Manganese reacts with hydrochloric acid to produce manganese(II) chloride and hydrogen gas. Mn(s) + 2 HCl(aq) + MnCl, (aq) + H (9) When 0.620 g Mn is combined with enough hydrochloric acid to make 100.0 mL of solution in a coffee-cup calorimeter, all of the Mn reacts, raising the temperature of the solution from 23.5°C to 28.6 °C. Find AHxn for the reaction as written. (Assume that the specific heat capacity of the solution is 4.18 J/g °C and the density is 1.00 g/mL.) -189 kJ 0 -3.44 kJ 0 -1.17 kJ O -2.13 kJ

Answers

Answer 1

The specific heat capacity of the solution is 4.18 j/g°C , the reaction for the ΔH will be - 194 kj /mol Mn .

The quantity of heat absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C) is referred to as the specific heat capacity, and its units are either J/(kg K) or J/(kg °C). The particular intensity of a substance is characterizes as need might have arisen to build the temperature of one gram of the substance by one degree Celsius. This value, which is the same for every substance, can be used to describe a substance's capacity to absorb heat.

                 Mass of Mn = 0.625 g

volume of given solution = 100 ml

initial temperature = 23.5°C

final temperature = 28.8° C

Density = 1 g/mL

heat capacity of the solution = 4.18 J/g° C

Calculate temperature change = ΔT = T₂ - T₁

Substituting the values in given equation :

                        ΔT = 28.8 -23.5

                          = 5.3 °C

Calculate heat of absorbed by solution =

 q solution = m solution  ×Cs×ΔT

                  substituting the the values in the formula :

                  q solution = - 100 × 4.18 × 5.3

                                     = - 2.21 × 10 ³j

calculate the Δ H reaction =

                 ΔH = q solution / mol Mn

 = - 2.22 × 10 ³ / 0.625 × 1 / 54.94

                           = - 194 kj /mol Mn .

How significant is specific heat?

The heat capacity, also known as specific heat, is the quantity of heat needed to raise the temperature by one degree Celsius per unit of mass. Specific heat can be used to distinguish between two polymeric composites and help determine the processing temperatures and amount of heat required for processing.

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Related Questions

1. compare a mixture and a compound , how are they like? ​

Answers

Answer:

Compound are substances which can be formed by chemically combining two or more elements. Mixtures are substances that are formed by physically mixing two or more substances.

I hope it's helpful!

Answer:

COMPOUND= A compound is a substance that is formed when two or more elements combine chemically .

MIXTURES= Mixtures consist of two or more substances simply mixed together , but not chemically combined .

Energy that is stored is called potential energy. Take a round ball that is at rest at the top of the hill. The ball has a lot of potential energy, but no kinetic energy because it is not moving. Once the ball is released and it begins to roll, the potential energy the ball had initially is transformed into kinetic energy. The higher the ball is placed, the ____ potential energy it will have.
A-more B-less

Answers

The question says that when the ball is placed at the top of the hill it has a lot of potential energy. So I think the higher a ball is placed the more potential energy it will have

The equation for the complete combustion of ethane (C2H4) is
C2H4(g) + 302(g) → 2C02(g) + 2H2O(g)
If 2.70 moles C2H4 reacts with 6.30 moles Oz, identify the limiting
reactant.

Answers

-6x -8y = 28
6х + 4y =-28

would this be infinite many solutions or no solutions?

true or false the membrane of rer is continuous with the outer layer of the mithochondrial membrane

Answers

Answer:

false

Explanation:

Fire ants move in to a new environment with the lizards.what will most likely happen to the lizard population over the next several years

Answers

Answer:

Some lizards in the eastern U.S. have adapted to invasive fire ants -- which can bite, sting, and kill lizards -- reversing geographical trends in behavioral and physical traits used to avoid predators. A new study describing this reversal appears online on November 29, 2018, in the journal Global Change Biology and reveals that new environmental challenges can override the historical influences that originally determined geographical trends in traits.

