Consider the following balanced thermochemical equation for a reaction sometimes used for H₂S production: 1/8 S₈(s) + H₂(g) → H₂S(g) ΔH = -20.22kj
(d) What is ΔH when 25.0 g of S₈ reacts?
Answers
ΔH = -15.78 KJ when 25.0 g of S₈ reacts.
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The given reaction balanced equation is:
1/8 S₈(s) + H₂(g) → H₂S(g) ΔH = -20.22kj
Now,
When 1 mol will react, then ΔH = -20.2 × 8
= -161.6 KJ
When 1 mol of S8 = 8 × 32 g
= 256 g
When 256g of S8 react ΔH = -161.6 KJ
When 1 g reacts, ΔH = \(\frac{-161.6}{256}\)
=- 0.63125 KJ
When 25 g reacts, ΔH = - 0.63125 × 25
= -15.78 KJ
Thus from the above conclusion we can say that ΔH = -15.78 KJ when 25.0 g of S₈ reacts.
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Related Questions
If we add 150mL of ammonia to 150mL of water, what is the concentration by volume?
Answers
Answer:
buffer solution
Explanation:
2-Naphthol and Iodobutane are reacted in the presence of NaOH and EtOH as the solvent to produce 2-butoxynaphthalene (an ether). This is an SN2 reaction where naphthol gets deprotonated to form an alkoxide that will react with Iodobutane. In this reaction, why is the experimental yield of 2-butoxynaphthalene so low. Are there any side reactions that might get in the way of producing the product?
Answers
The low experimental yield of 2-butoxynaphthalene in the reaction between 2-naphthol and iodobutane can be attributed to several factors, including side reactions that compete with the desired reaction.
One possible side reaction is the formation of an elimination product. In the presence of a strong base like NaOH, the alkoxide formed from the deprotonation of 2-naphthol can undergo elimination, leading to the formation of an alkene instead of the desired ether. This side reaction occurs via an E2 mechanism, where the alkoxide acts as a nucleophile attacking the hydrogen on a beta carbon, resulting in the removal of a leaving group and the formation of a double bond. Another possible side reaction is the formation of a substitution product other than 2-butoxynaphthalene. The reaction between the alkoxide and iodobutane follows an SN2 mechanism, where the alkoxide acts as a nucleophile displacing the iodide ion. However, other nucleophilic sites on the naphthalene ring or on the iodobutane molecule can also react, leading to the formation of different substitution products.
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How do the elements in each group differ? How are they similar?
Answers
Explanation:
All the elements in one group have the same number of valence electrons. The valence electrons are those on the energy level the most distant from the nucleus. These valence electrons are those involved in bonding with other atoms to form compounds.
In the periodic table elements in the same group posses similar physical and chemical property and this is due to the similarity in the number of valence electrons found in their valence shells.
While in the periodic table as we move down a group the atomic number of the elements will continue to increase because elements in the same group are located in different periods as well.
Hence we can conclude that the difference in the elements located in a group is that they have different atomic numbers while the similarities is that the posses the same number of valence electrons.
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Do the follow reactions depict Heat of Formation Reactions? If so, mark the reaction as YES, if it is not a Heat of Formation Reaction, then choose NO.
NoYes CO2(g) + C(gr) → 2CO(g)
NoYes 2Fe2O3(s) → 4Fe(s) + 3O2(g)
NoYes H2(g) + 1/2O2(g) → H2O(g)
NoYes HgS(s) + O2(g) → Hg(l) + SO2(g)
NoYes Ni(s) + 4CO(g) → Ni(CO)4(g)
Answers
The first reaction is YES, the second reaction is NO, the third reaction is YES, the fourth reaction is NO, and the fifth reaction is YES.
Heat of formation reactions involve the formation of one mole of a substance from its constituent elements in their standard states with a release or absorption of heat.
In the first reaction, \(CO_2\) is formed from its elements C and O2, and the reaction releases heat, making it a heat of formation reaction.
The second reaction does not involve the formation of a new compound, but rather a decomposition of \(Fe_2O_3\), so it is not a heat of formation reaction.
