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abruzzese [7]
3 years ago
11

Suppose 870.mmol of electrons must be transported from one side of an electrochemical cell to another in 84. seconds. Calculate

the size of electric current that must flow.
Chemistry
1 answer:
-BARSIC- [3]3 years ago
7 0

Answer:

The size of an electric current that must flow is 999.18 Ampere.

Explanation:

Moles of electrons passed, n = 870. mmol= 0.870 mol

1 mmol = 0.001 mol

Number of electrons =N=n\times N_A

Total charge on N electrons = Q = 1.602\times 10^{-19} C\times N

Duration of time in which N electrons were passed = T = 84. seconds

Amount of current passes = I

I=\frac{Q}{T}

I=\frac{1.602\times 10^{-19} C\times N}{84. s}

=\frac{1.602\times 10^{-19} C\times 0.870\times 6.022\times 10^{23}}{84. s}

I = 999.18 Ampere

The size of an electric current that must flow is 999.18 Ampere.

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How many atoms of San are in 0.796 moles of this element
xenn [34]

Answer:

4.8× 10²³ atoms

Explanation:

Given data:

Number of moles of San element = 0.796 mol

Number of atoms present = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

0.796 mol ×  6.022 × 10²³ atoms / 1mol

4.8× 10²³ atoms

8 0
3 years ago
Using the Bohr model, determine the energy in joules of the photon produced when an electron in a Li2+ ion moves from the orbit
djverab [1.8K]

Answer:

1.64x10⁻¹⁸ J

Explanation:

By the Bohr model, the electrons surround the nucleus of the atom in shells or levels of energy. Each one has it's energy, and the electron doesn't fall to the nucleus because it can reach another level of energy, and then return to its level.

When the electrons go to another level, it absorbs energy, and then, when return, this energy is released, as a photon (generally as luminous energy). The value of the energy can be calculated by:

E = hc/λ

Where h is the Planck constant (6.626x10⁻³⁴ J.s), c is the light speed (3.00x10⁸ m/s), and λ is the wavelength of the photon.

The wavelength can be calculated by:

1/λ = R*(1/nf² - 1/ni²)

Where R is the Rydberg constant (1.097x10⁷ m⁻¹), nf is the final orbit, and ni the initial orbit. So:

1/λ = 1.097x10⁷ *(1/1² - 1/2²)

1/λ = 8.227x10⁶

λ = 1.215x10⁻⁷ m

So, the energy is:

E = (6.626x10⁻³⁴ * 3.00x10⁸)/(1.215x10⁻⁷)

E = 1.64x10⁻¹⁸ J

3 0
3 years ago
Describe the evidence of changes in organisms in the Cambrian Era that are reflected in the fossil record.​
UkoKoshka [18]

Answer:

Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla

Explanation:

also pls vote brainliest <3 :)))

3 0
2 years ago
In the equation KClO3 -&gt; KCl + O2, how many moles of oxygen are produced when 3.0 mol of KClO3 decomposes completely?
IceJOKER [234]

Answer:

4.5

Hope this helps!

6 0
2 years ago
Read 2 more answers
Can somebody please help me!!!!
Anarel [89]

Answer:

Friston to energy

Explanation:

Friction to Energy as its a energy stooping the object form moving

5 0
2 years ago
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