.

You might be interested in
The iodide ion concentration in a solution may be determined by the precipitation of lead iodide. Pb2 (aq) 2I-(aq) PbI2(s) A stu
MatroZZZ [7]

Answer:

M_{I^-}=0.6841M

Explanation:

Hello.

In this case, since the precipitation of the lead iodide is related to the iodide ion in solution, if we make react lead (II) nitrate with an iodide-containing salt, a possible chemical reaction would be:

Pb(NO_3)_2+2I^-\rightarrow PbI_2+2NO_3^-

In such a way, since 15.71 mL of a 0.5770-M solution of lead (II) nitrate precipitates out lead (II) iodide, we can first compute the moles of lead (II) nitrate in the solution:

n_{Pb(NO_3)_2}=0.5570\frac{molPb(NO_3)_2}{L}*0.01571L=0.01393molPb(NO_3)_2

Next, since there is a 1:2 mole ratio between lead (II) nitrate and iodide ions, we compute the moles of those ions:

n_{I^-}=0.01393molPb(NO_3)_2*\frac{2molI^-}{1molPb(NO_3)_2} =0.02785molI^-

Finally, since the mixing of the two solutions produce a final volume of 40.71 mL (0.04071 L), the resulting concentration (molarity) of the iodide ions in the student's unknown turns out:

M_{I^-}=\frac{0.02785molI^-}{0.04071L}\\\\ M_{I^-}=0.6841M

Best regards!

5 0
3 years ago
Where is the intersection of the position and time axes located on a position-versus-time graph?
Bad White [126]

it is located at the origin so A

hope this helped ^_^

5 0
3 years ago
Create a time that marks important events during the Precambrian Supereon.
Maurinko [17]
I really hope this help!!
8 0
3 years ago
Read 2 more answers
Nuclear power plants have the greatest environmental impact during __________. A) operation B) mining C) waste disposal D) const
lyudmila [28]
The correct option is C.
The issue of disposal of waste of nuclear power plants has been a controversial issue for long because of the hazardous effects which these wastes have on human health and the environment. Most of the waste are usually long lived radioactive wastes which can remain active for a very long time and which have detrimental effect on both the environment and the human health.<span />
5 0
3 years ago
Read 2 more answers
Which of the following is an example of chemical energy being used?
adelina 88 [10]
A. Because the chemicals in the battery are being converted to light and heat energy from the bulb!
3 0
3 years ago
Read 2 more answers
Other questions:
  • A quantity of 0.225 g of a metal M (molar mass = 27.0 g/mol) liberated 0.303 L of molecular hydrogen (measured at 17°C and 741 m
    14·1 answer
  • The following equation is one way to prepare oxygen in a lab. 2KClO3 → 2KCl + 3O2 Molar mass Info: MM O2 = 32 g/mol MM KCl = 74
    12·2 answers
  • For each of these equations, determine the change in the number of moles of gas, δngas.?
    11·1 answer
  • How many moles are in 6.5g of carbonate​
    5·1 answer
  • How many atoms are in oxygen
    5·1 answer
  • Hot coffee is stirred with a spoon, the spoon gets hot due to
    6·1 answer
  • $4000 principal earning 6% compounded annually. what will the balance be after 6 years
    5·1 answer
  • Do u have a name or can i call u mine, notice how i put chemistry :) <br><br> jk jk
    12·1 answer
  • An unknown compound has the following chemical formula: NO_x
    12·1 answer
  • Read the chemical equation.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!