The third reaction involves the formation of \(H_2O\) from H2 and O2, releasing heat, making it a heat of formation reaction.
The fourth reaction does not involve the formation of a new compound, but rather a combustion reaction, so it is not a heat of formation reaction.
The fifth reaction involves the formation of Ni(CO)4 from Ni and CO, releasing heat, making it a heat of formation reaction.
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No - This reaction is not a heat of formation reaction. Yes - This reaction is a heat of formation reaction. Yes - This reaction is a heat of formation reaction. No - This reaction is not a heat of formation reaction. Yes - This reaction is a heat of formation reaction.
Reactions involving the creation of one mole of a compound from its component elements in their standard states are known as heat of formation reaction. At a given temperature and pressure, an element's standard state is its most durable state. The enthalpy shift that occurs when a compound is created from its component parts is known as the heat of creation.
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What is the molarity of a 50.0 mL solution that contains 0.65 moles of
Sodium sulfate?
Answers
\(\\ \sf\longrightarrow Molarity=\dfrac{Moles\:of\:solute}{Volume\:of\: solution\:in\:L}\)
\(\\ \sf\longrightarrow Molarity=\dfrac{0.65}{0.05}\)
\(\\ \sf\longrightarrow Molarity=0.13M\)
In injection molding, mold temperature, melt temperature, and injection speed are known to affect the crystallinity of the product. You are expected to answer the following questions based on the attached article (Rizvi, S.J.A., International Journal of Plastics Technology volume 21, 404–426 (2017) that relates these process parameters to crystallinity. --List and
1) discuss the characterization methods to quantify the crystallinity of the molded sample.
Answers
The characterization methods to quantify the crystallinity of the molded sample in injection molding are X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC).
X-ray diffraction (XRD) is a characterization technique that is used to analyze crystalline materials such as ceramics and minerals. The technique is also used to determine the structure of macromolecules such as proteins and large organic molecules. XRD uses high-energy X-rays to interact with the material, producing diffraction patterns that are specific to the structure of the material. The diffraction patterns can be used to determine the degree of crystallinity of the material.
Differential Scanning Calorimetry (DSC) is a characterization technique that measures the difference in heat flow between a sample and a reference material as a function of temperature or time. DSC is used to measure the thermal properties of materials, including the melting point, glass transition temperature, and degree of crystallinity. In DSC, a sample is heated or cooled at a constant rate, and the heat flow is measured as a function of temperature. The degree of crystallinity is determined by comparing the heat flow of the sample to that of a completely amorphous material.
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The general format AB+CD→AD+BC represents a ____________ reaction.
A. exchange
B. replacement
C. decomposition
D. synthesis
Answers
Answer:
D aka synthesis
Explanation:
Got question and got it right :) have a good rest of your day
What is the percentage of oxygen normally found in air?
A) 14.7 percent
B) 18 percent
C) 19.5 percent
D) 21 percent
Answers
The percentage of oxygen normally found in air is: 21 percent
Air is composed of a mixture of gases, including oxygen, nitrogen, carbon dioxide, and trace amounts of other gases.
Oxygen is essential for supporting life and is necessary for various biological processes, including respiration.
The Earth's atmosphere is predominantly made up of nitrogen gas (approximately 78 percent) and oxygen gas (approximately 21 percent). The remaining percentage consists of trace gases such as carbon dioxide, argon, neon, helium, and others.
The 21 percent oxygen content in the atmosphere is crucial for the survival of organisms that rely on oxygen for respiration.
It allows for the efficient exchange of oxygen in the lungs and subsequent transportation of oxygen to body tissues.
It's worth noting that the composition of the atmosphere can vary slightly depending on factors such as location, altitude, and environmental conditions.
However, the 21 percent figure represents the average percentage of oxygen in the Earth's atmosphere and is commonly used as a reference.
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Electrons in an atom are arranged in layers, or shells. For example, an atom of titanium has two electrons in its innermost electron shell. The next two layers contain eight and ten electrons, and the outermost layer contains two electrons. What does the number of electrons in the outermost shell of an element indicate?
A.
