The enthalpy change for the given reaction is 1344 kJ/mol.
First, we need to write the balanced chemical equation for the given reaction:
HCN(g) + 2 H2(g) → CH3NH2(g)
To calculate the enthalpy change (ΔH) for this reaction, we need to subtract the total energy of the reactants from the total energy of the products. We can do this by calculating the energy required to break the bonds in the reactants and the energy released when new bonds are formed in the products.
Reactants:
HCN(g): 1 C-N bond (305 kJ/mol) + 1 C-H bond (413 kJ/mol) + 1 N-H bond (391 kJ/mol) = 1109 kJ/mol
2 H2(g): 4 H-H bonds (4 x 432 kJ/mol) = 1728 kJ/mol
Total energy of reactants: 1109 kJ/mol + 1728 kJ/mol = 2837 kJ/mol
Products:
CH3NH2(g): 1 C-H bond (413 kJ/mol) + 3 C-N bonds (3 x 305 kJ/mol) + 7 H-H bonds (7 x 432 kJ/mol) = 4181 kJ/mol
Total energy of products: 4181 kJ/mol
ΔH = (total energy of products) - (total energy of reactants)
ΔH = 4181 kJ/mol - 2837 kJ/mol
ΔH = 1344 kJ/mol
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What’s a zinc cup made of
Answer:
constructed as a cylindrical container for the battery cell, and a carbon rod surrounded by a compound with a higher Standard electrode potential (positive polarity), known as the cathode, that collects the current from the manganese dioxide electrode
Explanation:
is this what you are talking about?
What changes sodium pellets to liquid
Answer:
when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.
Explanation:
When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.
What are the properties of sodium?Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.
It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.
It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.
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Malic Acid is found in?
Hydrochloric Acid is found in?
Potassium Hydroxide is found in?
Sodium Hydroxide is found in?
Answer:
Malic Acid is found in Apples.
Hydrochloric Acid is found in Our Stomach.
Potassium Hydroxide is found in Soaps and Bleaches.
Sodium Hydroxide is found in Household Cleaners.
Explanation:
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Answer:
Its wrong the question is wrong you should delete it
I need the math to it to show how I got to the answer, please help #2
The number of moles of the water produces by the 1.3 moles of O₂ is 1.00 mol of H₂O. The correct option is C.
The chemical equation is as :
2C₄H₁₀ + 13O₂ ----> 8CO₂ + 10H₂O
The moles of the O₂ = 1.3 moles H₂O
The molar mass of the O₂ = 32 g/mol
2 moles of the C₄H₁₀ produces the 10 moles of the water,
13 moles of O₂ produces the 10 moles of H₂O
The moles of the H₂O = (10/13) × 1.3
The moles of the H₂O = 1 mol
The number of moles of the water is 1 mol of the H₂O and the moles of the oxygen that is O₂ is the 1.3 moles.. Therefore, the correct option is C.
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A 0.17−kg baseball thrown at 100 mph has a momentum of 7.7 kg · m/s. If the uncertainty in measuring the mass is 1.0 × 10−7 of the mass, calculate the uncertainty in the baseball's position.
The uncertainty in the baseball's position is approximately 6.97 × 10⁻³⁶ m.
Using the uncertainty principle, ∆x∆p ≥ h/4π, we can solve for the uncertainty in position:
∆x ≥ h/4π∆p
First, we need to convert the velocity from mph to m/s:
100 mph = 44.7 m/s
Next, we need to convert the momentum from kg · m/s to kg · m/s²:
7.7 kg · m/s = 7.7 N · s
Now we can solve for the uncertainty in position:
∆x ≥ h/4π∆p = (6.626 × 10⁻³⁴ J · s)/(4π × 7.7 N · s)
= 6.97 × 10⁻³⁶ m
As a result, the uncertainty in baseball's location is around 6.97 × 10⁻³⁶ m. This value is incredibly small and practically impossible to measure, indicating that the uncertainty in measuring the mass has no significant effect on the uncertainty in position.
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Give the structures of the free‑radical intermediates in the peroxide‑initiated reaction of HBr
with the following alkene. Include all lone‑pair electrons and unpaired electrons. Hint: the radicals do not coexist in the same mechanistic step.
The peroxide addition would yield a product that is different from the antiperoxide addition
What is the structure?Markovnikov's rule states that when a protic acid HX is added to an alkene, the acid hydrogen (H) forms a bond with the carbon atom that has the greatest number of hydrogen atoms, while the halide (X) group forms a bond with the carbon atom that has the fewest hydrogen atoms.