"Rapid environmental change, be it from changing climate or the introduction of invasive species, is putting a lot of pressure on native species," said Christopher Thawley, graduate student at Penn State at the time of the study and first author of the paper. "Usually when researchers look at how native species might respond to these kinds of threats, they might measure one characteristic of the animal and at one or a few sites. In this study, we looked at three separate characteristics of eastern fence lizards from thirteen sites spanning a thousand miles and found that these lizards are capable of adapting in a concerted way to meet the threat of invasive fire ants, and in a relatively short time frame."

Explanation:

The human body has several major systems. Most body systems have multiple functions. Which of the following is NOT a major function of the musculoskeletal system?

A turning food into energy
B helping the lungs take in air
C helping the stomach digest food
D moving the bones of the skeleton

Answers

Answer:D

Explanation:

i got it right LOL

Among the given options, the one which is not a major function of musculoskeletal system is helping the lungs take in air. All others including, energy, digestion, movement of bones etc. are its function.

What are the functions of musculoskeletal system ?

The musculoskeletal system in human body is composed of muscles and bones. The bones in our body are wrapped by the muscles. Muscles helps for the smooth movement of bones.

Muscles convert the chemical energy from food into kinetic energy and use  it for the movement of muscles and bones. Muscles contraction needs intake of energy.

The contraction and relaxation of smooth muscles helps for the easy movement of food through the digestive track. Musculoskeletal system also helps for the movement of other organ system. Hence, option b is not the major function of this organ system.

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Sexual reproduction involves male and female sex cells known as ______.

Answers

Answer:

Sexual reproduction involves male and female sex cells known as - Gametes

Explanation:

In sexual reproduction new organisms are produced from the fusion of a male sex cell with a female sex cell. This fusion of gametes is called fertilisation. Sex cells are also known as gametes. Male gametes are made by male reproductive structures. Female gametes are made by female reproductive structures.

Which situation is does NOT occur during a chemical reaction?
bonds are formed
bonds are broken
mass is conserved
atoms are destroyed

Answers

I’m pretty sure it’s bonds are broken

What evolution was evident in Darwin's finches?
1. beak type
2. leg muscles
3. wing span
4. eyesight

Answers

4. eyesight

explanation:
i’m not 100% bc you didn’t give any info on darwin

Answer:

sorry I don't know the answer hope you understand

1s2, 2s2, 2p6, 3s2, 3p6, 4s2
After this atom gains or loses valence electron/s, what will the oxidation number be?

Answers

Answer:

if it gains then it will be negative to whatever number it has gained and the reverse for when it loses

Explanation:

explain how movements along faults generate earthquakes


Answers

Explanation:

When a plate moves it shifts the earth, and it can cause an earthquake.

A fault is where two of earth's tectonic plates come together. They can slide against the other, causing earthquakes, they can push against each other causing mountains to form, and they can move apart from each other, causing  valleys or trenches.

Explain why the metals conduct electricity.


Write in your own words.
Please don't copy-paste from the internet.

Answers

Answer:

Metals conduct electricity because they have free Electrons in them which helps the current to move eaisily

which is the odd man out? diamond,coal, graphite, bronze.answer with an explanation​

Answers

define p-block element?

Answer:

[tex]\boxed {\boxed {\sf D. \ Bronze}}[/tex]

Explanation:

Let's analyze the answer choices.

The first answer choices. diamond, coal, and graphite, all have something in common. They are allotropes of carbon. They are made of the same element, but each has a different arrangement of atoms, which leads to different properties.

Bronze is an alloy of copper, tin, and other metals. It's not an allotrope of carbon or related to the other answer choices. Therefore, it is the odd one out.


A gas at 127 celsius and 10.0 L expands to 20.0 L. What is the new
temperature in kelvin? (You must convert to Kelvin before calculating
this problem

Answers

Answer:

800.3 Kelvin

Explanation:

127°C = 400.15 Kelvin   (because 127 + 273.15)

Charles Law:

[tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]   Thus, [tex]\frac{10.0 L}{400.15 K} = \frac{20.0 L}{T2}[/tex]

Then, work out the math algebraically.  

T2 = 20.0 / (10.0/400.15)

= 20.0 / 0.02499...

= 800.3 Kelvin

This is assuming the pressure remains constant.

Heavier noble gases are able to form compounds with other elements under specific conditions because their valence ____are farther from the _____

Answers

Answer:

Heavier noble gases are able to form compounds with other elements under specific conditions because their valence electrons are farther from the nucleus.

