What is ΔH if 5.5 grams H₂O(l) is formed from this reaction? ( molar mass of H₂O = 18)
H₂(g) + ½ O₂(g) → H₂O(l) ∆H = -285.8 kJ

Answers

Answer 1

Answer:

–87.3 KJ.

Explanation:

The equation for the reaction is given below:

H₂(g) + ½O₂(g) —> H₂O(l) ∆H = -285.8 kJ

Next, we shall determine the mass of H₂O produced from the balanced equation. This can be obtained as follow:

Molar mass of H₂O = 18 g/mol

Mass of H₂O from the balanced equation = 1 × 18 = 18 g

SUMMARY:

From the balanced equation above,

When 18 g of H₂O was produced, ∆H was –285.8 KJ.

Finally, we shall determine ∆H when 5.5 g of H₂O is produced. This can be obtained as illustrated below:

From the balanced equation above,

When 18 g of H₂O was produced, ∆H was –285.8 KJ.

Therefore, 5.5 g of H₂O will produce ∆H of = (5.5 × –285.8) / 18 = –87.3 KJ

Thus, the ∆H when 5.5 g of H₂O was produced is –87.3 KJ.


Related Questions

Silicon dioxide reacts with carbon to form silicon carbide and carbon monoxide as shown in the unbalanced reaction below. Determine the percent yield of silicon carbide if 79.1 grams of carbon reacts with an excess of silicon dioxide and 67.4 g of silicon carbide is actually recovered.
SiO2 + C → SiC + CO

Answers

Excess silicon dioxide" tells us carbon is the limiting reactant, and thus the amount of silicon carbide produced depends on how much carbon is available to react.
*Based on the balanced equation, for every 3 moles carbon reacted, 1 mole silicon carbide is produced.
*Molar mass carbon: 12.01 g/mol
*Molar mass silicon carbide: 28.09 g + 12.01 g = 40.1 g/mol

79.1 g carbon x (1 mol carbon / 12.01 g carbon) x (1 mol silicon carbide / 3 mol carbon) x (40.1 g silicon carbide / 1 mol silicon carbide) = 88.04 g silicon carbide

What is the product of
Mg(NO3)2 + Na2CO3?

Answers

Answer:

MgCO3 + 2 NaNO3

Explanation:

A hydrocarbon was found to contain 82.8% by mass of carbon. It has
an Mr of 58. Find the empirical and molecular formulas of this
compound.

Answers

Answer: C4H10

Explanation: [tex]\left \{ {{12x+y=58} \atop {\frac{12x}{58} =82,8%}} \right. \\[/tex]%

==> x=4, y=10    C4H10

which of the acyclic hydrocarbon series is represented by CnH2n​

Answers

Answer:

alkenes

Explanation:

The general formula for alkenes is CnH2n

Secondary succession can only occur as a transition from primary succession.

Answers

false because it's falsely

Answer:

false

Explanation:

edge 2022

What is the structure of an amino acid? A. Amino group, phosphate group, pentose sugar, nitrogen base B.Amino group, R group, carboxylic acid group C. Amino group, disulfide group. R group D. Phosphate group, pentose sugar, nitrogen base​

Answers

Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure , which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.

Amino group, R group, and the carboxylic acid group. Hence, option B is correct.

What are Amino acids?

Amino acids are the monomers that makeup proteins.

Each amino acid has the same fundamental structure, which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.

Hence, option B is correct.

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Some factories that burn coal produce smoke with harmful chemicals,
such as sulfur. Scrubbers are devices that are attached to the
smokestacks to reduce the amount of sulfur put into the atmosphere. To
evaluate the effectiveness of these devices, what data would need to be
collected?

Answers

Mark Brainliest please


Answer :

The amount of sulfur emitted by a smokestack before and after the scrubber is attached

The amount of sulfur emitted by a smokestack before and after the scrubber is attached.

