Answer:
0.075 moles
Explanation:
Looking at the balanced equation, 4 moles of Fe(s) react with 3 moles of [tex]O_{2}[/tex] to produce 2 moles of [tex]Fe_{2}O_{3}[/tex] (s). In other words, for every 4 moles of Fe(s) used, there are 2 moles of product. The mole ratio is therefore 4:2, or 2:1. In other words, you divide the moles of Fe by two to find the moles of product.
There are 0.15 moles of Fe, so the moles of product should be half of this according to the molar ratio.
0.15 / 2 = 0.075Your answer is 0.075 moles.
Hope this helps!
The colligative molality of seawater is approximately 1.10 m. Calculate the vapor pressure of sea water at 20°C. The vapor pressure of pure water at 20°C is 17.54 Torr?
From the given information using the colligative property, the vapor pressure of seawater at 20°C is approximately 17.07 Torr.
To calculate the vapor pressure of seawater at 20°C, we can use the following equation:
ΔP = P°(solvent) - P(solvent)
where ΔP is the change in vapor pressure, P°(solvent) is the vapor pressure of the pure solvent (water), and P(solvent) is the vapor pressure of the solvent in the solution (seawater). We can solve for P(solvent) to get the vapor pressure of seawater.
The vapor pressure of pure water at 20°C is given as 17.54 Torr. We can assume that the seawater solution is dilute and therefore can use the following approximation:
ΔP ≈ -Km
where K is the cryoscopic constant (for water, K = 1.86 °C/m) and m is the molality of the solution.
Substituting the given values, we get:
ΔP = -Km = -1.86 °C/m × 1.10 m = -2.046 °C
To convert this temperature change to a vapor pressure change, we can use the Clausius-Clapeyron equation:
ln(P°(solvent)/P(solvent)) = ΔHvap/R × (1/T(solvent) - 1/T°)
where ΔHvap is the enthalpy of vaporization of the solvent, R is the gas constant, T(solvent) is the temperature of the solvent in kelvin (20 + 273 = 293 K), and T° is the normal boiling point of the solvent (100°C or 373 K for water).
We can solve for P(solvent) to get:
P(solvent) = P°(solvent) × exp(-ΔHvap/R × (1/T(solvent) - 1/T°))
The enthalpy of vaporization of water is approximately 40.7 kJ/mol, and R is 0.08206 L·atm/mol·K.
Substituting the values, we get:
P(solvent) = 17.54 Torr × exp(-40700 J/mol / (0.08206 L·atm/mol·K × 293 K) × (1/293 K - 1/373 K)) = 17.07 Torr
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in any organic redox reaction, you can recognize the reduced and oxidized organic molecules by tracking the charges between products and reactants. reduction corresponds to an increased charge . oxidation corresponds to
Reduction corresponds to an increased charge, while oxidation corresponds to a decreased charge.
Reduction involves a decrease in oxidation number and an increase in charge. On the contrary, oxidation of a compound or an element in a reaction involves increase in oxidation number and a decrease in overall charge.
Reduction is a process in which hydrogen ions are added to the reactant, while oxidation experiences a loss of hydrogen ions. Another aspect of redox reactions involves addition of electrons in reduction, while loss of electrons in oxidation. Redox reactions are the chemical reactions in which there is a chemical change in the substrate or the reactants. Where reduction stores energy, oxidation releases it.
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the concentration of carbon dioxide in surface water is low, whereas the concentration of oxygen is high because of the .
Because of the process of photosynthesis, surface water normally has a low percentage of carbon dioxide (CO2) and a high concentration of oxygen (O2).
In order to create organic matter and release oxygen as a byproduct, plants, algae, and some bacteria engage in a process known as photosynthesis. In aquatic conditions, phytoplankton—a microscopic algae that floats close to the water's surface—performs the majority of the photosynthesis.
During photosynthesis, phytoplankton take in carbon dioxide from the water and utilise it to fuel a sequence of chemical reactions that result in the production of organic matter. The amount of carbon dioxide in the water therefore drops. At the same time, oxygen is released by phytoplankton as a byproduct, raising the oxygen content in the liquid. This explains why surface water often has a high oxygen content.
