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lina2011 [118]
2 years ago
5

Answers are either: 10.4g, 5.18g, 37.3g, 26.4g, 20.7g

Chemistry
1 answer:
gizmo_the_mogwai [7]2 years ago
8 0

Answer:

20.7 g NH3

Explanation:

<u>Convert to moles of N2:</u>

(17.0 g N2) / (28.02 g/mol N2) = 0.607 moles N2

<u>Convert to moles of NH3: </u>

(0.607 moles N2)(2 moles NH3 / 1 mole N2) = 1.213 moles NH3

<u>Convert to grams of NH3:</u>

(1.213 moles NH3)(17.03 g/mol NH3) = 20.66 g NH3

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Consider the following equilibrium: 4KO2(s) + 2H2O(g) 4KOH(s) + 3O2(g) Which of the following is a correct equilibrium expressio
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3 years ago
determine the frequency and wavelength (in nm) of the light emitted when the e- fell from n=4 and n=2
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Answer:

Frequency = 6.16 ×10¹⁴ Hz

λ = 4.87×10² nm

Explanation:

In case of hydrogen atom energy associated with nth state is,

En =  -13.6/n²

For n = 2

E₂ = -13.6 / 2²

E₂ = -13.6/4

E₂ = -3.4 ev

Kinetic energy of electron = -E₂ = 3.4 ev

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Kinetic energy of electron = -E₄ = 0.85 ev

Wavelength of radiation emitted:

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hc/λ = E₄ - E₂

by putting values,

6.63×10⁻³⁴Js × 3×10⁸m/s / λ = -0.85ev   - (-3.4ev )

6.63×10⁻³⁴ Js× 3×10⁸m/s / λ = 2.55 ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 4.08×10⁻¹⁹ J

λ = 4.87×10⁻⁷ m

m to nm:

4.87×10⁻⁷ m ×10⁹nm/1 m

4.87×10² nm

Frequency:

Frequency = speed of electron / wavelength

by putting values,

Frequency = 3×10⁸m/s /4.87×10⁻⁷ m

Frequency = 6.16 ×10¹⁴ s⁻¹

s⁻¹ = Hz

Frequency = 6.16 ×10¹⁴ Hz

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