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
grin007 [14]
3 years ago
10

An FCC iron-carbon alloy initially containing 0.20 wt% C is carburized at an elevated temperature and in an atmosphere wherein t

he surface carbon concentration is maintained at 1.0 wt%. If after 48 h the concentration of carbon is 0.35 wt% at a position 3.9 mm below the surface, determine the temperature at which the treatment was carried out. You will need to use data in the two tables below to solve this problem.
Chemistry
1 answer:
gavmur [86]3 years ago
4 0

Answer:

Hello the table required is missing attached below is the missing table

Answer : <em>1299.05 k</em>

Explanation:

Given data :

concentration of carbon ( Cx ) at a position 3.9mm below surface = 0.35

concentration of carbon ( Co ) = 0.20

surface carbon ( Cs ) = 1

<u>Determine the temperature at which the treatment was carried out </u>

first we will determine the value of Z in the table attached

given that the value of erf ( Z ) for Z = 0.8125 from the table

= \frac{Z- 0.9}{0.95-0.9}  = \frac{0.8125-0.797}{0.8209-0.797}

 make Z subject of the equation

Z = 0.932

next calculate the diffusion coefficient using the relation below

Z = \frac{x}{2\sqrt{Dt} }   ----- ( 1 )  where ; z = 0.932 , x = 3.9 mm , t = 48h

0.932 =

x = 3.9 mm = 0.0039 m

t = 48 h = ( 48 *60* 60 ) = 172800 secs

Insert values into equation 2

0.932 = \frac{0.0039}{2\sqrt{D * 172800} }  

\sqrt{D*172800} = (0.0039 / 0.932 ) / 2

      172800 * D  =( 0.0021 )^2

therefore D = 2.55 * 10^-11 m^2/s

Finally calculate the temperature at which the treatment was carried out

D = Do exp(\frac{-Qd}{RT} )  ----- ( 3 )

D = 2.55 * 10^-11 m^2/s ,

Do = 2.3*10^-5  m^2/s ( gotten from Diffusion data table )

Qd = 148000 J/mol ( gotten from Diffusion data table )

R = 8.31 J/mol k ( gotten from Diffusion data table )

back to equation 3

D / Do = exp ( -17810 / T )

1.11 * 10^-6 = exp ( -17810 / T )

therefore T =  -17810 / ln( 1.11 * 10^-6 )

                   = - 17810 / -13.71  =  <em> 1299.05 k</em>

You might be interested in
Why was UwU createdwwwwwwwwwwwwwwwwwwwwwwwwwwwww
photoshop1234 [79]

a typable representation of emotion

5 0
2 years ago
Draw one representation that shows the intermolecular interactions between NH_3 and water and another that shows the intermolecu
Lera25 [3.4K]

Answer:

NH3 has greater water solubility due to intermoleculate interactions

Explanation:

Hi:

If we represent the structures of NH3 and SbH3 we can see that they are similar to the naked eye, this is because N and Sb belong to the same group of the periodic table (group 15).

However, the electronegativity of N is greater than that of Sb. The NH3 molecule is polar and can form an intermolecular interaction called hydrogen bridge with water.

Sb is less electronegative than N. The SBH3 molecule forms an intermolecular interaction with water called dipole-induced dipole.

The zone with positive charge density of the water molecule (hydrogens) is oriented towards the zone with positive charge density of SBH3 (the pair of electrons not shared)

Stronger intermolecular junctions allow greater solubility of NH3 molecules.

Successes in your homework

Download pdf
5 0
3 years ago
The reaction is proceeding at a rate of 0.0080 Ms-1 in 50.0 mL of solution in a system with unknown concentrations of A and B. W
Leokris [45]

Answer:

0.0010 mol·L⁻¹s⁻¹  

Explanation:

Assume the rate law is  

rate = k[A][B]²

If you are comparing two rates,

\dfrac{\text{rate}_{2}}{\text{rate}_{1}} = \dfrac{k_{2}\text{[A]}_2[\text{B]}_{2}^{2}}{k_{1}\text{[A]}_1[\text{B]}_{1}^{2}}= \left (\dfrac{\text{[A]}_{2}}{\text{[A]}_{1}}\right ) \left (\dfrac{\text{[B]}_{2}}{\text{[B]}_{1}}\right )^{2}

