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USPshnik [31]
3 years ago
6

Point give away number 5!

Chemistry
2 answers:
777dan777 [17]3 years ago
6 0

Answer:

o.o

Explanation:

Leya [2.2K]3 years ago
5 0

thanksssssss

I like your pfp!!!!

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Calculate the change in the entropy of the system and also the change in the entropy of the surroundings, and the resulting tota
Ghella [55]

Answer:

(a) ΔS_{sys}  = 2.881 J/K; ΔS_{sur}  = -2.881 J/K; total change in entropy = 0

(b)ΔS_{sys}  = 2.881 J/K; ΔS_{sur}  = 0 ; total change in entropy = 2.881 J/K

(c) ΔS_{sys}  = 0 ; ΔS_{sur}  = 0 ; total change in entropy = 0

Explanation:

In the given problem, we need to calculate the change in the entropy of the system and also the change in the entropy of the surroundings, and the resulting total change in entropy, when a sample of nitrogen gas of mass 14 g at 298 K and 1.00 bar doubles its volume. We have the following variable:

mass (m) = 14 g

Temperature = 298 K

Pressure = 1.00 bar

Initial volume = V_{1}

Final volume = V_{2} = 2V_{1}

(a) Change in entropy of the system ΔS_{sys} = nRIn\frac{V_{2} }{V_{1} }

where R = 8.314 J/(mol*K)

n = number of moles = mass/molar mass = 14/ 28 = 0.5 moles

ΔS_{sys} = 0.5*8.314*ln2 = 2.881 J/K

Change in entropy of the surrounding ΔS_{sur} = -2.881 J/K

Therefore, for a reversible process, the total change in entropy = ΔS_{sys}+ΔS_{sur} = 2.881 - 2.881 = 0

(b) Because entropy is a state function, we use the same procedure as in part (a). Thus, ΔS_{sys}  = 2.881 J/K

Since surrounding does not change in this process ΔS_{sur} = 0.

total change in entropy = ΔS_{sys}+ΔS_{sur} = 2.881 - 0 = 2.88 J/K

(c) For an adiabatic reversible expansion, q(rev) = 0, thus:

ΔS_{sys}  = 0

Since heat energy is not transferred from the system to the surrounding

ΔS_{sur}  = 0

total change in entropy = ΔS_{sys}+ΔS_{sur} = 0

6 0
3 years ago
What is national flower of nepal?
Vanyuwa [196]

Answer:

national flower : Rhododendron

national animal : cow

national bird : Himalayan Monal

4 0
3 years ago
In chemistry class, a student conducted an investigation on the factors that affect the solubility of copper (II) sulfate (CUSO)
beks73 [17]

Answer:

See Explanation

Explanation:

The rate of a chemical reaction depends on certain factors. Some of these factors include; surface area, temperature, nature of reactants etc.

The trial that exhibits the slowest rate of dissolution of CuSO4 crystals is trial 2 because the crystals have a small surface area since the crystals were large. Also, the solution was not agitated or stirred to increase the rate of collision between the water and the CuSO4 crystals.

Increase in temperature, agitation of the reaction solution and high surface area increases the rate of collision between the water and CuSO4 crystals leading to a faster rate of dissolution. This occurs in trial 3.

3 0
3 years ago
A boy of mass 60 kg and a girl of mass 40 kg are together and at rest on a frozen pond. What is the initial momentum of the boy?
Marianna [84]

The initial momentum of the boy is 0 kgm/s the right option is A. 0 kgm/s.

<h3>What is momentum?</h3>

Momentum can be defined as the product of mass and velocity. The S.I unit of momentum is kgm/s.

The initial momentum of the boy can be calculated using the formula below.

Formula:

  • M' = mu

Where:

  • M = Initial momentum of the boy

From the question,

Given:

  • M = mass of the boy = 60 kg
  • U = Initial velocity of the boy = 0 m/s (at rest)

Substitute these values into equation 1

  • M = 60(0)
  • M = 0 kgm/s

Hence, The initial momentum of the boy is 0 kgm/s the right option is A. 0 kgm/s.
Learn more about momentum here: brainly.com/question/7538238

8 0
2 years ago
A 0.005 M potassium hydroxide solution is an example of what type of solution? *
poizon [28]

Answer:

Basic solution

Explanation:

A solution containing 0.005 M potassium hydroxide has a pH of;

pOH= -log[0.005]

pOH= 2.3

But pH+pOH=14

Therefore;

pH= 14-pOH

Hence;

pH= 14-2.3= 11.7

A solution having a pH of 11.3 is clearly a basic solution because this pH indicates a substance that is basic in nature. Hence the answer given.

7 0
3 years ago
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