How many protons and neutrons are in an atom
B.
Whether an element is likely to bond with other elements
C.
What state of matter an element is usually found in
D.
Whether an element is radioactive
Answers
Answer:
whether an element id radioactive
This type of chemist understands the structure of living systems and, in turn, their
functions and ways to control them.
Answers
A Biochemist is a type of chemist understands the structure of living systems and, in turn, their functions and ways to control them.
What is the chemistry of living systems called?The chemistry of living system is known as Biochemistry.
Biochemistry is a study of the chemical changes that occur in living organisms.
Scientists that study biochemistry are called Biochemists.
Biochemistry studies the structure and function of biological molecules such as carbohydrates, lipids, proteins, e.t.c., as well the chemical reaction they undergo.
Biochemistry also studies the energy changes that occur in living systems.
In conclusion, the chemistry of living systems is called Biochemistry.
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determine the net change in nadh , fadh2 , and gtp from the passage of two acetyl-scoa molecules through the citric acid cycle. degradation of one molecule of glucose yields two acetyl-scoa molecules.
Answers
The net change in NADH , FADH2 , and GTP is : NADH : 6 molecules, FADH2 : 2 molecules, and GTP : 2 molecules.
The citric acid cycle is the also called as the krebs cycle. it is also called as the TCA cycle. it is the series of the chemical reactions occurs to release the energy that is stored through the oxidation of the acetyl CoA. the net change in NADH , FADH2 , and GTP from the passage of two acetyl-CoA molecules through the citric acid cycle. degradation of one molecule of glucose yields two acetyl-CoA molecules.
The NADH = 6 molecules
The FADH2 = 2molecules
The GTPP = 2 molecules
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For every 1 mole of H2(g) produced, how many moles of electrons are transferred in the electrolysis of water
Answers
In an electrolytic cell, commonly made of platinum, electrolysis takes place between a positively charged anode and a negatively charged cathode.
Thus, Two half-reactions that take place at the cathode and anode make up the chemical reaction for water electrolysis. At the cathode, a reduction reaction takes place as hydrogen ions pick up electrons and change into hydrogen gas.
The separation of hydrogen and oxygen from water is demonstrated by the water electrolysis reaction.
Two moles of water are converted into two moles of hydrogen and one mole of oxygen. The amount of hydrogen produced is twice that of oxygen in moles. Between the electrodes and the electrolyte, charges are also exchanged.
Thus, In an electrolytic cell, commonly made of platinum, electrolysis takes place between a positively charged anode and a negatively charged cathode.
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please help quickly
Rubia was given a type of inclined plane called a ramp in her science class. Her teacher told her that the ramp should have a mechanical advantage of 3.
Rubia pulled a block up the ramp, but afterward she calculated that the mechanical advantage of the ramp was 2.8 instead of 3. Her teacher said she did not make a mistake. What did Rubia calculate?
A.
the actual operating power of the ramp
B.
the actual mechanical advantage of the ramp
C.
the ideal mechanical advantage of the ramp
D.
the ideal operating power of the ramp
Answers
Answer: B. The actual mechanical advantage of the ramp.
Explanation:
The professor saying that the ramp SHOULD have a mechanical advantage of 3 indicates that that would be the ideal mechanical advantage. Since Rubia calculated it to be 2.8, that means that it is the acutal mechanical advantage. The actual advantage will be reduced from the ieal due to things like friction.
A balloon is filled with warm air and placed inside a freezer. After a few minutes, the balloon shrinks. Which of the following most likely happened during the transition?
Owarmer air inside the balloon pushes on the walls of the balloon and the air escapes into the surroundings.
O The warm air molecules inside the balloon loose energy to the cold air molecules, they move slower, and condense
OAs the temperature drops, the warm air molecules gain energy and become more attracted to each other.
O The balloon transfers energy to the cold air, and the cold air gains energy to compress the balloon
Answers
Answer: Option: B - The warm air molecules inside the balloon lose energy to the cold air molecules, they move slower, and condense.
Explanation: Warm air molecules move faster than cold air molecules.