Hope it helps you I'm from ph❤️

Name a popular polyester​

Answers

Answer:

Terylene

Explanation:

Answer: she or his is right the Terylene is a popular polyester which is used in dress materials. PET (Poly Ethylene Terephthalate) is another example of polyester.M

Explanation:

Hope it helps

The below table compares the number of electrons in two neutral atoms.
atom:
Ne 10
Na 11
Compare the electron configuration and atomic radius of these two atoms and use that to explain the difference in their reactivity.

Answers

Ne 10 has a higher electron configuration because it is closer to Fluorine and fluorine has the highest type on electric config

Formulating an Investigative Question In this experiment, you will use a track and a toy car to explore the concept of movement. You will measure the time it takes the car to travel certain distances, and then complete some calculations. In the space below, write a scientific question that you will answer by doing this experiment.

Answers

Answer:

A scientific question to be asked is; What is the average speed of the toy car?

Explanation:

A scientific question is a question which is well defined, the values in the question can be measured, and the inputs and outputs related to the question are controllable

The parameters measured in the experiment are;

The time elapsed during the movement of the car, Δt

The distance the car moves, d

From the obtained measurements, the value can be calculated is the average speed of the toy car as follows;

[tex]The \ average \ speed \ of \ the \ toy \ car, \ v_{avg} = \dfrac{d}{\Delta t}[/tex]

Therefore, a scientific question to be asked that will be answered by doing the experiment is; What is the average speed of the toy car?

Answer:

Sample Response: How can we change the speed of a toy car on a racetrack to describe the car’s motion?

What did you include in your question? Check all that apply.

a focus on describing the toy car’s motion

a suggestion for a way to change the car’s motion

room for observations and an opportunity to look at motion objective

Explanation:

Can somebody help please to balance those I couldn’t balance it

Answers

Answer:

1.

(NH4)2Cr2O7——>Cr2O7+N2+4H2O

2.

6CO2+6H2O——>C6H12O6+6O2

The solution of sugar at 60.0 degrees celcuis is 290.0 g/ 100 g water. If you add 100.0 g of sugar to 25 g of water at 60.0 degrees celcuis will the sugar dissolve?

Answers

Answer:

you will produce a saturated solution, At 0 degrees Celsius, sugar is claimed to dissolve 180 grams in 100 grams of water. This means that if you dissolve that much sugar in 100 g of water, you'll get a saturated solution.

Explanation:

The correct answer for the given question about Saturated solution is only 72.5 gram will get dissolved and rest which is 27.5 gram will remain undissolved.

How to apply concept of Saturated solution to solve this question?

In question it is given that at 60° C 290 gram of sugar in 100 gram of water produce saturated solution.

So at 60° C  290/100 gram of sugar in 1 gram of water will produce saturated solution.

Hence we can say that  at 60° C  (290/100)×25 gram of sugar in 25 gram of water will produce saturated solution.

means at 60° C 72.5 gram of sugar in 25 gram of water will produce saturated solution.

Now, adding 100 gram of sugar in 25 gram of water.

Since you can only hope to dissolve 72.5 gram at 60°,

Hence the resulting solution will contain undissolved sugar.

So only 72.5 gram will get dissolved and rest which is 27.5 gram will remain undissolved.

Thus, We can conclude that Only 72.5 grams of sugar will dissolve, leaving the remaining  sugar of 27.5 grams undissolved.

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Chemical bonding may involve any of the following except the

1. change in mass in a chemical reaction
2. unequal sharing of a pair of electrons between two nonmetals
3. electrostatic attraction between two ions
4. transfer of an electron from one atom to another

Answers

Answer:

Number 1 is wrong it doesn't change the mass

Chemical bonding may involve any of the following except the " change in mass in a chemical reaction".

What is chemical reaction?

A chemical reaction is referred to as a process which it involves the chemical change of one set of chemical compounds into yet another set of chemical substances.

What is chemical bonding?

A molecule and compound's atoms, ions, and groups of atoms are held together by an attractive force, referred as chemical bond.

Chemical bonding may involve any of the following except the " change in mass in a chemical reaction".

Therefore, the correct answer will be option 1.

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What is the function of the rough
ER?
A. build proteins
B. modify and repackage proteins
C. contains enzymes

Answers

A. build proteins

Explanation:

The endoplasmic reticulum can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function. The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins

How many atoms are in 490 moles of barium?

