2C(s) + 2H2(g) → C2H4(g): ΔH = +52.4 kJ/mol

Which statement about this reaction is correct?

Answers

Answer 1
Answer;

26.2 kJ of energy are absorbed for every mole of carbon reacted

Explanation;ΔH is the enthalpy change which is given by subtracting the energy of reactants from the energy of products.That is; ΔH = energy of products - energy of reactantsIn this case, it means that C2H4 has more energy than the the reactants. 52.4 J of energy to be precise, this energy is absorbed during the reaction.However, Two moles of Carbon  require that much energy, thus one mole will require only 26.2 to react.
Answer 2

Answer: D) 26.2 kJ of energy are absorbed for every mole of carbon reacted.


Related Questions

49 POINTS!!! PLEASE HELP ME HURRY!!!

Find the volume of each figure to the nearest tenth.

Answers

V = L x W x H

V = 11 x 5 x 6

V = 330

the volume is V = 330 cm

V=L*W*H

what is the bronsted acid of NO2- + H2O HNO2 + OH-​

Answers

Answer;

H2O -Bronsted Acid

Explanation;Bronsted-Lowry acids are  H+ donors , while Bronsted-Lowry bases are H+ acceptors .A reaction of a Bronsted-Lowry acid and a Bronsted base is a neutralization reaction that is characterized by H+ transfer.The above reaction is an example of base ionization or dissociation where;

                 B (aq) + H2O (l) → BH+ (aq) + OH– (aq)

          That is; Base + Acid will give a conjugate acid + hydroxide ion

In our case; NO2- + H2O → HNO2 + OH-​ ; H2O is the H+ donor and thus, it is a Bronsted Acid.

Final answer:

In the gender reaction water acts as the Bronsted acid because it donates a proton to the nitrite ion which in turn acts as the Bronsted base.

Explanation:

In the given equation NO2- + H2O -> HNO2 + OH-, the Bronsted acid is H2O. According to the Bronsted-Lowry definition an acid is a substance that can donate a proton (H+), and a base is a substance that can accept a proton. In this reaction water (H2O) donates a proton to the nitrite ion (NO2-) and hence it is the Bronsted acid. The nitrite ion is the Bronsted base because it accepts a proton from water to form nitrous acid (HNO2).

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a sound waves frequency is 4 hz and its wavelength is 8 meters. what is the waves speed

Answers

Answer:

32 m/s

Explanation:

Frequency is the number of waves that pass a particular point in 1 second

Wavelength is the distance between 2 crests or 2 troughs

Speed = frequency x wavelength

Substituting the values

Speed = 4 Hz x 8 m

Speed = 32 m/s

Waves speed is 32 m/s

The speed of the sound wave is 32 meters per second.

To find the speed of the wave, we can use the relationship between speed, frequency, and wavelength, which is given by the equation:

[tex]\[ \text{Speed} = \text{Frequency} \times \text{Wavelength} \][/tex]

Given that the frequency of the sound wave is 4 Hz (hertz) and the wavelength is 8 meters, we can plug these values into the equation:

[tex]\[ \text{Speed} = 4 \, \text{Hz} \times 8 \, \text{m} \] \[ \text{Speed} = 32 \, \text{m/s} \][/tex]

Therefore, the speed of the sound wave is 32 meters per second. This is a fundamental relationship in wave mechanics, where the speed of a wave is the product of its frequency and its wavelength.

Convert 23.92inHg to torr.

Answers

Answer;

= 607.568 Torr

Explanation;

1 in of mercury is equivalent to 25.4 Torr  

Therefore;

23.92 InHg will be equal to;

23.92 × 25.4  

= 607.568 Torr

All the elements of a family in the periodic table have what feature in common?

Answers

They all have the same number of electrons in the electron cloud.

Answer:

The have same number of valence electrons

Explanation:

The elements in the same group has similar number of valence electrons. For instance All the alkali metals in Group 1 have 1 valence electron, so they all tend to react the same way with other substances. The elements in each group have the same number of electrons in the outer orbital which are responsible for the chemical properties of element so we can say that each family has the same chemical properties.

What is the porcent of H in NH3

Answers

Answer:

17.65 %.

