An electron is on a -2.5 eV energy level. the electron is stuck by a 2.5 eV photon. What will most likely happen?

For the reaction of oxygen and nitrogen to form nitric oxide, consider the following thermodynamic data (Due to variations in th

CaHeK987 [17]

Answer:

a. 7278 K

b. 4.542 × 10⁻³¹

Explanation:

a.

Let´s consider the following reaction.

N₂(g) + O₂(g) ⇄ 2 NO(g)

The reaction is spontaneous when:

ΔG° < 0 [1]

Let's consider a second relation:

ΔG° = ΔH° - T × ΔS° [2]

Combining [1] and [2],

ΔH° - T × ΔS° < 0

ΔH° < T × ΔS°

T > ΔH°/ΔS°

T > (180.5 × 10³ J/mol)/(24.80 J/mol.K)

T > 7278 K

b.

First, we will calculate ΔG° at 25°C + 273.15 = 298 K

ΔG° = ΔH° - T × ΔS°

ΔG° = 180.5 kJ/mol - 298 K × 24.80 × 10⁻³ kJ/mol.K

ΔG° = 173.1 kJ/mol

We can calculate the equilibrium constant using the following expression.

ΔG° = - R × T × lnK

lnK = - ΔG° / R × T

lnK = - 173.1 × 10³ J/mol / (8.314 J/mol.K) × 298 K

K = 4.542 × 10⁻³¹

7 0

3 years ago

Scientific knowledge can withstand the test of time because A. exceptions can be made regarding scientific laws. B. it is open t

Iteru [2.4K]

B. It is open to change as new evidence or data is discovered. If scientists discover new evidence, they must modify their theories to conform with the new data.

A. is incorrect. Scientific laws are so well established that there can be no exceptions.

C. is incorrect. A scientific theory is the collective judgement of scientists as to the best explanation for a phenomenon. A new observation may require modification of the theory.

D. is incorrect. Advancements in technology can provide new evidence that requires new explanations.

5 0

3 years ago

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What net force is required to push a sofa with a mass of 59 kilograms so that it accelerates at 9.75 meters/second^2

Tresset [83]

Force = Mass * Acceleration = 59 kg * 9.75 m/s^2 = 575.25 N

6 0

3 years ago

Read 2 more answers

State two differences between metals and non metals with respect to their

Naya [18.7K]

Answer:

Physical Properties

1. Metals are shiny but most non - metals lack this property.

2. Metals are able to deform under compression (malleable) but most non - metals lack this property.

Chemical Properties

1. Metals are good conductorsof heat and electricity but most non - metals are insulators.

2. Metals, when exposed to water atmospheric oxygen tend to rust but non - metals lack this chemical property

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3 years ago

what kind of generalization can you make about how the number of protons and neutrons are related to each other in the elements

AURORKA [14]

... to be called elements. This lesson shows you how to predict the numbers of neutrons, electrons, andprotons of the isotopes they are likely to find in nature. (cont.) ... What kind of generalization can you make about how the number of protons and neutrons are related to each other in the elements? Unit 1 • Investigation IV

4 0

3 years ago