This can be summed up with the phrases "the rich get richer" and "the poor get poorer" in terms of hydrogen. This fundamental principle of alkene chemistry aids in predicting the results of addition reactions.
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How does a possum in Florida adapt to the winter season
Answer:
Because their fur doesn't provide much insulation from the cold, opossums typically spend the winter in dens that are dry, sheltered and safe.
Explanation:
Answer:
It finds a den or nest that is open
Explanation:
If 0.225 mol of an ideal gas has a volume of 1923 mL and a pressure of 6.00 atm, what is its temperature in degrees Celsius?
Use one of the following values:
R = 0.0821 atm • L/mol • K
R = 8.31 kPa • L/mol • K
R = 62.4 torr • L/mol • K
The temperature (in °C) given that 0.225 mole of an ideal gas has a volume of 1923 mL and a pressure of 6.00 atm is 351.6 °C
How do i determine the temperature of the ideal gas?First, we shall list out the various parameters obtained from the question. This is shown below:
Number of mole of ideal gas (n) = 0.225 moleVolume of ideal gas (V) = 1923 mL = 1923 / 1000 = 1.923 LPressure (P) = 6 atmGas constant (R) = 0.0821 atm.L/mol KTemperature of ideal gas (T) =?The temperature of the ideal gas can be obtain as follow:
PV = nRT
6 × 1.923 = 0.225 × 0.0821 × T
11.538 = 0.0184725 × T
Divide both sides by 0.0184725
T = 11.538 / 0.0184725
T = 624.6 K
Subtract 273 to obtain answer in °C
T = 624.6 - 273 K
T = 351.6 °C
Thus, we can conclude that the temperature of the ideal gas is 351.6 °C
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Julian put a heater with a power of 30 W into a block of copper and recorded the temperature of the block every minute for ten minutes. His results are below. How much energy had been transferred after 2 minutes?
The amount of energy transferred after 2 minutes is 3600 Joules.
We can use the formula for thermal energy to calculate the amount of energy transferred after 2 minutes:
Q = P * t
where Q is the thermal energy transferred (in Joules), P is the power of the heater (in Watts), and t is the time (in seconds).
We can convert the power from Watts to Joules/second:
30 W = 30 J/s
We can also convert the time from minutes to seconds:
2 minutes = 2 * 60 seconds = 120 seconds
Now we can substitute these values into the formula:
Q = P * t
Q = 30 J/s * 120 s
Q = 3600 J
Therefore, the amount of energy transferred after 2 minutes is 3600 Joules.
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Answer:
Explanation:
3600 Joules.
Intermolecular force between NH3 molecule and HF molecule is:
A)Ion-dipole force
B)Hydrogen bond
C)Dispersion (London) force
D)Ionic bond
E)Dipole-dipole force
The intermolecular force between [tex]NH_{3}[/tex] (ammonia) and HF (hydrogen fluoride) molecules is hydrogen bonding.
[tex]NH_{3}[/tex] and HF molecules hydrogen bind. [tex]NH_{3}[/tex] and HF are polar molecules having a significant electronegativity difference between hydrogen and nitrogen and fluorine, respectively. Hydrogen bonding strengthens the dipole-dipole interaction between the molecules.
Hydrogen bonding occurs when a hydrogen atom is covalently bound to a strongly electronegative atom like N, O, or F and attracts an electronegative atom in a neighbouring molecule. NH3's hydrogen atom bonds with HF's fluorine.
No ions are present, although ion-dipole forces exist between ions and polar molecules. NH3 and HF are polar, hence dispersion (London) forces do not apply. NH3 and HF, neutral chemicals, do not connect through ionic bonding. Dipole-dipole forces between NH3 and HF are not the greatest intermolecular force.
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please provide explanation!! thank you in advance!!
In the given reaction, CO + H [tex]_2[/tex] O ⇌ CO[tex]_2[/tex] + H[tex]_2[/tex], the equilibrium concentration of CO[tex]_2[/tex] and H[tex]_2[/tex] is 0.0113M. The equilibrium concentration of CO and H [tex]_2[/tex] O is 0.0113M.
When the observable qualities, like colour, temperature, pressure, concentration, etc. do not vary, the process is said to be in equilibrium. As "balance" is the definition of the word "equilibrium," it follows which a chemical reaction reflects a balance among the substances and outcomes involved in the reaction. In the given reaction, CO + H [tex]_2[/tex] O ⇌ CO[tex]_2[/tex] + H[tex]_2[/tex], the equilibrium concentration of CO[tex]_2[/tex] and H[tex]_2[/tex] is 0.0113M. The equilibrium concentration of CO and H [tex]_2[/tex] O is 0.0113M.