Explanation:

To calculate the % of H in NH₃:

% H = [Atomic mass of (3H)/molar mass of NH₃] x 100 = [(3 x 1.0)/(17)] x 100 = 17.65 %.

How are meteorites and meteors different?

Meteorites are found in space and meteors are not.
Meteorites usually burn up in the atmosphere, but meteors do not.
Meteorites are larger than meteors.
Meteorites have struck the Earth's surface, but meteors have not.

Answers

Meteors are a streak of light. A meteorite is when it hits Earth's surface. So, it would be D.

Final answer:

Meteorites have struck the Earth's surface, but meteors have not. Meteorites are meteoroids that land on Earth, whereas meteors are glowing gases in the atmosphere that do not reach the surface.

Explanation:

Meteorites are meteoroids that survive the journey through the atmosphere and hit the Earth's surface. On the other hand, meteors are the glowing trail of gases formed as meteoroids heat up in the atmosphere but do not reach the Earth's surface.

Meteorites can be found on Earth, providing valuable information about our solar system, while most meteors burn up before reaching the surface. The distinction between meteorites and meteors lies in their fate upon entering the Earth's atmosphere.

Which of the following is true for the equilibrium constant of a reaction? Its value remains constant at different temperatures. It is a ratio of coefficients of reactants to products. It is represented by the symbol K. Its value is always less than 1.

Answers

Answer:

Option C :-It is represented by K.

Explanation:

Equilibrium constant is the ratio of products to reactants.

It has a constant value at specific temperature. If temperature changes, K also changes.

It has a value in the range of 0.001 to 1000.

Answer: Option (c) is the correct answer.

Explanation:

Equilibrium reaction means when rate of forward reaction is equal to rate of backward reaction.

And, relationship between the amount of products and the amount of reactants present in an equilibrium reaction at a given temperature is known as equilibrium constant.

Equilibrium constant is denoted by 'K'.

For example, [tex]xA + yB \rightarrow zC[/tex]

The equilibrium constant for this reaction will be as follows.

           K = [tex]\frac{[C]^{z}}{[A]^{x}[B]^{y}}[/tex]

Therefore, it is the ratio of products to reactants. And, if value of K > 1 then it means that the mixture contains mostly products whereas K < 1 means that the mixture contains mostly reactants.

Hence, we can conclude that out of the given options it is represented by the symbol K, is true for the equilibrium constant of a reaction.

what is the percentage yield of carbon disulfide if the reaction of 32.0g of sulfur dioxide produces 12.0g of carbon disulfide?

Answers

Answer;

= 63.04 %  

Explanation;

The balanced equation for the reaction;

5 C + 2 SO2 → CS2 + 4 CO  

We can calculate the theoretical yield;

   = (32.0 g SO2) / (64 g C/mol) x (1/2) x (76.1418 g CS2/mol)

   = 19.035 g CS2 in theory  

But;

Percentage yield = Actual yield/theoretical yield × 100%

                              = (12.0 g) / ( 19.035 g) × 100%

                              = 0.6304 × 100%

                               = 63.04%  

Final answer:

To calculate the percentage yield of carbon disulfide, we can compare the actual yield to the theoretical yield. Using stoichiometry, we can calculate the theoretical yield based on the given masses of sulfur dioxide and carbon disulfide. The percentage yield is found to be 31.5%.

Explanation:

To calculate the percentage yield of carbon disulfide in this reaction, we need to compare the actual yield (12.0g) to the theoretical yield. The theoretical yield can be calculated using stoichiometry by converting the mass of sulfur dioxide (32.0g) to moles, and then using the mole ratio between sulfur dioxide and carbon disulfide in the balanced equation.

First, let's find the moles of sulfur dioxide:

32.0g SO2 * (1 mol SO2 / 64.06g SO2) = 0.500 mol SO2

According to the balanced equation, 1 mol of SO2 produces 1 mol of carbon disulfide. So, the theoretical yield of carbon disulfide is also 0.500 mol.

Now, we can convert the theoretical yield from moles to grams:

0.500 mol CS2 * (76.14g CS2 / 1 mol CS2) = 38.07g CS2

Finally, we can calculate the percentage yield:

Percentage yield = (Actual yield / Theoretical yield) * 100

Percentage yield = (12.0g / 38.07g) * 100 = 31.5%

Which functional group is found in an ester

Answers

RCOOR. the answer is first option

Why do you think the process to create a protected area takes so long?

