Answers
This seems to be a Hess' Law problem. Hess' Law states that "states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes." (Libretext)
Compare the step reaction to the final reaction to see the similarity and differences. We may have to flip an equation or multiply it by a constant to obtain the number of moles of the species in the final equation. Just remember, whatever we do to the equation, we have to do to the ΔH as well.
3C + 4H₂ → C₃H₈ ΔH= +104 kJ [1]
C + O₂ → CO₂ ΔH= -394 kJ [2]
2H₂ + O₂ → 2H₂O ΔH= -572 kJ [3]
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O ΔH = ?
_____________________________________________
Compare the Equation
Equation [1]
In [1] the C₃H₈is on the product side. But the final equation has the C₃H₈ on the reactant side. Thus we have to flip the equation. This flips the sign of ΔH.
C₃H₈ → 3C + 4H₂ ΔH= - 104 kJ [1]
Equation [2]
The CO₂ in the final equation is on the product side but is 3 moles. Thus we have to multiply [2] by three. The ΔH is also multiplied by 3.
3C + 3O₂ → 3CO₂ ΔH= 3 (-394 kJ) [2]
Equation [3]
The H₂O in the final equation has a coefficient of 4. Thus we have to multiply [3] by 2.
4H₂ + 2O₂ → 4H₂O ΔH= 2(-572 kJ) [3]
Combine the Equations
Combine the newly sorted versions of the equation and simplify to see if it matches the final equation. We also add the ΔH.
⇒ C₃H₈ + 3C + 3O₂ + 4H₂ + 2O₂ → 3C + 4H₂ + 3CO₂ + 4H₂O
ΔH= - 104 kJ + 3 (-394 kJ) + 2(-572 kJ)
⇒ C₃H₈ + + 5 O₂ → 3CO₂ + 4H₂O
ΔH= - 104 kJ + 3 (-394 kJ) + 2(-572 kJ) = −2430 kJ
∴ the ΔH of the final equation is −2430 kJ.Related Questions
why is water able to easily dissolve ionic compounds?
Answers
Answer:
To dissolve an ionic compound
Explanation:
the water molecules must be able to stabilize the ions that result from breaking the ionic bond. They do this by hydrating the ions. Water is a polar molecule. ... When you place an ionic substance in water, the water molecules attract the positive and negative ions from the crystal.
who originally proposed the concept that matter is composed of tiny indivisible particles
Answers
Answer:
Aristotal
His view of atoms was very different from how we think of atoms now but he was technically the first person to propose the basic idea of atoms.
why is propene the second member of the alkene homologous series?
why is it not ethene?
Answers
Answer:
Because alkenes are hydrocarbons with at least one carbon-carbon double bond the alkene homologous series starts at ethene C2H4.
Explanation:
Explain why rubidium is less reactive than caesium.
Answers
Answer:
Like other alkali metals, rubidium metal reacts violently with water. As with potassium (which is slightly less reactive) and caesium (which is slightly more reactive), this reaction is usually vigorous enough to ignite the hydrogen gas it produces.
Explanation:
A woman is swimming across a cold lake. Her body temperature is 98 degrees and the lake water is 60 degrees. Which has more thermal energy, the woman or the lake? Explain your answer!
Answers
I think the lake because of how heat is transferred or something. Just check out the first law of thermodynamics.
Answer:
the woman
Explanation:
what phenomenon is the basis behind the ability to separate miscible liquids by distillation?
Answers
Answer:
The basis of the separation by steam distillation is that while the water and organic condensed phases are immiscible, the vapors of both are miscible. Once condensed, the two separate again allowing for an easy separation. As noted above, both liquids and solids can be distilled by steam.
Explanation:
I hope this helps!
Are two atoms of the same element identical?
Answers
Answer
Two atoms of the same chemical element are typically not identical. ... Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are differenter:
Explanation:
Matter is defined as anything that has blank and blank
Answers
Answer:
Matter is anything that has mass and occupies space.
If it takes 40 joules to heat a piece of barium weighing 20g from 10.0°C to 17.0°C, what is the specific heat of the barium?
Answers
Answer:
The specific heat of Barium is 0.204 J/g K
Is oxygen likely to gain or lose electrons when boding? Explain.
Answers
True or False: Polyatomic ions do not have a charge.
True or false: lonic compounds must have prefixes.
Answers
Answer:
first false
second false
You forgot to dry the bread knife when you washed it and reddish brown spots appeared on it. is it chemistry or physical change?
Answers
Answer:
Chemical because water + metal = rust.
Explanation:
A new substance was formed.
What type of elements are found in each group?
Answers
Group 1 of the periodic table consists of hydrogen and the alkali metals. ...
Group 2 consists of the alkaline Earth metals. ...
Groups 3–12 contain transition metals. ...
Groups 13–16 each contain at least one metalloid. ...
Group 17 contains halogens. ...
Group 18 consists of noble gases.
Answer:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
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How can you destroy the world by controlling
matter or atoms?
Answers
Answer:
Make them all gather up at the core of the Earth so it will attract everything towards it and practically just condense the planet.
But why are you even planning to do that? :/
The fastest man can run 100 meters in 10 seconds. What is his speed in miles per hour?
Answers
Answer:22.37 mph
Explanation:
100 meters = 0.062137 miles
Assume constant speed over the distance.