Answers

Answer:

2.95 * 10^23 atoms

Explanation:

The number of atoms in a mole is always equal to Avogadro's constant, which is 6.02214076×10²³ mol⁻¹.

To find the number of atoms in 0.490 moles of barium, multiply it with Avogadro's constant:

0.490 mol * 6.02214076×10²³ mol⁻¹ ≈ 2.9508 * 10^23

Convert to SigFigs (if necessary):

2.95 * 10^23

Methane is the chief constituent of petroleum fuel
A:yes
B:no

Answers

Yes

Methane also is the chief constituent of natural gas, which contains from 50 to 90 percent methane (depending on the source), and occurs as a component of firedamp (flammable gas) along coal seams.

In the formation of a covalent bond, electrons are …..

A- Gained
B- Transfered
D- Lost
E- Shared

Answers

Answer:

E-shared

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.

Are neutralization reactions always exothermic ?​

Answers

The heat of neutralization is the heat that evolved when an acid and a base react to a form a salt plus water. Neutralization reactions are generally exothermic and is negative.

:]

Explanation:

Neutralisation reactions are not always exothermic. ... When an acid is neutralised by an alkali the reaction is exothermic.SInce strong acids and strong bases are completely dissociated in solution, no formal bonds are being broken. The formation of two very strong covalent bonds between hydrogen and the hydroxide ion is responsible for the neutralization reaction's exothermic character.

hope it helps

stay safe healthy and happy...

What is the basic idea for how to find surface area of any solid?

Answers

Answer:

Find the area of each face that you see and then multiply each area by two to account for the face on the opposite side.

Which of the following statements about the procedure for distillation is false?
A) You should attach metal clips to the water tubes when you attach them to the condenser.
B) You are to continue heating the round-bottom flask until all liquid has been distilled.
C) When setting up the distillation apparatus, you should use 3 metal clamps.
D) As you conduct the distillation experiment, you are to store your fractions, securely sealed with caps and placed standing upright, in a beaker until you are ready to obtain GC data.

Answers

Answer: B) You are to continue heating the round-bottom flask until all liquid has been distilled.

Explanation:

Fractional distillation refers to a method that's useful for the separation of mixtures of solvents whereby there is less than 40°C in the boiling point difference.

With regards to the options given, the incorrect statement about the procedure for distillation is that you are to continue heating the round-bottom flask until all liquid has been distilled. This isn't correct.

The only two elements in alkenes and alkynes are A. Carbon and Nitrogen B. Carbon and Hydrogen C. Oxygen and Nitrogen D. Oxygen and Hydrogen

Answers

Answer:

B. Carbon and Hydrogen

Explanation:

An alkyne can be regarded as unsaturated hydrocarbon which have at least one carbon—carbon triple bond. They are acyclic aliphatic hydrocarbons, they can be (branched or unbranched) , They have general chemical formula of [ CₙH₂ₙ−2]. One of the compound belonging to this family is Propyne( C3H4) Hence, they contain Hydrogen and Carbon.

Alkenes can be regarded as class of hydrocarbons which posses only carbon and hydrogen, they are unsaturated compounds having least one carbon-to-carbon double bond.

alkenes can also be regarded as "olefins". one of the members of this family is Ethene (C2H4). general formula of alkenes can be written as [C nH 2n],

n=number of carbon atoms present in the molecule

Which is a thermosetting plastic?

Polythene
PVC
Melamine
Nylon​

Answers

melamine should be the right answer, i hope this helps.

Chất được chia làm bao nhiêu loại? Lấy ví dụ cho từng loại.

Answers

Chất được chia làm hai loại là đơn chất và hợp chất.
Đơn chất: Cu, Cu2+,...
Hợp chất: CuO, CuCl2,...

Write a report on the implications of entropy to a Christian 500 words

Answers

The universe is "running down," becoming randomly scattered and disorganized, tending to break down into its simple parts. Metals rust, parts wear out, dead organisms decay and turn to dust. The entropy of the universe is increasing.