Answers

The process to create a protected area takes a long time because there's numerous things that have to be taken in account and sorted out before the area gets that kind of legal status.

Usually there's people living in the area that is supposed to be protected, though it is mostly small settlements. The people living there are connected with that area, use the resources, and their lives are largely based and dependent on it. In order for any problems to be avoided, these people should all be educated, deals to be made with them, and properly negotiated so that the area wouldn't have any damage, but also them to be able to sustain themselves.

The boundaries of the area are also complicated, it it takes time to sort out what parts should be included and what not. Basically to set the priorities.

People should be employed to protect and take care of the area, so they have to undergo a training, education, and to get familiar with it.

The legalization of the area as such can sometimes too make problems and take some time.

What is a light year?

A.The distance light travels in one earth year

B.The distance light travels from the sun to the earth

C.The distance light travels in one orbit of the moon

D.The time it takes light to travel across the universe

Answers


a. the distance light travels in one earth year

Final answer:

A light year is the distance light is able to travel in one year in space, which is approximately 9.5 trillion kilometers. It is often used by astronomers to measure large distances between celestial objects such as stars and galaxies. Correct answer to the student's question is option A.

Explanation:

A light year is a unit of distance equal to the distance light travels in one year. When light travels in the vacuum of space, it moves at a speed of about 300,000 kilometers per second(km/s), which is the fastest speed anything can travel in the universe.

Therefore, the true answer to the question is A.

The distance light travels in one earth year. This equates to approximately 9.5 trillion kilometers.

Light-years are commonly used by astronomers to measure vast distances in the universe. For example, the nearest star to us, Proxima Centauri, lies about 4.24 light years away from Earth, and the Andromeda Galaxy, our closest large galactic neighbor, is roughly 2.5 million light years distant.

When we observe celestial bodies like stars and galaxies, we see them as they were years, centuries, or even millennia ago because their light has taken that long to reach us.

when iron rusts it no longer conducts electricity this is because ​

Answers

it has gone through the process of a chemical reaction, and is no longer in its original form, which makes it lose its means of conductivity

Final answer:

Iron rusts when exposed to oxygen and water, forming a red-brown hydrated metal oxide called rust. This rust is a poor conductor of electricity compared to iron metal. The rust continually flakes off, exposing fresh metal surface susceptible to further oxidation.

Explanation:

Iron rusts when it is exposed to oxygen and water. The rust that forms on iron is a red-brown hydrated metal oxide known as Fe2O3 xH2O. When iron rusts, it no longer conducts electricity because the rust is a poor conductor compared to the original iron metal. The rust flakes off continuously, exposing a fresh metal surface that is vulnerable to further reaction with oxygen and water.

A book is resting on a table. The book has

A)kinetic energy only.

B)potential energy only.

C)both kinetic and potential energy.

D)neither kinetic or potential energy.

Answers

Hey there!

The correct answer should be B. Potential Energy Only

Potential energy is the energy stored in an object because it isn’t moving/isn’t in motion

Hope this helps you!

God bless ❤️

xXxGolferGirlxXx

Which arrow represents the activation energy of the forward reaction

Answers

Answer;

B) B

Explanation;Activation energy is the least possible amount of energy which is required to start a reaction or the amount of energy available in a chemical system for a reaction to take place.A reaction won’t occur unless atoms or molecules of reactants come together. This happens only if the particles are moving, and movement takes energy. Reactants have to overcome forces that push them apart. The energy is called activation energy.
Final answer:

The activation energy for the forward reaction is represented by the arrow from the reactants to the transition state in a reaction diagram.

Explanation:

In a reaction diagram, the activation energy for the forward reaction is represented by the arrow from the reactants to the transition state. This arrow shows the energy barrier that must be overcome for the reaction to occur. The activation energy is the minimum amount of energy that reactant particles must have in order to successfully collide and form products.

What is the period of a wave if the wavelength is 100 and the speed is 200

Answers

Wavelength and frequency are inversely proportional to each other. ... Even though the wave speed is calculated by multiplying wavelength by frequency, an alteration in wavelength does not affect wave speed. Rather, an alteration in wavelength affects the frequency in an inverse manner.