Other elements, such as gas exchange with the atmosphere, the breakdown of organic materials, and aquatic species' respiration, can also have an impact on the amount of carbon dioxide in surface water. The main mechanism, however, for the high concentration of oxygen and low concentration of carbon dioxide in surface water is photosynthesis.
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What is the normality of:
2.5 M gallium(III) hydroxide
6.0 M barium hydroxide
4.5 M sulfuric acid
0.54 M iron(II) hydroxide
Answer:
The term "normality" refers to the number of moles of a solute present in one liter of a solution, expressed as equivalents per liter (Eq/L). To calculate the normality of a solution, you need to know the molarity (moles of solute per liter of solution) and the equivalent weight of the solute. The equivalent weight of a solute is the atomic weight or molecular weight of the solute divided by the number of ions or molecules that can be formed from one molecule of the solute.
2.5 M gallium(III) hydroxide: Gallium(III) hydroxide is a basic compound and forms Ga(OH)3. One mole of Ga(OH)3 will yield three moles of hydroxide ions, so the equivalent weight of Ga(OH)3 is 1/3 of its molecular weight. Therefore, the normality of 2.5 M gallium(III) hydroxide solution is 2.5 x 3 = 7.5 N.
6.0 M barium hydroxide: Barium hydroxide is a basic compound and forms Ba(OH)2. One mole of Ba(OH)2 will yield two moles of hydroxide ions, so the equivalent weight of Ba(OH)2 is 1/2 of its molecular weight. Therefore, the normality of 6.0 M barium hydroxide solution is 6.0 x 2 = 12 N.
4.5 M sulfuric acid: Sulfuric acid is an acidic compound and forms H2SO4. One mole of H2SO4 will yield two moles of hydrogen ions, so the equivalent weight of H2SO4 is 1/2 of its molecular weight. Therefore, the normality of 4.5 M sulfuric acid solution is 4.5 x 2 = 9 N.
0.54 M iron(II) hydroxide: Iron(II) hydroxide is a basic compound and forms Fe(OH)2. One mole of Fe(OH)2 will yield two moles of hydroxide ions, so the equivalent weight of Fe(OH)2 is 1/2 of its molecular weight. Therefore, the normality of 0.54 M iron(II) hydroxide solution is 0.54 x 2 = 1.08 N.
Organic molecules that are universally used as an immediate source of energy are the:_________
When ATP is broken down, it releases energy in the form of a phosphate bond, which can be used to power metabolic processes.
What is metabolic ?Metabolism is the set of life-sustaining chemical reactions that occur in living organisms. These biochemical processes allow organisms to grow and reproduce, maintain their structures, and respond to their environment. Metabolism of energy within cells is known as cellular metabolism. Metabolism can be divided into two categories, catabolism and anabolism. Catabolism is the breakdown of molecules to obtain energy. Anabolism is the building up of molecules to create other molecules and store energy. Metabolic reactions involve the energy that is used to power the cell and the molecules that are used as building blocks for biosynthesis.
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Question 2(Multiple Choice Worth 3 points)
(01.02 LC)
What is the metric unit for length?
O Meters
O Miles
O Distance
O Inches
Answer: metric unit for length would be Meters (m)
which of the following related to phase changes of water is incorrectly matched? which of the following related to phase changes of water is incorrectly matched? deposition - energy released melting - energy absorbed condensation - energy released sublimation - energy absorbed evaporation - energy released
Determine the water phase transition that is not appropriately matched: Melting - energy absorbed (should be energy released).
Melting - energy absorbed is the wrong answer in the options that are connected to the phases of water. In order to overcome the intermolecular interactions and transform the solid state of the material into a liquid, energy must be absorbed by the substance during melting. In contrast, energy is released when water vapour transforms into liquid in condensation as opposed to deposition, when it transforms into ice first. When solid ice transforms into water vapour in the process of sublimation, energy is absorbed, and as liquid water transforms into water vapour in the process of evaporation, energy is released.