What happens in radioactive decay to the atom
Answers
Answer:
When radioactive atoms decay, they release energy in the form of ionizing radiation (alpha particles, beta particles and/or gamma rays). The energy is called ionizing radiation because it has enough energy to knock tightly bound electrons from an atom's orbit. This causes the atom to become a charged ion
Helllpppp I will give you branliest!!! In which cell organelle is DNA found?
Answers
Answer:
nucleus
Explanation:
Answer:
Found in the nucleus
Explanation:
I hope this answer is correct and helpful!
HELP PLZZZ !!!!!!!!!!!!
Answers
Answer:
1/ 421.2 g KNO3
2/ 66.6 g S
3/ 275.0 g CO2
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
what determines the order in which the component elements of binary compounds are written?
Answers
The order of component elements in binary compounds is determined by the electronegativity of the elements. The element with higher electronegativity is usually written first.
In binary compounds, the order of component elements is determined by the electronegativity of the elements. Electronegativity is a measure of an atom's tendency to attract electrons towards itself in a chemical bond. The element with higher electronegativity is more likely to attract electrons, making it more negatively charged in the compound. The convention is to write the element with higher electronegativity first and the element with lower electronegativity second. This ordering reflects the transfer or sharing of electrons in the compound. For example, in sodium chloride (NaCl), sodium has lower electronegativity than chlorine, so sodium is written first.
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Draw the structure of the major organic product(s) for the following reaction between an acetylenic anion and an alkyl halide
Answers
When an acetylenic anion (a negatively charged alkyne) reacts with an alkyl halide (an organic compound with a halogen atom bonded to an alkyl group), it undergoes a nucleophilic substitution reaction. The acetylenic anion acts as the nucleophile, attacking the electrophilic carbon atom of the alkyl halide.
The product(s) of this reaction depends on the specific acetylenic anion and alkyl halide used. Generally, the major product will be an alkene with the alkyl group attached to the carbon-carbon triple bond. The halogen from the alkyl halide is typically replaced by the hydrogen from the acetylenic anion.
Acetylenic anion (RC≡C⁻) + Alkyl halide (R'-X) → Substituted alkyne (RC≡CR') + Halide anion (X⁻)
R and R' represent alkyl groups, and X represents a halide (such as Cl, Br, or I). The acetylenic anion acts as a nucleophile, attacking the electrophilic carbon in the alkyl halide. The halide anion is released as a byproduct.
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the cowardly lion and the hungry tiger objective
Answers
Answer:
It is one of the six Little Wizard Stories of Oz. The Cowardly Lion and the Hungry Tiger have grown bored with their guard duty at Ozma's throne in the Royal Palace of the Emerald City. The Lion wants to attack a man and make "chop suey of him." The Tiger longs, at last, to satisfy his hunger for a fat baby.
Explanation:
i hope this help u
Using the information provided in the picture, where would we find the
water with the highest concentration of pollution?
Select one:
A: Point x
B: The Northern White River
C: Point z
D: Point Y
Answers
Answer:
b
Explanation:
According to the law of conservation of energy, what will most likely happen in a closed system?
O Energy will be exchanged along with matter.
Energy will be exchanged, but matter will not be exchanged.
Energy will be created along with matter.
Energy will be destroyed, but matter will not be destroyed.
Answers
Answer:
the answer is Energy will be exchanged, but matter will not be exchanged.
this because that in a closed system energy is able to be transfered but matter cant.
hope this helps
Answer:
b
Explanation:
none
What of these should Hailey include in her list?
Synthetic polymers are biodegradable.
Synthetic polymers are not flexible.
Synthetic polymers are recycled cheaply.
Synthetic polymers are inexpensive to produce.
Answers
Answer:
Hailey should add, they are inexpensive to produce.
Explanation:
Reason being why they are inexpensive to produce, is due to them being chemical based and easy to product in the factory setting. Which makes them extremely cheap to make.
Reason being why the others are wrong, synthetic polymers are not biodegradable as they are made in a factory with oils. Synthetic polymers are not flexible due to them being used for harder products. Synthetic polymers are not recycled cheaply as they are made with chemicals which makes it very hard to recycle.
answer:D
Explanation: i took it
PLEASE HELPPPP what characteristics of the bond you choose are persent in H2O.