The Bible provides an answer. A great amount of energy had to be expended to produce such great organization. As one scientist states the problem, energy was not enough. If you are asked to "reduce the entropy" of your room (put it in order), you certainly need to put in some effort (energy). But just adding energy is not enough. You could let loose a bull in your room, and it would expend a great deal of energy; however, that energy would not decrease but would increase the disorder of the room. Therefore, scientists know that to produce order, energy must be intelligently directed. Evolution requires that atoms and molecules assemble themselves into increasing order, but the science of thermodynamics assures us that the entire universe, when left to itself, is converting to disorder. The Apostle Paul referred to this concept when he said through inspiration that the entire earth is "subject to the bondage of decay." The original state required an intelligence to organize the complexities of the universe.

Christians, of course, have an answer to these perplexing questions: God. God is the Creator of the universe, the ultimate source of its energy and order. He created it with no entropy (no disorder). When man sinned, the universe began to increase in entropy (become more and more disordered). For Christians a discussion of energy, thermodynamics, and entropy is inspiring. These subjects invariably point us to the One who created the universe and sustains it by His power. Christians also know that His power will one day totally renew the universe and entropy will have no part in it.

Christians need never be afraid of science. God is in control of the universe and all the laws of the universe operate according to His will and design. Christians should be confident that they have the answers to the perplexing questions of nature.

Part 2

The above attitude allows christians to ignore questions that are difficult and this leads to mental complacency.

"This is gods work. I must not question or touch this". Is their motto.

When christians see difficult questions, such as entropy and creation, that is where they stop thinking and attribute it to god. They become intellectually crippled and refuse to make that one further step. It then halts progress until the shamen can integrate new knowledge into their mantra and dogma.

Science in general, tries to explain and understand and make further progress and additions to human knowledge. Christians will only try to understand what they have been taught and integrate any new knowledge when the older beliefs become untenable.

What is ozone hole?
What causes an ozone hole?

Answers

Answer:

Ozon prevents us from UV rays of the sun. Ozone hole means that UV rays are entering the Earth. This results in cancer.

Explanation:

Chlorofluorocarbons are causing this

Answer:

The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions. People, plants, and animals living under the ozone hole are harmed by the solar radiation now reaching the Earth's surface—where it causes health problems, from eye damage to skin cancer.

Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere.

Using the periodic table, choose the more reactive nonmetal.
Te or O

Answers

the answer is Te because O is oxygen.

Answer:

O

Explanation:

this is because it is oxygen

A warm air moist air mass moves over a cold air mass is most likely to lead to which type of server weather

Answers

a thunderstorm is the severe weather it creates
A thunderstorm is the severe weather that will be created

Identify which of the following statements about the isotopes of an element is correct.

A. They have the same electron configuration.

B. They have the same mass number.

C. They have the same numbers of protons and neutrons in the nucleus.

D. They have more protons than neutrons.

Answers

Answer:

A

Explanation:

because B is wrong as it doesn't have the same mass number. C is wrong as it has different number of neutrons. D is wrong as it has more neutrons than protons.

Household ammonia has a pH of 12; household bleach has a pH of 13. Which of the following statements about these substances is true? Group of answer choices The ammonia has 10 times as many OH- ions as the bleach. The ammonia has 10 times as many H+ ions as the bleach. A solution that could buffer the bleach and ammonia would remove excess OH- ions. Both of these substances are strong acids.

Answers

Answer:

The ammonia has 10 times as many H+ ions as the bleach.

Explanation:

pH is defined as -log[H+]

[H+] of ammonia is = 10^-12 = 1x10-12M

Bleach = 1x10-13M

pOH = 14-pH = 2 for ammonia and 1 for bleach

[OH-] = 10^-pOH = 0.01M for ammonia and 0.1M for bleach

Thus:

The ammonia has 10 times as many OH- ions as the bleach. FALSE.

The ammonia has 10 times as many H+ ions as the bleach. TRUE.

A solution that could buffer the bleach and ammonia would remove excess OH- ions. FALSE. A buffer maintains OH- ion concentration

Both of these substances are strong acids. FALSE. Strong acids have pHs < 7

What are some properties that can be used to determine a chemical reaction has occurred?

