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kumpel [21]
3 years ago
10

Using the Bohr model, determine the energy in joules of the photon produced when an electron in a Li2+ ion moves from the orbit

with n = 2 to the orbit with n = 1.
Chemistry
1 answer:
djverab [1.8K]3 years ago
3 0

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

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g Given that 50.0 mL of 0.100 M magnesium bromide reacts with 13.9 mL of silver nitrate solution according to the unbalanced equ
ipn [44]

Answer:

0.719M AgNO₃

Explanation:

Based on the reaction:

MgBr₂ + 2AgNO₃ ⇄ 2AgBr + Mg(NO₃)₂

<em>1 mole of magnesium bromide reacts completely with 2 moles of AgNO₃</em>

<em />

To find molarity of AgNO₃ solution we need to determine moles of AgNO₃ and, as molarity is the ratio of moles over liter (13.9mL = 0.0139L). Now, to determine moles of AgNO₃ we need to use the reaction, thus:

<em>Moles AgNO₃:</em>

<em />

Moles of MgBr₂ are:

50.0mL = 0.050L * (0.100mol / L) = 0.00500 moles of MgBr₂.

As the silver nitrate reacts completely and 2 moles of AgNO₃ reacts per mole of MgBr₂:

0.00500 moles MgBr₂ * (2 moles AgNO₃ / 1 mole MgBr₂) =

0.0100 moles of AgNO₃ are in the solution.

And molarity is:

0.0100 moles AgNO₃ / 0.0139L =

<h3>0.719M AgNO₃</h3>
3 0
3 years ago
A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane, n the mixture is 330 mm Hg and
Thepotemich [5.8K]
b is the correct answer
4 0
3 years ago
Read 2 more answers
33,792 ft = ? miles. can you help me please
konstantin123 [22]

Answer:

6.4 miles

Could you please give me brainliest, I need it.

Explanation:

7 0
2 years ago
A 25.0 sample of liquid has a mass of 22.1 grams what's the liquids density
lyudmila [28]

The density of the liquid is 0.884 g/mL.

<em>Density = mass/volume</em> =  22.1 g/25.0 mL = 0.884 g/mL

7 0
3 years ago
A) The change in the internal energy of a system that absorbs 2,500 J of heat and that does 7,655 J of work on the surroundings
Phoenix [80]

Answers:

a) 10155 J

b) 16.6 J

Explanation:

According to the First Law of Thermodynamics we have:

\Delta E=Q + W

Where:

\Delta E is the total change in the internal energy of a system

Q is the heat exchanged between the system and its surroundings

W is the work done on the system

a) In this case Q=2500 J and W=7655 J, hence:

\Delta E=2500 J + 7655 J=10155 J

b) In this case Q=12.4 J and W=4.2 J, hence:

\Delta E=12.4 J + 4.2 J=16.6 J

5 0
2 years ago
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