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write the ground-state electron configuration for calcium, ca.
the electron configuration for calcium can be written as:
1s2 2s2 2p6 3s2 3p6 4s2
The atomic number of calcium is 20, indicating that it has 20 electrons. The ground-state electron configuration for calcium can be written using the following rules: 1s2 2s2 2p6 3s2 3p6 4s2
The first number before each sub-shell indicates the principal quantum number (n), while the letter indicates the type of sub-shell (s, p, d, or f) and the superscript indicates the number of electrons in that sub-shell. Therefore, the electron configuration for calcium can be written as:
1s2 2s2 2p6 3s2 3p6 4s2. Electronic configuration refers to the distribution of electrons in the orbitals of an atom or ion. It describes the arrangement of electrons in the electron shells or energy levels and subshells or orbitals of an atom or ion.
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a student was asked to determine the concentration of ammonia, a volatile substance, in a commercially available cloudy ammonia solution used for cleaning. first, the student pipetted 25.00ml of the cloudy ammonia solution into a 250.0 ml conical flask. 50.00 ml of 0.100 m hcl(aq) was immediately added to the conical flask which reacted with the ammonia in solution. the excess (unreacted) hcl was then titrated with 0.050 m na2co3(aq). 21.50ml of na2co3(aq) was required. calculate the concentration of the ammonia in the cloudy ammonia solution.
Based on the provided data, the concentration of ammonia in the cloudy ammonia solution is 0.200 M.
Calculation of Concentration of Ammonia in a Cloudy Ammonia SolutionThe balanced chemical equation for the reaction between ammonia and hydrochloric acid is:
NH3(aq) + HCl(aq) → NH4Cl(aq)
From the equation, we see that one mole of ammonia reacts with one mole of hydrochloric acid to produce one mole of ammonium chloride.
To determine the concentration of ammonia in the cloudy ammonia solution, we need to find out how many moles of hydrochloric acid were used to react with the ammonia.
The number of moles of HCl used is:
moles of HCl = concentration of HCl × volume of HCl used
moles of HCl = 0.100 mol/L × 0.0500 L
moles of HCl = 0.00500 mol
Since the reaction is 1:1 between HCl and NH3, the number of moles of NH3 in the cloudy ammonia solution is also 0.00500 mol.
The volume of the cloudy ammonia solution used is 25.00 mL, which is equivalent to 0.02500 L.
The concentration of ammonia in the cloudy ammonia solution is:
concentration of NH3 = moles of NH3 / volume of cloudy ammonia solution
concentration of NH3 = 0.00500 mol / 0.02500 L
concentration of NH3 = 0.200 mol/L or 0.200 M
Therefore, the concentration of ammonia in the cloudy ammonia solution is 0.200 M.
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The strength of an ionic bond comes principally from:a) The converting of atoms into compounds.b) The movement of electrons from cations to anions.c) The mutual attraction of opposite electrical charges.d) The sharing of electrons.
The strength of ionic bond is principally from the mutual attraction of opposite charges. So the correct option here is C.
Ionic compounds are formed by the interaction of electropositive metals and electronegative non metals. The difference in electronegativities are so high that the electrons are completely transferred between atoms to form the bond.
The metals, having 1 or 2 electrons in the outer shell gives up the electrons to complete octet electron configuration and becomes positively charged ions. The non metals need one or two electrons to complete octet, so they take the electrons given by the metals, and thus become negatively charged ions.
So the attraction between the positive and negative charged ions is the reason the compound exists. So the mutual attraction of opposite charge is the strength of ionic bond.
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What piece of equipment is used for measuring exact volumes of liquid?
It is typical to measure liquid volume using both a graduated cylinder and a buret. As the name implies, a graded cylinder is a cylindrical glass or plastic tube that is sealed at one end and has a calibrated scale inscribed on the outside.
A measuring cylinder, often referred to as a graded cylinder, a measuring cylinder, or a mixing cylinder, is a piece of lab apparatus used to gauge the quantity of fluids, chemicals, or solutions used during a typical lab session. Graduated cylinders are more precise and accurate than traditional laboratory flasks and beakers. The scale on a 50-mL buret is in increments of 0.1 mL. A buret's liquid level is measured and recorded to the nearest 0.01 mL in order to prevent any inaccuracies. The volume of the liquid can be calculated using a measuring flask, pipette, and measuring cylinder.
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The ratio is very close to 1 C to 2 H.
What is the empirical formula?