Therefore, the correct option is option A.
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The energy required to dissociate the Cl2 molecule to Cl atoms is 239 kJ/mol Cl2. If the dissociation of a Cl2 molecule were accomplished by the absorption of a single photon whose energy was exactly the quantity required, what would be its wavelength (in meters)?
Explanation:
The energy of a single photon can be calculated using the equation E = hc/λ, where E is the energy of the photon, h is Planck's constant (6.626 x 10^-34 J.s), c is the speed of light (2.998 x 10^8 m/s), and λ is the wavelength of the photon.
To dissociate one mole of Cl2 molecules, we need 239 kJ of energy. This corresponds to 239,000 J/mol of Cl2.
Now we can use the relationship between energy and the number of photons absorbed: E = Nhf, where N is the number of photons absorbed, h is Planck's constant, and f is the frequency of the absorbed photons.
We can relate the frequency of the absorbed photon to its wavelength using c = λf. Solving for f gives f = c/λ.
Combining these equations, we get E = Nh(c/λ), or N = E/(hc/λ). Substituting the value of E for the energy required to dissociate one mole of Cl2, we get:
N = (239,000 J/mol) / [(6.626 x 10^-34 J.s) x (2.998 x 10^8 m/s) / λ]
Solving for λ, we get:
λ = hc / (239,000 J/mol) = (6.626 x 10^-34 J.s x 2.998 x 10^8 m/s) / 239,000 J/mol
λ = 8.44 x 10^-7 m
Therefore, the wavelength of the photon required to dissociate one Cl2 molecule is approximately 8.44 x 10^-7 meters (or 844 nanometers).
FC1O₂(g) → FC10(g) + O(g)
The first-order decomposition of FC1O₂ (g) is represented by the equation above. At a certain temperature, the partial pressure of FC1O2(g) in a sealed vessel falls from 0.080 atm to 0.010 atm over 48
minutes.
What is the half-life of the decomposition reaction?
The half-life of a first-order reaction is given by the following equation:
t(1/2) = ln(2)/k
where t(1/2) is the half-life and k is the rate constant.
From the given information, we know that the partial pressure of FC1O2(g) falls from 0.080 atm to 0.010 atm over 48 minutes. We can use this information to calculate the rate constant as follows:
ln([FC1O2]t/[FC1O2]0) = -kt
where [FC1O2]t is the concentration (in atm) at time t, [FC1O2]0 is the initial concentration (in atm), and k is the rate constant.
Substituting the given values, we get:
ln(0.010/0.080) = -k(48)
Solving for k, we get:
k = 0.1225 min^-1
Now, we can use the equation for the half-life to calculate the answer:
t(1/2) = ln(2)/k
t(1/2) = ln(2)/0.1225
t(1/2) = 5.66 min (rounded to two significant figures)
Therefore, the half-life of the decomposition reaction is 5.66 minutes.
Elements that easily give up 1-3 electrons are called *
metals
Ononmetals
O noble
Ometalloids
noble gases
Answer:
metalloids
Explanation:
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Balance the equation
The balanced reaction equations are;
Na3PO4 + 3HCl → 3NaCl + H3PO4
2Al + 6HCl ----> 2AlCl3 + 3H2
2 FeC2O4 + 2 CO2---> Fe2(C2O4)3
TiCl4 + H2O → Ti(OH)4 + 4HCl
B2Br6 + 6HNO3 → 2B(NO3)3 + 6HBr
How do you balance the reaction equation?A chemical reaction equation must have an equal number of atoms for each element on both sides in order to be balanced.
Determine the total number of atoms in the reactants and products for each element. To balance the equation, pick a coefficient. This would be placed at the beginning of the chemical formula.
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if two substance are at the same temperature, their enthalpy
Answer:
cannot be measure
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In which of the following, are all the elements non-metals?
A. Na, Mg, O, N
B. C, Si, Ge, As
C. Fe, Ni, Cr, O
D. He, Ne, Ar, Kr
E. Ca, Ba, Sr, S
Answer:
The answer is D
Explanation:
Non metals are:
Hydrogen (H)
Sulphur (S)
Phosphorus (P)
Carbon (C)
Fluorine (F)
Oxygen (O)
Nitrogen (N)
Chlorine (Cl)
Bromine (Br)
Helium (He)
Argon (Ar)
Iodine (I)
Neon (Ne)
Krypton (Kr)
Radon (Rn)
Selenium (Se)
Xenon (Xe)
which month do blackberries grow?
