answer.
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
Olegator [25]
2 years ago
15

What mass of ni2+ is produced in solution by passing a current of 67.0 a for a period of 14.0 h , assuming the cell is 90.0 % ef

ficient?
Chemistry
1 answer:
Ira Lisetskai [31]2 years ago
6 0
When we have the current = 67 coulombs/second

and mol of electrons of Ni2+= 2 

faraday's constant = 96500 

molar mass of Ni = 58.69 g/mol 

time (sec) = 14 h * 3600

∴ the mass of Ni2+ = 50400 sec * 67 coulombs/second * 1 mol of electrons / 96500 coulombs * 1 mol of Ni / 2 mol of electrons * 58.69 g/mol / mol of Ni

                               = 1027 g Ni
You might be interested in
Which of the following energy sources obtains its energy from gravitational potential energy?
ipn [44]
It is a geothermal power plant
6 0
1 year ago
A silver sphere has a mass of 5.492 g and a diameter of 10.0 mm. What is the density of silver metal in grams per cubic centimet
Blizzard [7]

Answer:

Explanat\rho=10.5\frac{g}{cm^3}ion:

Hello,

In this case, considering the given diameter which is related to a radius of 5.0 mm and the formula for the calculation of the volume of the sphere, its volume in cubic centimeters (5.00 mm = 0.5 cm) is then:

V=\frac{4}{3} \pi r^3=\frac{4}{3}*\pi*(0.5cm)^3\\\\V=0.524cm^3

In such a way, the density turns out:

\rho =\frac{m}{V} =\frac{5.492g}{0.048m^3} \\\\\rho=10.5\frac{g}{cm^3}

Best regards.

8 0
1 year ago
How did Mendeleev feel about Russian science education when he came back from Germany
krok68 [10]

As he began to teach inorganic chemistry, Mendeleev could not find a textbook that met his needs. Since he had already published a textbook on organic chemistry in 1861 that had been awarded the prestigious Demidov Prize, he set out to write another one. The result was Osnovy khimii (1868–71; The Principles of Chemistry), which became a classic, running through many editions and many translations. When Mendeleev began to compose the chapter on the halogen elements (chlorine and its analogs) at the end of the first volume, he compared the properties of this group of elements to those of the group of alkali metals such as sodium. Within these two groups of dissimilar elements, he discovered similarities in the progression of atomic weights, and he wondered if other groups of elements exhibited similar properties. After studying the alkaline earths, Mendeleev established that the order of atomic weights could be used not only to arrange the elements within each group but also to arrange the groups themselves. Thus, in his effort to make sense of the extensive knowledge that already existed of the chemical and physical properties of the chemical elements and their compounds, Mendeleev discovered the periodic law.

5 0
2 years ago
Read 2 more answers
William adds two values, following the rules for using significant figures in computations. He should write the sum of these two
Lunna [17]
<span>when it comes to adding or subtracting numbers, his final answer should have the same number of decimal places as the least precise value.
For example if you add 2 numbers; 10.443 + 3.5 , 10.443 has 3 decimal places and 3.5 has only one decimal place.
Therefore 3.5 is the less precise value.
So when adding these 2 values the final answer should have only one decimal place.
after adding we get 13.943 but it can have upto one decimal place. then the second decimal place is less than 5 so the answer should be rounded off to 13.9.
the answer is the same number of decimal places as the least precise value</span>
6 0
1 year ago
Read 2 more answers
Consider the following information. The lattice energy of CsCl is Δ H lattice = − 657 kJ/mol. The enthalpy of sublimation of Cs
AlladinOne [14]

Answer:

<ERROR>-----------------------------------------------------------------------------<ERROR>

Explanation:

8 0
2 years ago
Read 2 more answers
Other questions:
  • The solid compound, K2SO4, contains?
    5·1 answer
  • If 455-ml of 6.0 M HNO3 is used to make 2.5 L dilution, what is the molarity of the dilution
    6·1 answer
  • A hydrogen atom is removed from the first carbon atom of a butane molecule and is replaced by a hydroxyl group. draw the new mol
    5·1 answer
  • The equilibrium constant k for the synthesis of ammonia is 6.8x105 at 298 k. what will k be for the reaction at 375 k?
    5·2 answers
  • Water is sometimes removed from the products of a reaction by placing the products in a closed container with excess P4O10. Wate
    9·2 answers
  • Butter has a specific gravity of 0.86. What is the mass of 2.15 L of butter?
    12·1 answer
  • If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the struct
    13·1 answer
  • Draw the structure of the amine and carboxylic acid reactants required to form the following amide in an amidation reaction.Draw
    5·1 answer
  • In each pair of statements, choose the example that is more reliable.
    15·2 answers
  • A solution was made in a 200.00 mL volumetric flask consisting of 18.00 mL of 2.125 M HCl and 0.4104 grams of CaCO3, followed by
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!