A. C₂H
B. CH₂
C. C₂H₂
The ratio is very close to 1 C to 2 H. Then the empirical formula is CH₂. Therefore, option B is correct.
What is an empirical formula ?An Empirical formula is the chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the actual numbers or arrangement of atoms. This would be the lowest whole number ratio of the elements in the compound.
To find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles.
In CH₂ there are one carbon and two hydrogen atoms are present. Hence, CH₂ is an empirical formula.
Thus, option B is correct.
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Look at the diagram shown below. Could this equipment be used to find out how much energy a fuel
gives out when it burns?
no
yes
Thermometer
Container
B
Lid
Mixed chemicals
Answer: Yes
Explanation:
Answer:
YESS
Explanation:
This equipment could be used to find out how much energy a fuel gives out when it burns. By measuring the temperature change in the container, the energy released by the combustion reaction can be calculated. The thermometer measures the temperature change and the container is used to hold the mixed chemicals (fuel and oxidizer). The lid is used to prevent the loss of heat and to create a closed system for the reaction to take place.
ALLEN
Calculate the pH of a solution prepared by mixing 15.0 mL of 0.50 M NaOH and 30.0 mL of 0.50 M benzoic acid solution. (Benzoic acid is monoprotic; its dissociation constant is 6.5 x 10-5.)
what do we call electrons that are in the outermost energy level of an atom?
Electrons that are in the outermost energy level of an atom are referred to as "valence electrons."
Valence electrons are the electrons that are involved in chemical reactions and bonding, and they play a crucial role in determining the chemical properties of an element.
In general, the number of valence electrons in an atom is related to the position of the element in the periodic table. Elements in the same group (vertical column) have the same number of valence electrons, and this number increases as you move from left to right across a period (horizontal row). The arrangement of valence electrons is important for understanding chemical reactivity, because it determines the way in which atoms bond with each other to form molecules.
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can you assume that any coloration you see in an animal is cryptic? why or why not
No, it is not safe to assume that any coloration seen in an animal is cryptic. While many animals have evolved to have coloration that helps them blend into their environment and avoid predators or attract mates, there are also many animals that have bright and conspicuous coloration for other reasons, such as warning predators of their toxicity or advertising their fitness to potential mates. Therefore, it is important to consider the specific context and behavior of the animal before making assumptions about the purpose of its coloration.
What is cryptic colouration?Cryptic coloration refers to an animal's ability to blend in with its environment, making it difficult for predators or prey to spot them. This can help the animal avoid being detected, making it easier to hunt or avoid being hunted. Cryptic coloration can take many forms, including camouflage, mimicry, or disruptive coloration, and is a common adaptation seen in many species of animals, including insects, birds, reptiles, and mammals.
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the by-products of the refining of petroleum are separated based on which characteristic? responses boiling point boiling point concentration concentration melting point , melting point composition
The by-products of the refining of petroleum are separated based on their boiling points and composition.
Petroleum refining involves the process of heating crude oil in a distillation column to separate it into its various components, which have different boiling points. The crude oil is heated and the vaporized oil rises through the column, where it condenses at different heights according to its boiling point.
Additionally, the composition of the crude oil also plays a role in the separation process. Crude oil is made up of a complex mixture of hydrocarbons, which are molecules made up of carbon and hydrogen atoms. Different types of hydrocarbons have different boiling points, so the composition of the crude oil determines the boiling points of the different components that are separated during refining.
In summary, the by-products of petroleum refining are separated based on their boiling points, which are determined by their composition of hydrocarbons.
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in order to react safely and appropriately during a vehicle failure, the motorist needs to understand the following: a) what has happened? b) what are the correct procedures to follow? c) how are these procedures immediately and successfully implemented? d) all of the above
The answer is that in order to react safely and appropriately during a vehicle failure the motorist need to understand is stated in option d, that says, all of the above.
During a vehicle failure the motorist should react safely and appropriately in order to deal with the situation in a suitable and safe manner.
The first important thing is that the motorist heads to understand what has happened and what are the next correct procedures that he should follow and finally the motorist should also understand that how these procedures should be implemented immediately and successful it too.
