1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
morpeh [17]
3 years ago
7

Air is compressed in a piston–cylinder device from 90 kPa and 20°C to 650 kPa in a reversible isothermal process. Determine the

entropy change of air. The gas constant of air is R = 0.287 kJ/kg·K. (You must provide an answer before moving on to the next part.)
Chemistry
1 answer:
Sophie [7]3 years ago
4 0

Answer:

-0.5674 \frac{kJ}{kgK}

Explanation:

The entropy change of an ideal gas can be calculated by:

s_{2}-s_{1}=Cpln(\frac{T_{2}}{T_{1}})-Rln(\frac{P_{2}}{P_{1}})

You can review its deduction on van Wylen 6 Edition, section 8.10.

This is an isothermal process, so the entropy change will be calculated as:

s_{2}-s_{1}=-Rln(\frac{P_{2}}{P_{1}})

s_{2}-s_{1}=-0.287*ln(\frac{650}{90})=-0.5674[tex]\frac{kJ}{kgK}[/tex]

You might be interested in
Using the Bohr model, determine the energy in joules of the photon produced when an electron in a Li2+ ion moves from the orbit
djverab [1.8K]

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

3 0
3 years ago
SOMEONE ANSWER?!!?!?!,!,EMERGENCY Can someone tell me the answer plz plz I’ll give you brainlist and points plz This is my final
Vera_Pavlovna [14]

Answer: Should be A)

Explanation:

the size of planets effects the amount of gravitational force each planet has, like jupiter, it has the most gravity.

6 0
3 years ago
Please answer the question and explain
Sindrei [870]

Answer:

x=30

Explanation:

I will try to explain with a drawing.

This is a rule of three.

If you are wondering what the rule of three is. It's when u have 3 informations and you solve.

4 0
3 years ago
24 grams of magnesium metal reacts with 16 grams of oxygen gas to form magnesium oxide according to the law of conservation of m
galina1969 [7]
X,,s,smells,s,wow,masks,as,mw
8 0
3 years ago
Formal charge of Cl in CHCl3
Vsevolod [243]
FC(C) = 4 - 0.5*8 - 0 = 0) FC(Cl) = 7 - 0.5*2 - 6 = 0
6 0
3 years ago
Other questions:
  • During surgery, a patient receives 3.5 pt of plasma. How many milliliters of plasma were given?
    7·1 answer
  • Which characteristics both generally decrease when the elements in Period 3 on the Periodic Table are considered in order from l
    12·1 answer
  • What type of bonds hold metal atoms together
    12·1 answer
  • Mass is an intensive physical property because it is dependent on the size of the sample.
    5·2 answers
  • If a liquid has a density of 0.785, then any object with _____ density will float.
    11·1 answer
  • What is the mass number of an atom with 5 proton and 7 neutrons
    8·2 answers
  • A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at –2.34°C. Calculate the molar mass (in
    7·1 answer
  • How many atoms of lead are in 3.25 moles of lead
    8·1 answer
  • Cierta cantidad de hidrogeno esta encerrada en una camara de platino a volumen constante. Cuando la camara se sumerge en un baño
    11·1 answer
  • can someone please answer this please even just the first one, I really need the answer please help me with it, thank you....✨​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!