❤️Hello!❤️ This is simple question and easy to understand.

so first you use a formula to calculate frequency of the wave.

v _ stands for velocity a.k.a speed

f_ stands for frequency which you have to find.

(pronounced lemda)_ stands for wavelength.

Then you gonna place all your values according to you have in the formula as shown then solve for f.

Finally, you use the time formula

where

T_ is period a.k.a time which equal to the reciprocal of frequency or equal to 1/f.

Simply input your values according to the formula and you your answer as 0.5s Hope this helps!  ↪️ Autumn ↩️

65 grams of calcium equal how many moles?

Answers

1.6218377410367840 that would be your answer but dont forget to round it to the closets number

If 100.0 ml of HCI stock solution is used to make 500.0-ml of a 0.675 M HCI dilution, what is the molarity of the stock solution ?

Answers

Answer:

3.375 M.

Explanation:

It is known that the no. of millimoles of HCl before dilution = the no. of millimoles of HCl after dilution.

∵ (MV) before dilution = (MV) after dilution.

∴ M before dilution = (MV) after dilution / V before dilution = (0.675 M)(500.0 mL)/(100.0 mL) = 3.375 M.

Which force always attracts objects to each other?

Answers

Gravity is a force that always attracts or pulls objects toward each other without direct contact or impact. Gravitational attraction depends on the mass of the two objects and the distance they are apart. Objects on Earth are pulled toward the center of Earth.

Elements can be represented by chemical symbols. Which of the following is the correct way to write the chemical symbol for sodium?

Answers

Na

hope this helps :)

A chemist needs 22.0 grams of phenol, C6H5OH, for an experiment. how many molecules of phenol would this be?

Answers

0.234 mol C[tex]C_{6}  H_{5}  OH[/tex]

The number of molecules would be - 1.410*[tex]10^{23}[/tex] molecules in 22 grams of phenols.

The molecular formula of Phenol is C6H5OH

, Therefore, molecular weight:

= 6(Mass of carbon) + 6(Mass of hydrogen) + 1 (Mass of oxygen)

= 6 × 12.0107 + 6 × 1.00784 + 15.999 × 1

= 94.11

=> The number of moles of phenols:

=> No of mol of phenol = weight/Mwt

[tex]\frac{weight}{molecular\ weight}\\\\= \frac{22}{94.11}\\[/tex]

= 0.234 moles

=> The number of molecules of phenol would be in 22 grams:

molecules = [tex]6.022 \times 10^{23} *\ (number\ of\ moles)[/tex]

[tex]6.022 \times 10^{23} \times (0.234)\\= 1.410 \times 10^{23}[/tex]

Thus, the number of molecules would be - 1.410 [tex]\times 10^{23}[/tex] molecules.

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Thermal energy is the _____ and internal energy is the _____

Answers.
Average kinetic energy of the particles in an object.

Total energy of particles in an object.

Total translation kinetic energy of the particles in an object.

Answers

Answer:

Thermal energy is the Total translation kinetic energy of the particles in an object and internal energy is the Total energy of particles in an object

Explanation:

Answer:

Thermal is total translation kinetic energy of the particles in an object and Internal energy is the total energy of particles in an object

Explanation:

Which statement best describes the use of a chemical indicator in a titration ?

Answers

A chemical indicator in a titration experiment must change the color of the solution near the equivalence point.

Emma sings into a microphone. The sound is transferred from the microphone to a loudspeaker that is plugged into the wall. Her voice comes out of the loudspeaker and sounds much louder than before.

In this system, sound energy is being transformed into _______ energy and then back into _______ energy.

Answers

Electrical energy and back to sound energy

Electrical then back into sound

An elements atomic number is 117 how many electrons would an atom of this element have?

Answers

117 because the number of protons and neutrons are the same as the atomic mass.

Final answer:

A neutral atom with an atomic number of 117 would have 117 electrons. The valence shell of element 117 (Tennessine) is likely to have 7 electrons, similar to other halogens, though high atomic number elements can be unpredictable due to their instability.

Explanation:

If an element has an atomic number of 117, it means that a neutral atom of this element would have 117 protons in its nucleus. According to the basic rules of atomic structure, a neutral atom has the same number of protons and electrons. Therefore, an atom of this element would have 117 electrons.