As we can see that all of these three things are very important in order to react safely, we can conclude that the answer to your question is option d. all of the above.
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Which mass of Carbon id produced?
Answer:
(c) 4.4g
Explanation:
Given:
mass of calcium carbonate (mCaCO3) = 10g
MrCaCO3 = 100
To find: mCO2
Solution:
CaCO3 + 2HCl → CaCl 2 + H2O + CO2
Now,
MrCaCO3 = 40 + 12 + 16.3 = 100
Therefore,
Number of moles (n) = m/Mr
nCaCO3 = 10/100 = 0.1
The amount of moles is proportional to the coefficient of the reaction. Since both calcium carbonate (CaCO3) and carbon dioxide (CO2) have the same coefficient.
nCO2 = 0.1
MrCO2 = 12 + 16.2 = 44
mCO2 = 0.1 × 44 = 4.4g
How could you modify this simulation to demonstrate that different isotopes have different half lives
The simulation can be modified to demonstrate different isotopes have different half lives by [tex]-\frac{d[A]}{dt} = k[A]^n[/tex]
Partial life is a partial life because it's defined this way. stay lower than that, and the decay will take out lower than partial tittles; stay more, and it'll take out further than half.
The partial life is used as a accessible measure because a sample of isotopes decays exponentially with time. Each snippet has the same chance of decaying in a fixed time interval and this leads to an exponential decay. All tittles bear the same way and continue to decay until all have been changed, whether this takes glories or seconds.
You can just as fluently define a" one- third" life, a" quarter- life". Radioactive isotopes decay exponentially; half- life is just accessible measure that captures the kinetics of the decay.
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if a reaction starts with 0.480 mol mg how many moles of silver are produced?
From the balanced chemical equation:
1 mol Mg reacts with 2 mol Ag Therefore, the number of moles of Ag produced can be calculated as:
[tex]0. 80 mol Mg × (2 mol Ag / 1 mol Mg) = 0.960 mol Ag[/tex]
Therefore , if the reaction starts with 0.80 mol with Mg and continues to the end, 0.960 mol Ag is formed.
In chemistry, moles are a unit of measurement that are used to describe how much a material is present. Avogadro's number, or roughly 6.022 x 1023 particles, is referred to as the quantity of entities in a substance that is equivalent to that amount. For expressing vast amounts of compounds and doing computations in chemical reactions, moles are a useful unit. Molecules can be employed in a chemical reaction to calculate the quantity of reactants and products and to balance the equation. Additionally, moles are employed in stoichiometry, the area of chemistry concerned with the numerical features of chemical reactions. The mole is a crucial notion in chemical calculations because it gives a mechanism to translate between a substance's mass and the number of particles it contains.
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If a reaction starts with 0.480 mol Mg how many moles of silver are produced
Mg + 2AgNO3 --> Mg(NO3) + 2Ag
nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. the ratio of the number of neutrons to the number of protons in a nucleus (n/z) correlates with its stability. calculate the n/z ratio for 147sm.
Nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. the ratio of the number of neutrons to the number of protons in a nucleus (n/z) correlates with its stability. 1.41 is the n/z ratio for 147Sm.
What is radioactive decay?The process by which an unstable atomic nucleus loses energy through radiation is known as radioactive decay (also referred as nuclear decay, radioactivity, radioactive disintegration, and nuclear disintegration). A radioactive substance is one that contains unstable nuclei.
Nuclei differ in their stability, and some are so unstable that they undergo radioactive decay. the ratio of the number of neutrons to the number of protons in a nucleus (n/z) correlates with its stability.
n/z ratio = 88/62= 1.41
Therefore, 1.41 is the n/z ratio for 147Sm.
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Why is it advised to add concentrated acid to water and not water to the acid?
Acid first forms a highly concentrated solution when water is added to it, and this solution may vigorously boil, spitting concentrated acid. Acid and water combine to form an incredibly dilute solution that cannot be vaporized and spattered because of the insufficient heat output.
An exothermic reaction occurs when water is introduced to a concentrated acid; the heat that is produced may cause the liquid to splash out and cause burns. In contrast, the mixture won't splash out when acid is gradually added to water while stirring continuously since less heat is produced. Concentrated acid is splashed out of the container when water is added to the solution, which causes the solution to violently boil. Here, hydration results in an exothermic process that releases a significant quantity of energy. As a result, concentrated acid is introduced to water instead of the other way around.
