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
14

Zinc is to be electroplated onto both sides of an iron sheet that is 20 cm2 as a galvanized sacrificial anode. It is desired to

electroplate the zinc to a thickness of 0.025 mm. It is found that a current of 20 A produces a zinc coating of sufficient quality for galvanized iron. Determine the time required to produce the desired coating, assuming 100 % efficiency.
Chemistry
1 answer:
Alexandra [31]3 years ago
8 0

Answer:

The time required for the coating is 105 s

Explanation:

Zinc undergoes reduction reaction and absorbs two (2) electron ions.

The expression for the mass change at electrode (m_{ch}) is given as :

\frac{m_{ch}}{M} ZF = It

where;

M = molar mass

Z = ions charge at electrodes

F = Faraday's constant

I = current

A = area

t = time

also; (m_{ch}) = (Ad) \rho ; replacing that into above equation; we have:

\frac{(Ad) \rho}{M} ZF = It  ---- equation (1)

where;

A = area

d = thickness

\rho = density

From the above equation (1); The time required for coating can be calculated as;

[ \frac{20 cm^2 *0.0025 cm*7.13g/cm^3}{65.38g/mol}*2 \frac{moles\ of \ electrons}{mole \ of \ Zn} * 9.65*10^4 \frac{C}{mole \ of \ electrons }  ] = (20 A) t

t = \frac{2100}{20}

= 105 s

You might be interested in
Changes between a liquid and gas exsample​
exis [7]

Here are some examples:-

Water → water vapour

bromine →  bromine gas

6 0
2 years ago
How many liters of fluorine gas, at standard temperature and pressure, will react with 23.5 grams of potassium metal? Show all o
Sladkaya [172]

Potassium 23.5g/39.0983g/mol = 0.601mol

The Ratio of reactants is 2 to 1 so (0.601mol)/2 = 0.3005mol

Therefore 0.3005mol of F2 is needed to find liters use

formula V = nRT/P (V)Volume = 22.41L

(T)Temperature = 273K or 0.0 Celsius

(P)Pressure = 1.0atm

<span>(R)value is always .08206 with atm n = 0.3005moles (273)(.08206)(0.3005)/1 = V V = 6.7319 Liters</span>

8 0
3 years ago
Read 2 more answers
2CO + O2 --&gt; 2002
olga_2 [115]
8 moles I think I’m not sure
4 0
3 years ago
James exclaims to his chemistry teacher that a new element has been discovered that fits between Nickel and Copper on the period
myrzilka [38]

Aye you have the same class as me bruh I need help on some chemistry qustions

8 0
3 years ago
Read 2 more answers
Which of these measurements is expressed as three significant figures?
kipiarov [429]

Which of these measurements is expressed as three significant figures?  


C. 4.20 g


6 0
3 years ago
Other questions:
  • Haw does an atom change if all of it’s electrons removed
    6·1 answer
  • Balance the equation Mg+Fe2O3-&gt;MgO+Fr
    12·2 answers
  • The gas left in a used aerosol can is at a pressure of 103 kPa at 25.0 °C. If the can heats up to 50.0 °C, what is the pressure
    15·1 answer
  • Calculate the volume in milliliters of a 5.55-g sample of a solid with a density of 3.03 g/mL
    13·1 answer
  • If 0.66 g magnesium reacts exactly with 0.43 g oxygen, what mass of magnesium oxide will be produced?
    6·1 answer
  • Which statement correctly describes the ionization of acids?
    15·1 answer
  • What is the relationship between Celsius and kelvin
    12·1 answer
  • What is the mass (in grams )for 88.624moles of silver (Ag )? ( round your answer to a whole number (no decimal )
    6·1 answer
  • PLZ HELP ME WITH MY WORK
    14·1 answer
  • Someone plz help me !!<br><br> Science <br> Or<br> Bias?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!