Regarding the valence shell electron configuration, since element 117 (Tennessine, Ts) is in the 17th group of the periodic table and is part of the halogens, its valence shell could be similar to that of other halogens. Considering the periodic trends and the fact that it belongs to the 7th period of the table, its valence shell would likely have 7 electrons. However, due to its high atomic number and unstable nature, the element's chemistry might not entirely follow the trends observed in lighter elements.

The same species of organisms with different physical traits are called

Answers

The correct answer is - subspecies.

The subspecies represents an aggregate of phenotypically similar populations of a species. They inhabit a geographic subdivision of the species. They also are differing taxonomically from the other members of the species.

The subspecies are part of a species. They are able to mate with the other members of the species without any problems if they come to a situation like that, and produce healthy offspring. In general, the subspecies is pretty much the same as the species, just that it exhibits some specific physical traits that are not found in the rest of the members of the species.

A perfect example for this is the leopard. The African leopard has short and less dense fur, is larger, lighter in coloration, while the Amur leopard has much denser and longer fur, is slightly smaller, and is darker in coloration. Both of them are part of the same species, but exhibit specific physical traits that make them a subspecies.

Consider the situation. Scientists have developed an explanation of a phenomenon from several verified hypotheses. The explanation has been confirmed through numerous experimental tests.

Which option best describes this explanation?

A. research question
B. scientific theory
C. scientific law
D.hypothesis

I think its B or D.

Answers

scientific theory

hope this helps :)

Answer:

B. scientific theory

Explanation:

The scientific theory explains the phenomenon observed in the natural world. It is based upon the scientific method. To arrive at the scientific theory a hypothesis is formed, experiments are designed and conducted, resulted evaluated, analyzed and conclusions are reached. scientific theory are based upon experiments that are tested under controlled conditions.

NEED HELP ASAP

Which statements describe competition for shelter? Check all that apply.
A. Bees work together to construct a beehive.
B. Two prairie dogs fight over underground space.
C. Several monkeys work to create a space for their young.
D. A pack of lions roar to protect their territory from other lions.
E. Penguins push each other to find room on a floating iceberg.

Answers

Answers are B, D and E. A and C are cooperation for shelter.

Explanation:

Competition means when more than one person or individual is competing for a certain thing.

For example, two prairie dogs fight over underground space.

This means that both the dogs are fighting to have a house for themselves.

Thus, we can conclude that statements which describe competition for shelter are as follows.

Two prairie dogs fight over underground space.A pack of lions roar to protect their territory from other lions.Penguins push each other to find room on a floating iceberg.

Which of the following statements about air masses is true?
A.
Air masses are areas of condensed water vapor, which are also known as clouds.
B.
Air masses are responsible for creating holes in the ozone layer.
C.
Air masses maintain the same moisture and temperature as they move over new areas.
D.
Air masses are created by patterns of heating and cooling of the Earth's surface.

Answers

Answer:

The correct answer is: D. Air masses are created by patterns of heating and cooling of the Earth's surface.

Explanation:

The air masses can be simply be divided into warm and cold ones, further they can be moist or not. The formation of the air masses, be it warm and cold, over the land masses is because of patterns of heating and cooling. This results some areas to produce very large air masses that are cold and dry, like Siberia, or warm and dry large air masses, like Sahara. Also, on a local level there's air masses that develop every day and night, which is noticeable during the night and the morning, where the colder air masses from the mountains move down to the valleys, and the warm air masses from the valleys move up to the mountains. That is a because of the change in the heating and cooling patters that differ during the day and the night.

Answer:

The correct answer is: D. Air masses are created by patterns of heating and cooling of the Earth's surface.

Explanation:

Which type of fire is sometimes set as a way to protect a forest?

Answers

Answer;

Surface fire

Explanation;Surface fires are type of forest fires that may burn primarily as a surface fire, spreading along the ground as the surface litter and undergrowth on the forest floor and is engulfed by the spreading flames.They are the easiest fires to put out and cause the least damage to the forest. Surface fires create the least amount of destruction.These fires protects the forest by releasing the nutrients that would otherwise decompose slowly, having little benefit to the ecosystem.Additionally, these fires allow more open spaces for new and different kinds of vegetation to grow and receive sunlight.
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