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2 years ago

Consider the entropy change in the following chemical or physical processes:

Chemistry

1 answer:

Likurg_2 [28]2 years ago

3 0

Answer:

Explanation:

Recall that entropy measures the number of microstates in a substance, which is highest in gases, followed by liquids and solids. Hence, entropy increases if the products have more gaseous molecules than the reactants.

In reaction one, chlorine gas is converted into solid NaCl, so entropy decreaes.

In reaction two, four moles of gas are converted into two moles of gas, so entropy decreases.

In reaction three, ice is melted to form water, which has higher entropy. Thus, entropy increases.

In reaction four, a liquid is freezed into its solid phase, leading to a decrease in entropy.

In reaction five, oxygen gas is converted into solid MgO, so entropy decreases.

In conclusion, the answer is D.

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Marizza181 [45]

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4 years ago

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Calculate the fraction of atoms in a sample of argon gas at 400 K that have an energy of 12.5 kJ or greater. Report your answer

emmainna [20.7K]

Answer:

0.023

Explanation:

The Arrhenius' equation states that:

$k = A*e^{\frac{-Ea}{RT}$

Where k is the velocity constant of the reaction, A is the constant of the collisions, Ea is the activation energy (the energy necessary to the molecules have so the reaction will happen), R is the gas constant (8.314 J/molK) and T is the temperature.

This equation is derivated of:

k = pZf

Where

p=fraction of collisions that occur with reactant molecules properly oriented

f=fraction of collisions having energy greater than the activation energy

Z=frequency of collisions

Thus, p*Z = A, and

f = $e^{\frac{-Ea}{RT} }$

So, if the energy of the molecules is 12.5 kJ/mol = 12500 J/mol, thus the fraction will be:

f = $e^{\frac{-12500}{8.314*400} }$

f = 0.023

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3 years ago

I am still confused as to how you get 332 degrees.

Morgarella [4.7K]

I'm confused mind showing the problem

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4 years ago

Which of the mechanical waves below has the greatest energy?

Volgvan

Answer:

Blue wave.

Explanation:

The energy of a wave depends on its amplitude. A wave having more amplitude will have greatest energy while a wave having small amplitude will have least energy.
The given figure shows four waves that are shown with green, orange, blue and red color.
It is very clear from the figure that the amplitude of blue wave is greatest of all the wave.
Hence, blue wave will have greatest energy.

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4 years ago

A mountaineer shouts for help Half a second later (0.5 she hears the echo How far away is the rock face which is reflecting her

Tema [17]

Answer:

82.5 metres

Explanation:

speed=330m|s

initial time taken =0.5÷2=0.25

distance=speed×time

330m|s × 0.25s = 82.5m

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3 years ago