Blackberries start to grow in the months of late may and early june.
Seasonal fruits are those which grow only in particular time or season of the year. This is the reason why they can be produced fresh . There is no need of chemicals for their survival and appearance during their season. Also, it can be hand-picked when it is fully ripened, moreover it contains a rich taste and flavour. Blackberries that are containerized and hybrid berries can be planted at any time of the year. But, they best settle in between the late autumn and late spring. During the dormant season i.e from late autumn to spring bare-root plants are only available for immediate planting.
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Double replacement reactions
Double replacement reactions refer to two ionic substances capable to exchange anions and or cations, ie. particles with different charges.
What is the meaning of Double replacement chemical reactions?The meaning of Double replacement chemical reactions is based on the fact that these types of reactions are required to change positive or negative charges between chemical materials.
Therefore, with this data, we can see that the meaning of Double replacement chemical reactions is based on the exchange of cations and or anions in the chemical substances that react during such processes.
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Which part of the electromagnetic spectrum is nearest to X-rays?
Answer:
UV or Gamma Rays
Explanation:
X-rays: 10^-10
UV: 10^-8
Gamma Rays: 10^-12
Combustion engines became common in the mid-1800s when people began to use them to power ships, trains, and machinery in factories. Combustion engines add carbon dioxide to the air, and as a result, carbon dioxide in the atmosphere increased quickly. How did this change the total amount of energy in the Earth system, and how did this change happen? How did this affect global average temperature?
The increased carbon dioxide levels from combustion engines caused a change in the Earth's energy balance. The additional carbon dioxide in the atmosphere allowed less radiation to escape into space, leading to a net increase in energy retained by the Earth.
This increase in energy is known as the enhanced greenhouse effect, which caused the Earth's average temperature to rise. This phenomenon is known as global warming. The rise in temperature has had numerous impacts on the Earth's climate, including more frequent heatwaves, melting ice caps, rising sea levels, and changes in precipitation patterns. The consequences of global warming are extensive and pose a significant threat to human societies and natural ecosystems, making it crucial to reduce greenhouse gas emissions.
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3.
(08.04 LC)
Which of the following is a base? (3 points)
AgO
Ca(OH)2
HF
NaCl
The compound that is a base from the given list is Ca(OH)2. Option 2.
What is a base?
A base is a chemical substance that produces hydroxyl ions as the only negative ion in aqueous solutions.
Ca(OH)2 is calcium hydroxide, which is a chemical compound consisting of one calcium ion (Ca2+) and two hydroxide ions (OH-).
It is classified as a base because, when it dissolves in water, it produces hydroxide ions that can accept protons (H+) from acids in a process known as a neutralization reaction.
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What does voltage describe?
The Voltage is the pressure from the electrical circuit of the power source that passes the current.
The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.
The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.
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In 24 g of carbon ,how many number of carbon atoms.
There are 1.204 × 10²⁴ atoms in 24 grams of carbon.
How to calculate number of atoms?The number of atoms present in a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number as follows;
no of atoms = no of moles × 6.02 × 10²³
According to this question, there are 24 grams of carbon atom. The number of moles in this carbon is as follows:
no of moles = 24g ÷ 12g/mol = 2mol
no of atoms = 2 × 6.02 × 10²³
no of atoms = 1.204 × 10²⁴ atoms.
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A covalent compound is broken down into its individual elements. The amount of energy required to break the bonds is 1254 kJ, and the energy produced as a result of breaking the bonds is 1001 kJ. What type of reaction has most likely occurred?
a. combustible reaction
b. spontaneous reaction
c. endothermic reaction
d. exothermic reaction
Answer: c. endothermic reaction.
Explanation: In an endothermic reaction, energy is absorbed or required to break the bonds in the reactants. This means that more energy is required to break the bonds than is released by the formation of new bonds in the products, resulting in a net absorption of energy. In this case, the amount of energy required to break the bonds (1254 kJ) is higher than the energy produced by breaking the bonds (1001 kJ), indicating that the reaction requires an input of energy and is therefore endothermic.
Answer:
c. endothermic reaction
Explanation:
The given information states that the amount of energy required to break the bonds of the covalent compound is 1254 kJ, and the energy produced as a result of breaking the bonds is 1001 kJ.