Explanation:

The name of noble or inert gas is due to the lack of reactivity with other elements. This is due to its electronic configuration, because its outermost shell or valence shell is always complete, without the need to share, give or receive electrons forming bonds. That is, its outer layer is so stable that the element tends not to react with others except in very specific cases.

These exceptions generally involve the heavier noble gases, such as xenon or radon, capable of forming compounds with fluorine and oxygen. This is because the heavier noble gases have more electron shells than the lighter ones. This characteristic causes the outermost electrons to experience a "shielding" effect due to the action of the inner electrons, and they can then be ionized more easily, since the attraction they receive from the positive charges of the nucleus is weaker. That makes the ionization energy low enough to form stable compounds with more electronegative elements, such as fluorine and oxygen.

Heavier noble gases are able to form compounds with other elements under specific conditions because their valence electrons are farther from the nucleus.

Four different people are using sound wave technology. Which describe the form of technology most likely being used by each person?

Answers

Answer:

Its D

Explanation:

Ali is using a specialized headphone that cancels the extra noise in the atmosphere.

Megan is using a transmitter to convert electrical signals into radio waves.

Kristoff is using a microphone to convert sound waves into the electrical signals.

Jenna is using the radio to convert radio waves into sound waves.

Answer:

D. Ali is using specialized headphones, Megan is using a transmitter, Kristoff is using a microphone, and Jenna is using a radio.

Explanation:

How cold does it really get on Pluto's moon, Charon? (I know this is not a Chem question per se, but is there no Earth Science, nor Space, nor Astronomy, nor General Science category on Brainly?)

Answers

Answer:

Explanation:

After various studies and experiments conducted on Pluto's moon, Charon it has been determined that it gets to minus 459.67 degrees Fahrenheit which would be equivalent to minus 273.15 degrees Celsius. This is the coldest temperature that scientists have registered for Charon. This temperature is nearing absolute zero and puts it colder than Pluto itself since Pluto's temperature is believed to get to minus 400 degrees Fahrenheit which is equivalent to minus 240 degrees Celcius.

How many liters are there in 28g of B?

Answers

Hi
The volume is 58.1
The moler mass is 10.8
Molar mass details
10.81B (1*10.81)

Hope this helps

How can you prove that air is a matter ?

Answers

Answer:

One way to prove that air is made of matter is to blow up a balloon. Before you add air into the balloon, it is empty and shapeless. When you puff air into it, the balloon expands, so you know it is filled with something—air is taking up space. You'll also notice that a balloon filled with air sinks to the ground.

Explanation:

The process of photosynthesis converts carbon atoms from carbon dioxide into....

OA. hydrogen
OB.oxygen
OC.sugars
OD.salts

Answers

Answer:

B. Oxygen

Explanation:

Answer:

C.

Explanation:

The process of photosynthesis converts those things into the sugar glucose, which it uses to sustain itself. A biproduct of this process is oxygen, but the carbon is used to make sugar. Hope this helps and brainliest is always appreciated!

can someone help w/ chem plzz

Answers

Answer:

my answer I think is tetrahedral

The pH of a solution is 8. Some hydrochloric acid is added to the solution. Suggest the pH of the solution after mixing. pH=.......??

Answers

Answer:

By adding acid to hydrogencarbonate you create a large concentration of CO2 in solution causing the solution to be highly supersaturated. This keeps the pH down as CO2 is in equilibrium with carbonic acid. During the day long mixing the excess CO2 strips off and as acid leaves the solution the pH increases.

Explanation:

Hope it helps

A solution with a pH of 8 will have its pH reduced with the addition of hydrochloric acid.

What is pH?

It is the degree of acidity or alkalinity of solutions.

pH ranges from 0 to 14 with 7 being a neutral pH. Any pH below 7 is acidic while above 7 is basic.

Thus, a pH of 8 is basic and the addition of hydrochloric acid will reduce it towards 7 or even below it.