0.062137 miles in 10 sec
0.372822 miles in 60 sec = 1 minute
22.36932 miles in 60 minutes
22.37 mph rounded to 2 decimals
a boiling pot of soup with a lid on it to keep in the energy is what type of system?
Answers
Answer:
Closed system. :)
Explanation:
When the lid on the pot of soup is closed, it means matter can no longer escape, which in turn, makes it a closed system. I hope this helps, please let me know if you have any further questions
What happens when the light enters the water and then when it leaves the water?
Answers
Answer:
As light initially enters the water, it is refracted as in figure (b) and then reflected off the mirror (at the bottom of the glass). Upon exiting the water, the light is bent away from the normal as it passes from water (more dense) and into air (less dense).
¿cuáles son las ventajas de un experimento científico?
Answers
Answer:
Explanation:
Hacer proyectos de ciencia ayuda a desarrollar el ingenio de un niño
Discussion: Bacteria vs. Virus
Instructions: Watch the video below.
In complete sentences:
-Tell me three facts you learned about viruses
-Based on the information we learned about cells, tell me two different ways that viruses are different from bacteria.
(Your response should be five sentences total.)
Answers
Viruses aren’t considered organic.
Bacteria has a nucleus and cell membranes while viruses don’t
Viruses are not considered organic while bacteria are.
What causes an earthquake?
Answers
Answer:The earths plates shifting
Explanation: The movement releases stored-up 'elastic strain' energy in the form of seismic waves, which propagate through the Earth and cause the ground surface to shake.
Which of the following led to the Middle English language of Chaucer?
American Indians' word choice and language
Anglo-Saxon tribes that came from Germany
Modern English factors after years of struggle and invasion
Normans from France who conquered the Anglo-Saxons
Answers
Answer:
i believe it the last one
Explanation:
What does a flat, horizontal line mean on a
DISTANCE-time graph?
Speeding up
Travelling at a constant speed
Not moving (motionless, stationary)
Answers
Answer:
Explanation:
A straight horizontal line on a speed-time graph means that speed is constant. It is not changing over time. A straight line does not mean that the object is not moving!
English
1
2
3
4
5
6
18010
►
Which change of state is taking place?
lose together but can slide
ms lose energy, they move
ocked in place because of
em.
gas to solid
gas to liquid
liquid to solid
solid to liquid
Answers
Answer:
gas to liquid is condensation
liquid to solid is freezing
solid to liquid is melting
gas to solid is deposition
in order for a substance to be an effective mobile phase in a chromatography experiment, it must be able to move
Answers
In order for a substance to be an effective mobile phase in a chromatography experiment, it must be able to move different components of a mixture at different rates.
Chromatography involves the separation of substances using the application of the solubility differences in them. It has two phases known as the stationary and mobile phases.
The mobile phase involves motion which is why the ability of substances to move at different rates is a great factor in this type of phase. The Stationary phase on the other hand doesn't involve movement of substances.
Read more on https://brainly.com/question/25194414
Which color of light has the highest energy?
green
red
blue
violet
Answers
Answer:
Violet
Explanation:
It has the shortest wavelength and therefore the highest frequency.
what is the younger rock layer
Answers
The youngest rock layers are at the top and the oldest are at the bottom, which is described by the law of superposition.
why all carbon containing atoms are not organic?
Answers
Answer:
Carbon oxides and carbonates are exceptions; they contain carbon but are considered inorganic because they do not contain hydrogen. The atoms of an organic molecule are typically organized around chains of carbon atoms. Inorganic compounds make up 1%–1.5% of a living cell's mass.
Answer:
They are made up of only one type of element, which is carbon, and therefore would fail to be categorized as an organic compound since they are not, in the first place,a compound, but a pure element.
Explain how CMB is observed on the Earth?
Answers
Answer:
the speed of light (all photons, naturally including those from the CMB, travel at the speed of light relative to you, regardless of frame or your velocity).
But I suspect you’ve asked this question because of a totally understandable but not quite correct set of assumptions about the universe. If my hunch is correct, you understand the CMB a bit like the skin of a balloon, gradually expanding over time. The Earth is a point somewhere in this balloon, and you’re asking about the Earth’s velocity relative to perhaps the center of this balloon. But that’s not quite how the universe works. It’s far more strange.
Our best hypothesis thus far is that the Big Bang happened from a single point. The “space” around us IS that single point. There is no origin point, since everywhere is by definition the origin point. You can see this for yourself by noticing that basically every star and galaxy we can see is - in the long run - moving away from us. And this is true regardless of whether you are on Earth or another star, or any point in the universe. So from this, it doesn’t really make sense to ask what the velocity of the earth is relative to the CMB rest frame, because space itself is expanding. Hopefully haven’t caused too many headaches!
Explanation:
Which electrons are represented by the dots in an electron dot structure?
a. valence electrons
b. inner level electrons
c. only s electrons
d. both a and c
Answers
Answer:
A
Explanation:
because valence electron is the outer shell of electrons.
hope this helps you to understand :)
Combustion reactions take place between fuel and oxygen and produce carbon dioxide and water. Balance
the following combustion reaction.
Answers
This is a combustion reaction of an alkane with oxygen. It is exothermic (
Δ
H
<
0
), and can be balanced in normal methods for balancing chemical equations ie ensuring that the total number of atoms of each element is the same on both sides of the equation.