You are cutting each concentration in half, so

\dfrac{\text{[A]}_{2}}{\text{[A]}_{1}} = \dfrac{1}{2}\text{ and }\dfrac{\text{[B]}_{2}}{\text{[B]}_{1}}= \dfrac{1}{2}

Then,

\dfrac{\text{rate}_{2}}{\text{rate}_{1}} = \left (\dfrac{1}{2}\right ) \left (\dfrac{1}{2}\right )^{2} = \dfrac{1}{2}\times\dfrac{1}{4} = \dfrac{1}{8}\\\\\text{rate}_{2} = \dfrac{1}{8}\times \text{rate}_{1}= \dfrac{1}{8}\times \text{0.0080 mol$\cdot$L$^{-1}$s$^{-1}$} = \textbf{0.0010 mol$\cdot$L$^{-1}$s$^{-1}$}\\\\\text{The new rate is $\large \boxed{\textbf{0.0010 mol$\cdot$L$^\mathbf{{-1}}$s$^{\mathbf{-1}}$}}$}

8 0
3 years ago
A precipitate is a solid that sometimes forms when two liquids combine.<br> A true <br> B False
r-ruslan [8.4K]
<h2>Question:</h2>

A precipitate is a solid that sometimes forms when two liquids combine.

<h2>Answer:</h2>

<u>A</u><u>.</u><u> </u><u>True</u><u> </u>

<h2>Explanation:</h2>
  • <u>Because</u><u> </u><u>the</u><u> </u><u>Precipitate</u><u> </u><u>it's</u><u> </u><u>forms</u><u> </u><u>solid</u><u> </u><u>when</u><u> </u><u>two</u><u> </u><u>liquids</u><u> </u><u>combine</u><u> </u><u>to</u><u> </u><u>precipitate</u><u>.</u><u> </u>

<h2><u>#CARRYONLEARNING</u><u> </u></h2><h2><u>#STUDYWELL</u><u> </u></h2>
3 0
3 years ago
Read 2 more answers
What is the best conclusion according to the energy diagram of the chemical reaction?
Mariulka [41]

"The reaction will absorb energy" is the best conclusion according to the energy diagram of the chemical reaction.

<u>Option: B</u>

<u>Explanation:</u>

The chemical bonds in the reactions are broken and formed as per process and contributed by three major steps: reactants, transition phase and product formation. Here transition phase is in equilibrium stage drived by activation energy, where bond is partially formed and partially broken, located at higher energy level then the starters.

The reactant's energy level is less relative to the products as seen in the endothermic reactions' energy diagram, which depicts that  the products are less balanced than reactants. Here when the reaction is forced to the forward direction, then it direct towards the more unbalance entities. As energy is absorbed in the endothermic reaction from surrounding, thus the enthalpy change (ΔH) for the reaction is positive.

5 0
3 years ago
Other questions:
  • What can affect the properties of a substance?
    9·1 answer
  • How many grams of glucose, C6H12O6, in 2.47 mole?
    8·2 answers
  • Place these hydrocarbons in order of decreasing boiling point. Compound Structure butane CH3CH2CH2CH3 pentane CH3CH2CH2CH2CH3 2,
    10·1 answer
  • Ravi cow gives 2 1/4 gallon Milk each day . How much is this in quarts
    6·1 answer
  • Which statements describe an interaction between the biosphere and the atmosphere related to photosynthesis? Select 2 correct ch
    15·2 answers
  • A gradual change over time in a species that enables the species to better survive in its environment is known as a(n)
    8·2 answers
  • propose a synthetic route for the synthesis of a named alkanal starting with ethyl formate and grignard reagent. ​
    6·1 answer
  • How long does it take light to travel from the Earth to the Sun? The speed of light is 2.998×10^5 km/s and the Sun is 1.496×10^8
    6·1 answer
  • Read through the literacy task
    12·1 answer
  • _______ can travel through solid, liquid, and gaseous materials, whereas _______ can travel only through solid materials.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!