Answers
What factors do you think might cause the climate to change?
Answers
Answer:
the main cause of climate change is burning fossil fuels such as oil, gas, and coal. When burnt, fossil fuels release carbon dioxide into the air, causing the planet to heat up.
Explanation:
A tapeworm attaches to the wall of its host’s intestine and starts to absorb the host’s nutrients. Eventually this can cause great harm to the host as the host loses many important nutrients.
Which type of infectious agent is a tapeworm?
a virus
a bacterium
a fungus
a parasite
Answers
Answer:
A parasite.
Explanation:
A virus usually invades cells and replicates.
A bacteria usually just replicates and either is beneficial or can harm.
A fungus usually decomposes or can make you sick.
A parasite usually is parasitism - it invades the organisms and leeches off them for shelter and nutrients and can harm.
Answer:
A parasite.
Explanation:
i got it right
name the complex zncl2(en)2. the oxidation number of zinc is +2.
Answers
The name of the complex ion ZnCl2(en)2 is "dichloridobis(ethane-1,2-diamine)zinc(II)".
Here's how the name is derived:
The complex contains the metal ion zinc, which has a +2 oxidation state, so we use the Roman numeral (II) to indicate this in the name.
The complex contains two chloride ions, which are named as "dichlorido" since there are two of them.
The complex also contains two molecules of ethane-1,2-diamine, which is abbreviated as "en". The two en ligands are named using the prefix "bis".
Therefore, the complete name of the complex ion is "dichloridobis(ethane-1,2-diamine)zinc(II)".
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How many moles of hydrogen
gas
are contained in 21.3 L at
STP?
E: PV = nRT
use R =
G / P = 1atm
T = 273K
V = 21.3L
U:n = [?] mol
*
0.0821 Latm
mol. K
Answers
0.951 moles of hydrogen gas are contained in 21.3 L of STP.
What is an ideal gas law ?Ideal gas law is also called as real gas law. It is defined as for any gas, its volume (V) multiplied by its pressure (P) is equal to the number of moles of gas (n) multiplied by its temperature (T) multiplied by the ideal gas constant, R.
By using the ideal gas law equation;
PV=nRT
where,
P - Pressure of the gas
V - Volume occupied by the gas
n - number of moles of gas present
R - universal gas constant, usually given as 0.0821
T - absolute temperature of the gas
STP conditions are defined as a pressure of 1 atm and a temperature of 273.15 K.
By putting this value in given equation
n = 1 × 21.3 / 8.314 × 273
= 0.951 moles.
Thus, 0.951 moles of hydrogen gas are contained in 21.3 L of STP.
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What is a "siege machine"?
Answers
Answer:
A siege engine is a device that is designed to break or circumvent heavy castle doors, thick city walls and other fortifications in siege warfare. Some are immobile, constructed in place to attack enemy fortifications from a distance, while others have wheels to enable advancing up to the enemy fortification.
Explanation:
The absolute value of the chemical potential
(a) Is known
(b) Is approximately known
(c) Is not know
Answers
The answer is (c) Is not known. The absolute value of the chemical potential is unknowable.
Chemical potential (\(\mu\)) is a thermodynamic term used to define the transfer of a component from one phase to another at constant temperature and pressure.
It is the variation of Gibbs free energy (\(G\)) with respect to the number of molecules (\(N\)), temperature (\(T\)), and pressure (\(P\)).
\(G = H - TS\)
where \(H\) is the enthalpy of the system, \(T\) is the temperature at which the system is held, and \(S\) is the entropy of the system.
\(\mu = \left(\frac{{dG}}{{dN}}\right)_{T,P}\)
\(\mu = \mu_0 + RT \ln a\)
where \(R\) is the universal gas constant, and \(a\) is the activity of the chemical component.
The absolute value of the chemical potential (\(\mu\)) is the chemical potential of an element or compound in its purest form in its standard state.
This value is impossible to calculate. So the answer is (c) Is not known.
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