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Ipatiy [6.2K]
3 years ago
13

A photon with a wavelength of less than 50.4 nm can ionize a helium atom.

Chemistry
1 answer:
attashe74 [19]3 years ago
7 0

Answer:

  • <em><u>4.38 × 10⁻³⁵ J</u></em>

Explanation:

The <em>ionization potential</em> is the energy required to separate an electron from an atom in gas state and, so, form an ion.

Since it is said that<em> a photon with wavelength of less than 50.4 nm can ionize a Helium atom</em>, the energy of such photon is the ionization potential (energy) of Helium.

The energy of a photon in terms of its wavelength is given by Planck - Einstein's equation:

  • E = h . f = h / (λ . c)

Where,

  • E is the energy of the photon,
  • λ is the wavelength,
  • f is the frequency,
  • h is the Planck's constant = 6.626 × 10⁻³⁴ J.s⁻¹
  • c is the speed of light ≈ 3.0 × 10 ⁸ m/s

Here you know the wavelength, λ = 50.4 nm. You must convert it to meter: 50.4 nm × 10 ⁻⁹ m.

Now you can substitute and compute:

  • E = h / (λ . c) = 6.626 × 10⁻³⁴ J.s⁻¹ / (50.4 × 10⁻⁹ m × 3.0 × 10 ⁸ m/s)

  • E = 0.0438 × 10⁻³³ J = 4.38 × 10⁻³⁵ J ← answer

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If a gas has a molecular mass of 44.0, the volume of 88.0 grams of the gas at STP would be ..
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2) 11.2
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A gas has a volume of 5.00 L at 0°C. What final temperature, in degrees Celsius, is needed to change the volume of the gas to ea
Diano4ka-milaya [45]

Answer:

A = -213.09°C

B = 15014.85 °C

C = -268.37°C

Explanation:

Given data:

Initial volume of gas = 5.00 L

Initial temperature = 0°C  (273 K)

Final volume = 1100 mL, 280 L, 87.5 mL

Final temperature = ?

Solution:

Formula:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Conversion of mL into L.

Final volume = 1100 mL/1000 = 1.1 L

Final volume =  87.5 mL/1000 = 0.0875 L

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₂ = V₂T₁ / V₁

T₂ = 1.1 L × 273 K / 5.00 L

T₂ = 300.3 L.K / 5.00 K

T₂ = 60.06 K

60.06 K - 273 = -213.09°C

2)

V₁/T₁ = V₂/T₂

T₂ = V₂T₁ / V₁

T₂ = 280 L × 273 K / 5.00 L

T₂ = 76440 L.K / 5.00 K

T₂ = 15288 K

15288 K - 273 = 15014.85 °C

3)

V₁/T₁ = V₂/T₂

T₂ = V₂T₁ / V₁

T₂ = 0.0875 L × 273 K / 5.00 L

T₂ = 23.8875 L.K / 5.00 K

T₂ = 4.78 K

4.78 K - 273 = -268.37°C

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2 years ago
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The colored light emitted is energy and in order to emit energy the element should first obtain energy. The energy absorbed by the substance can be in the form of radiation, heat or electricity. Hope this answers the question. Have a nice day.
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