Answers

Answer:

Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer:

Change in Color

Heat is released (bubbles in solution)

Sometimes even a change in texture

A new smell

Formation of a precipitate

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An investor purchases 1,000 mutual fund shares with a Net Asset Value of $10 each, where the fund imposes a 5% contingent deferred sales charge if the shares are redeemed within the first year. The sales charge decreases by 1% for each year the investor remains invested in the fund. If the investor were to redeem his shares during the second year of holding the fund, based upon the NAV of $10, he or she will receive:A. $10,000 B. $9,600 C. $9,500 D. $9,400 Some factories that burn coal produce smoke with harmful chemicals,such as sulfur. Scrubbers are devices that are attached to thesmokestacks to reduce the amount of sulfur put into the atmosphere. Toevaluate the effectiveness of these devices, what data would need to becollected? Pls! Help me :( What are the no una, verbs and adjectives? 1. The brown dog ran away from our house.2. The child plays at the hot beach.3. The big house on my street was painted.4. He ate a good cheeseburger with Diana.5. They went to school by yellow taxi.6. We picked purple flowers in the field.7. They drank soda in the small cafeteria.8. The blue birds fly to Florida. To encourage people to enter the race, organizers include the following quote: "Until one is committed, there is hesitancy, the chance to draw back, always ineffectiveness. Concerning all acts of initiative and creation, there is one elementary truth the ignorance of which kills countless ideas and splendid plans: that the moment one definitely commits oneself, then providence moves too. All sorts of things occur to help one that would never otherwise have occurred. A whole stream of events issues from the decision, raising in one's favor all manner of unforeseen incidents, meetings and material assistance which no man could have dreamed would have come his way. Whatever you can do or dream you can, begin it. Boldness has genius, power and magic in it. Begin it now." - Goethe Discuss the effect this quotation might have on someone who is afraid of entering the race. Which of these are characteristics of third-person limited point of view? Check all that apply.AbelThe reader's access to information is not limited to any one character.The narration follows the thoughts and feelings of only one character.The reader's access to information is limited to just one character.The narration follows the thoughts and feelings of all of the characters.The thoughts and feelings of secondary characters are revealed through their words and actions.Mark this and returnSave and ExitNextSubmit Dan, Harry and Regan sell cars.Dan sells x cars.Harry sells 5 more cars than Dan.Regan sells twice as many cars as Dan.Write an expression, in terms of x, for the mean number of cars Dan, Harry and Regan sell. 1/6 of a farm is planted maize,1/4 is planted beans and the remaining part is planted potatoes.What fraction of field is planted potatoes? i have no idea what im doing HELP ME PLZ AND THANKS I WILL MARK YOU AS BRAINLIEST!!! Round 382 to 1 significant figure Simplify 5(x + y) -3(x - y) There was a very long line at the pharmacy. A pharmacy technician told an elderly lady at the end of the line to step ahead of the others. Which ethical principle was violated?a. beneficenceb. nonmaleficencec. justiced. fidelity Rob consumes two goods, x and y. He has an allowance of $50 per week and is not endowed with either of the goods. If the price of good x increases and his substitution and income effects change demand in opposite directions.a. good x must be a Giffen good.b. good x must be an inferior good.c. WARP is violated.d. good x must be a normal good.e. There is not enough information to judge whether good x is a normal or inferior good. what is the value n ? Choose the correct form of the adverb to complete the sentence below. Look at the degree of comparison given in parentheses to help guide you.Jenessa visited the old lady___ . (comparative)options:1. most often2. more often3. often Classity each of the following items as a final good or an intermediate good, and classifly the expenditure on each final good. Item 1. A DVD bought by a household. item 2. New computers bought by PepsiCo Item 3. New aircraft bought by Southwest Airlines item 4. Fertilizer bought by a Florida tomato grower. Item 1 is ________ and Item 2 _________. literally help meee because I don't understand please help me which of those statements describe electromagnet waves chose the three that apply given that the graph below is a transformation of the graph f(x)=x2, which transformation occurred?