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user100 [1]
4 years ago
14

In which of these systems is the entropy decreasing?

Chemistry
2 answers:
atroni [7]4 years ago
6 0

I think it is aaaaaaaa I think it's aaa

DochEvi [55]4 years ago
5 0
<h2>Answer:</h2>

The entropy decreases in <u>B. a gas condensing</u>.

<h2>Explanation:</h2>

Entropy refers to phenomenon which measures the spreading of energy in a system. The energy of the system is spreading it has high entropy, whereas if the energy of the system remains concentrated it is said to have decreased entropy.

In case of air escaping from the tire the energy is spreading out that's why the air is moving out of the tire. Thus, it has high entropy. In case of gas condensing which leads to the formation of liquid, the energy of the gaseous particles remains concentrated such that it may lead to the formation of liquid. Thus, this system has decreased entropy.

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2.50 L of a gas at standard temperature and pressure is compressed to 575 mL. What is the new pressure of the gas
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Answer:

4.35 atm

Explanation:

According to the information given;

  • Initial volume of the gas, V₁ is 2.50 L
  • Initial pressure of the gas is standard pressure P₁, normally 1 atm
  • New volume of the gas, V₂ is 575 mL

We are required to determine the new pressure of the gas, P₂ ;

To answer the question, we are going to use the Boyle's law, that relates pressure and volume at constant temperature.

According to Boyle's law;

P₁V₁ = P₂V₂

Therefore, to determine the new pressure, P₂, we rearrange the formula;

New pressure, P₂ = P₁V₁ ÷ V₂

Thus;

P₂ = ( 1 atm × 2.50 L) ÷ 0.575 L

    = 4.3478 atm

     = 4.35 atm

Therefore, the new pressure of the gas is 4.35 atm

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A certain photon has a frequency of 634x1012 Hz. What is the photon's wavelength in a vacuum? Enter your answer in nm (x10-9 m).
Shtirlitz [24]
<h3>Answer:</h3>

4.73 × 10^4 m

<h3>Explanation:</h3>

From the question;

Frequency of the photon = 634 × 10^12 Hz

We are required to calculate the wavelength of the photon.

We need to know the relationship between wavelength and frequency of a wave.

The relationship between f and λ is given by;

c = fλ

Where c, is the speed of light, 2.998 × 10^8 m/s

Therefore, to get the wavelength we rearrange the formula such that;

λ = c ÷ f

  = 2.998 × 10^8 m/s ÷ 634 × 10^12 Hz

  = 4.73 × 10^-5 m

But we require wavelength in nm

1 M = 10^9 nm

Therefore;

Wavelength = 4.73 × 10^-5 m × 10^9 nm/m

                    = 4.73 × 10^4 m

Hence, the photon's wavelength is 4.73 × 10^4 m

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3 years ago
Convert 1.422g/cm^2 to mg/mm^2
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