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
taurus [48]
2 years ago
10

Metal plating is done by passing a current through a metal solution. For example, an item can become gold plated by attaching th

e item to a power source and submerging it into an Au³⁺ solution. The item itself serves as the cathode, at which the Au³⁺ ions are reduced to Au(s). A piece of solid gold is used as the anode and is also connected to the power source, thus completing the circuit. What mass of gold is produced when 15.1 A of current are passed through a gold solution for 31.0 min?
Chemistry
1 answer:
lianna [129]2 years ago
6 0

Answer:

172 g

Explanation:

Let's consider the reduction of Au³⁺ to Au.

Au³⁺(aq) + 3 e⁻ → Au(s)

In order to find the mass of gold produced, we will use the following relations.

  • 1 min = 60 s
  • 1 A = 1 C/s
  • The charge of 1 mole of electrons is 96,468 C (Faraday's constant).
  • 1 mole of Au is deposited when 3 moles of electrons circulate.
  • The molar mass of Au is 196.97 g/mol.

The mass of gold produced when 15.1 A of current are passed through a gold solution for 31.0 min is:

31.0min \times \frac{60s}{1min}  \times \frac{15.1C}{s} \times \frac{1mole^{-} }{96,468C} \times \frac{3molAu}{1mole^{-} } \times \frac{196.97gAu}{1molAu} = 172 gAu

You might be interested in
The properties of two elements are listed below. Element Atomic radius (pm) Ionic radius (pm) First ionization energy (kJ/mol) E
Sedbober [7]

Answer:

K will give up an electron more easily than Br.

Explanation:

Electronegativity of an element is a property that combines the ability of its atom to lose and gain electrons.

The lower the electronegativity value, the more electropositive an element is and the more readily it loses electrons.

From the data given, we see that Br has an E.N value of 3.0 and K has an E.N value of 0.82.

Therefore, Br is highly electronegative and it is able to attract electrons to itself whereas K has a low E.N value. K will give up electrons more readily.

Lookinf at other information in the table, the larger atomic radius and lower ionizaton energy of K are all pointers to how readily it would be able to lose electrons.

We can conclude that K is even a metal.

5 0
3 years ago
A chemical reaction that has the general formula of nA → (A)n is best classified as a reaction.
azamat
Polymerization

For example:
nCH₂=CH₂ ---p,T,kat.----> -[-CH₂-CH₂-]- n
4 0
3 years ago
Read 2 more answers
Balance the equation C4H8 (g) + ?O2(g) → ? CO2 (g) + ? H2O (g), using the smallest possible integers. What is the coefficient of
den301095 [7]
The coefficients should be 1; 6; 4; 4 and the coefficient of CO2 is 4
7 0
2 years ago
Which answer is a scientifically accurate description of velocity?
agasfer [191]

Answer:

B. The motorcyclist traveled southeast along a highway at 55 mph and reached the campsite in less than the two-hour estimated time.

Explanation:

<em>Velocity </em>is the rate at which an object changes position in a specific direction. It has both <em>magnitude and direction.</em>

Travelling <em>southeast</em> at <em>55 mph</em> is a <em>velocity</em>. It gives both speed and direction.

Statements A., B., and C. give the direction but not the speed.

3 0
3 years ago
Read 2 more answers
How does the smell of food being cooked spread so fast ???
sladkih [1.3K]

Answer:

When we cook food in the kitchen, that's the region of higher concentration of the smell. By diffusion, the smell spreads to the whole room and thereby whole house, so anyone standing at a distance, can smell it.

5 0
3 years ago
Read 2 more answers
Other questions:
  • 49 grams of sulfuric acid, H2SO4, is dissolved in 1 liter of solution. Determine the molarity (M).
    14·1 answer
  • The greatest composition by mass in an atom of 17/8 O is due to the total mass of its
    12·1 answer
  • Combustion analysis of toluene, a common organic solvent, gives 6.45 mg of CO2 and 1.51 mg of H2O. If the compound contains only
    8·1 answer
  • Number 7 plz!!!! I have no clue and it’s due by midnight!!!!!!!
    8·1 answer
  • According to your investigation in part A, how do strong acids differ from weak acids? Select all the correct answers. Strong ac
    15·2 answers
  • What element is used in bicycles?
    15·1 answer
  • When a reaction occurs between atoms with ground state electron configurations 1s 2s' and 1s 2s 2p%, the predominant type of bon
    14·1 answer
  • ¿ Quéé patrón de electrones se puede observar con los gases nobles? ¿Los halóge
    13·1 answer
  • What is the hydrogen ion concentration of oven cleaner?
    14·1 answer
  • Plss answer!!! I need help fast
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!