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What is the average atomic mass of the isotopes shown in the table?
Isotope Abundance (%) Mass of Isotope (amu)
Isotope-A
54.0
17.984
Isotope-B
32.0
18.985
Isotope-C
14.0
19.982

Answers

Answer:

18.58

Explanation:

From the question given above, the following data were:

Isotope A:

Abundance of A = 54%

Mass of A = 17.984 amu

Isotope B:

Abundance of B = 32%

Mass of B = 18.985 amu

Isotope C:

Abundance of C = 14%

Mass of C = 19.982 amu

Average atomic mass =?

AVERAGE = [(Mass of A × A%)/100)] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]

AVERAGE = [(17.984 × 54%)/100] + [(18.985 × 32%)/100] + [(19.982 × 14%)/100]

= 9.71136 + 6.0752 + 2.79748

= 18.58

Therefore, the average atomic mass of the isotope is 18.58 amu

which of the following indicates the cathode rays has a large charge to mass ratio?

Answers

Answer:

Gggg

Explanation:

The indication of the cathode rays that has a large charge to mass ratio is there were deflected towards a positive electrode. The correct option is b.

What are cathode rays?

Cathode rays are the rays that move through the negatively charged electrode the cathode charge to the positively charged electrode which is the anode charge in a vacuum tube.

These rays travel through a pipe in a straight line with speed when there is voltage is applied. They are also called electron beams. There is a cathode ray tube, CRT, which is a vacuum tube on which cathode rays travel.

So, the correct option will be for the cathode rays would be deflected towards a positive charge anode.

Therefore, the correct option is b, there were deflected towards a positive electrode.

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The question is incomplete. Your most probably complete question is given below:

They were easily deflected

There were deflected towards a positive electrode

They were deflected towards a negative electrode

They caused a fluorescent screen to glow

20.What do carbon and silicon have in common?

a.They belong to the same column (family), therefore they have the same number of valence electrons.
b.They belong to the same column (family), therefore they have the same number of total electrons.
c.They belong to the same column (family), therefore they have the same number of energy levels.
d.They belong to the same column (family), therefore they have the same number of protons.

Answers


a.They belong to the same column (family), therefore they have the same number of valence electrons.

Please help fast. I will give brainliest.

Answers

Answer:39 min

Explanation:

Is hydrogen bond an attraction between polar molecules

Answers

Answer:

No because if there was an attraction hydrogen would not do it's function

Question 4 How many grams of LiOH are needed to make 100 ml of a 0.1 M solution?​

Answers

Explanation:

0.24 grams of LiOH are needed to make 100 ml of a 0.1 M solution

Look carefully at the list of objects and order
them from smallest to largest.
ant
atom
cell
dust particle
ping pong ball
Explain why you have them in this order. Be sure
to use a 5 complete thoughts.
:

Answers

Answer:

Atom, cell, dust particle, ant, ping pong ball

Explanation:

Firstly, atoms make up all matter, including each of the items on that list. The only things smaller than atoms are the parts of the atom itself, protons, neutrons and electrons. Because none of those are on that list, atoms have to be the smallest. Next smallest is the cell. Cells are made up of atoms, but they also in part make up dust. You can see a dust particle with the naked eye, but in order to see a cell you must use a microscope. Thus, cells are smaller than dust particles. Next is an ant. Obviously, an ant is bigger than a speck of dust, and is made up of cells and atoms. Lastly all you have is the ping pong ball, which is much larger than the rest of the items. Hope this helps!

All matter, including each thing on the list, is made up of atoms. The protons, neutrons, and electrons that make up an atom are the only particles smaller than atoms.

Thus,  Atoms must be the tiniest object because none of those are included in that list. The cell is the next smallest. Atoms make up cells, but dust also makes up a portion of them.

A dust particle can be seen with the unaided eye, but a microscope is required to see a cell.

Cells are hence smaller than dust particles. An ant comes next. Of course, an ant is composed of cells and atoms and is larger than a particle of dust.

Thus, All matter, including each thing on the list, is made up of atoms. The protons, neutrons, and electrons that make up an atom are the only particles smaller than atoms.

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A chemist analyzes two samples. One sample contains 14g of element x and 6.0 g of element y. The second sample contains 28 g of element x and samples are the same substance

Answers

Answer:

Explanation:

Here's the complete question:

A chemist analyzes two samples.One sample contains 14g of element x and 6.0g of element y.The second sample contains 28g of element x and 6.0g of element y. Does it appear that the two samples are the same substance?