In an endothermic reaction, the energy required to break the bonds is greater than the energy released or produced. This means that more energy is absorbed from the surroundings than is released during the reaction. In this case, since the energy required to break the bonds (1254 kJ) is greater than the energy produced (1001 kJ), it indicates that the reaction requires an input of energy from the surroundings, making it an endothermic reaction.
Option c, "endothermic reaction," is the correct answer based on the given information.
20. At its closest approach, Mars is 56 million km from Earth. How long would a radio message from a space probe on Mars take to reach Earth when the planets are at this distance?
Answer:
The time it takes for a radio message to travel from a space probe on Mars to Earth when the planets are at a distance of 56 million km can be calculated using the speed of light which is about 299,792,458 meters per second.
To convert the distance from kilometers to meters, we multiply 56 million km by 1000 to get 56 x 10^6 km = 5.6 x 10^10 m.
The time it takes for a radio signal to travel from Mars to Earth is:
time = distance/speed
time = 5.6 x 10^10 m / 299,792,458 m/s
time = 187 seconds
Therefore, a radio message from a space probe on Mars would take about 187 seconds, or just over 3 minutes, to reach Earth when the planets are at a distance of 56 million km.
A scientist is designing a space probe that will be sent to Jupiter to analyze the atmosphere there. Before building a full-scale version of the probe, the scientist is going to build a model of it to test whether the probe can withstand the extreme environmental conditions of Jupiter's atmosphere. These extreme conditions include cold temperatures, strong gravitational forces, and high winds. Urgent!!!!!
Which of the following would most likely be the same about the scientist's model probe and the eventual full-scale version of the probe?
A.
They would be the same size.
B.
They would be made of the same material.
C.
They would be able to hold the same amount of fuel.
What would be the same about the scientist's model probe and the eventual full-scale version of the probe is that; . They would be the same size. Option A
What is the conditions?It is likely that the scientist's model probe would be built to replicate the size and proportions of the full-scale version because this would be vital in determining if the full-scale probe could endure the punishing conditions of Jupiter's atmosphere. The dimensions of the model probe and the real probe would therefore likely be the same.
However, it's likely that the model probe's parts weren't exactly the same as those in the actual probe.
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Which of the following aqueous solutions is (are) considered basic?
1. [OH-]= 2.57 × 10-4 M
II. pH= 8.43
III. [H3O+]= 4.27 x 10-5 M
O III only
O II and III only
O I and III only
O I and II only
O All of these
The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. Here among the given options, all the aqueous solutions are considered as basic. The correct option is E.
The pH of a solution is defined as the negative logarithm to the base 10 of the activity of hydrogen ions. At 298 K, for pure water or in a neutral solution the pH is found to be 7.
For an acidic solution, the concentration of H₃O⁺ is greater than 10⁻⁷ M and the pH will be less than 7. For a basic solution, the concentration of H₃O⁺ is less than 10⁻⁷ M and hence the pH will be greater than 7.
Thus the correct option is E.
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The concentration of an aqueous solution of NaCl is 15% by mass. How much NaCl is in a 500 gram sample of the solution?
a. 425 grams
b. 750 grams
c. 75 grams
d. 330 grams
Answer:
To solve this problem, we can use the definition of percent concentration by mass:
percent concentration = (mass of solute ÷ mass of solution) x 100%
We know that the percent concentration of NaCl in the solution is 15% by mass, and we have a 500 gram sample of the solution. Let's assume that the mass of NaCl in the sample is x grams.
Using the percent concentration formula, we can write:
15% = (x ÷ 500) x 100%
Simplifying this equation, we get:
x = (15 ÷ 100) x 500 = 75 grams
Therefore, there are 75 grams of NaCl in a 500 gram sample of the solution.
The correct answer is c. 75 grams.
1. Explain how you would determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following information. You do not need to calculate an answer. Respond to the prompt with a minimum response length of 50 words.
we can determine the enthalpy of reaction for the hypothetical reaction A2X4(l) + X2(g) → 2AX3(g) using the following steps:
write the balanced chemical equation for the reactionwe obtain the standard enthalpies of formation for each compoundwe apply Hess's law calculate the enthalpy of reactionwe then add up the changes to get the total enthalpy change for the reaction State Hess law?Hess's Law of Constant Heat Summation 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.
The law is Hess's Law of Constant Heat Summation is described as a manifestation that enthalpy is a state function.
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