The two samples that we are given in the question are different. They are not the same thing because we can deduce that their components ratio are different.

Sample One contains 14g of element x and 6.0g of element y. The ratio of element x to y is 14/6 = 7/3 = 7:3.

Sample Two contains 28g of element x and 6.0g of element y. The ratio of element x to y is 28/6 = 14/3 = 14:3.

Therefore, they have different ratio for their components and are therefore not thesame.

Other Questions
In the figure, 1 2, 3 4, and . You can justify the conclusion that TKL TLK by stating _____ what gas is required in order for photosynthesis to occur?a. O2b. H2Oc. CO2d. OH2O Does Jonathan Edwards still believe in God? ASAP! Directions: Place the letter for the correct vocabulary word in the space provided next to the definitions.A. Amendment B. Elastic Clause C. PardonD. Checks and balances system E. Ratification F. ImpeachG. Constitution H. Electors I. ExtraditionJ. Treason K. Militia L. JurisdictionM. Three Fifths Compromise N. Quorum O. BreachP. Habeas Corpus Q. Revenue R. TribunalS. Adjourn T. Ex post facto U. MajorityV. Treaty W. President pro Tempore X. OathY. Apportion Z. Appoint______1. A legal document that frees a person from punishment for a crime.______2. People chosen by the voters in each state to cast official ballots for presidential and vice presidential candidates______3. the power of a court to hear a case______4. separation of powers______5. a volunteer army______6. 50% + 1 more______7. to choose for office______8. an order to bring a person in front of a court______9. To charge a person in public office with misconduct or wrongdoing______10. a promise or vow______11. Paragraph 18 of Section 8 of Article I of the Constitution______12. Formal approval______13. a law that cannot be passed retroactively______14. The surrender of a fugitive to another state______15. process of taking in money through taxes in the Constitutions case______16. majority of members present______17. A set of basic principle on which a government is organized; a plan of government______18. to break/violate a vow or promise______19. the count of slaves in the Constitution______20. an agreement between two nations______21. President of the Senate usually______22. fancy name for a court______23. An act of disloyalty against ones own country______24. to distribute or divide up (as in House of Representative seats)______25. to officially end a meeting usually voted on by Congress at the end of its session______26. A change made in a constitution, bill, or the like by adding a new article. how far from the dog will the suitcase land? you can ignore air resistance. Complete the table for the given rule.Rule: y=x/2(X over 2)X yX 1X 2.5X 3.5 What mass of AuCl3 (MW 303 g/mol) contains 5.0 x 10^23 atoms of Cl? a. 760 g b. 0.838 c. 120 g d. 84ge. 28g What is the tone and mood of Harlem poem? Write an equation that represents the line. Use exact numbers.Please help quickly!! my test is due soon!! Can you help me with this 4x = 8x 1 (5 points) x = three fourths x = 1 x = 3 x = 6 two cruise ships left Maui traveling in the opposite directions. The one heading east was going 12 mph faster than the one heading west. After six hours, the ships were 300 miles apart. How fast did the ship going east travel? A single base substitution can occur in the first, second, or third position of a codon. Propose which position the point mutation is most likely to go unnoticed. Why? Use examples from the codon wheel to support your answer. What are the sweet sounds compared with the songs of The Solitary Reaper? solve: y=5 3x - 2y= 14 Triangle xyz has coordinates x(2, 4), y(3, 4), and z(3, 1). if the triangle is translated using the rule (x, y) (x 2, y 1), what are the coordinates of y'? y'(5, 5) y'(0, 5) y'(5, 2) y'(1, 3) (a) What is Ka of the 2-hydroxyethylammonium ion, HOCH2CH2NH3+ (pKb of HOCH2CH2CH2NH2 = 4.49)? (b) What is the pH of 0.42 M methylammonium bromide, CH3NH3Br? (Kb of CH3NH2 = 4.4 10-4. How do you find the three factors of a polynomial function? If you take a neutron away from an atom, it becomes a different isotope. If you take a proton away from an atom, it becomes a different __________. What one word completes the sentence? What is the quotient of -231 and 3