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What is the function of this monosaccharide molecule?
please help
Answer: produce and store energy.
Explanation:
Given 3. 82g of (NH4)2O find how many atoms of (NH4)2O
Answer: 4.41*10^23 atoms
Explanation:
3.82*(6.02*10^23)/52.10= 4.41*10^23 atoms
N*2=14.01*2=28.02
H*8= 1.01*8= 8.08
O*1=16.00*1=16.00
Add them together to get 52.10 g
If 20cm^3 of potassium chloride was titrated with 60cm^3of 0.105M silver nitrate solution,calculate the molarity of potassium chloride solution
According to molar concentration, the molarity of potassium chloride solution is 0.315 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In case of 2 solutions, it is calculated as, M₁V₁=M₂V₂ which on substitution gives M₁=0.105×60/20=0.315 M.
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The equilibrium SO₂Cl₂ (g) --> SO₂ (g) + Cl₂ (g) is attained at 25 °C in a closed container.
When the concentration of Cl₂ is increased keeping the temperature constant, which of the following statements are correct?
a) Concentration of SO₂ is increased
b) Concentration of SO₂Cl2 is decreased
c) Concentration of SO₂ is decreased
d) None of the above
Transcribed image text: Select the keyword or phrase that will best complete each sentence. Select the keyword or phrase that will best complete each sentence. A tetrahedral carbon is____hybridized while a linear carbon is_____hybridized. Two different compounds that have the same molecular formula are known as_______. Pi (pi) bonds are generally____than sigma (sigma) bonds. Hybridization is the combination of two or more______orbitals to form the same number of____orbitals, each having the same shape and energy. A_____bond is formed by side-by-side overlap of two p orbitals. The____is a measure of an atom's attraction for electrons in a bond and indicates how much a particular atom ''wants" electrons. Two Lewis structures that have the same atomic placement and a structure but a different arrangement of pi electrons are called_____. All single bonds are_____bonds.
The answer for the blanks are: sp3, sp, isomers, weaker, atomic, hybrid, pi, electronegativity, resonance structures, sigma (in the sequence of the blanks)
A tetrahedral carbon is sp3 hybridized while a linear carbon is sp hybridized. Two different compounds that have the same molecular formula are known as isomers. Pi (pi) bonds are generally weaker than sigma (sigma) bonds. Hybridization is the combination of two or more atomic orbitals to form the same number of hybrid orbitals, each having the same shape and energy. A pi bond is formed by side-by-side overlap of two p orbitals. The electronegativity is a measure of an atom's attraction for electrons in a bond and indicates how much a particular atom ''wants" electrons. Two Lewis structures that have the same atomic placement and a structure but a different arrangement of pi electrons are called resonance structures. All single bonds are sigma bonds.
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What is the total pressure?
What is the partial pressure of Cl2?
The partial pressure of Cl2 is calculated by taking the chemical equation that is mentioned below. In an equilibrium mixture at 500 K, the partial pressure of PCl5 is 0.860 atm and that of PCl3 is 0.350 atm.
The partial pressure of Cl2 at equilibrium is. Q. 'a' mol of PCl5 undergoes thermal dissociation as-
PCl5⇌PCl3+Cl2;
the mole fraction PCl3 at equilibrium is 0.25 and the total pressure is 2 atm. The partial pressure can be calculated as follows: P(gas 1) = x(gas 1) * P(Total); where x(gas 1) = no of moles(gas 1)/ no of moles(total). As you can see the above formulae does not require the individual volumes of the gases or the total volume.
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what is the total enthalpy change (in kj/mol) for the dissociation of a mole of hydrogen gas at stp?
the total enthalpy change for the dissociation of a mole of hydrogen gas at STP is 872 kJ/mol.
The dissociation of hydrogen gas (H2) into individual hydrogen atoms (2H) can be represented by the following chemical equation:
H2(g) → 2H(g)
The standard enthalpy change of this reaction is given by the bond dissociation energy of the H-H bond in H2, which is 436 kJ/mol. Since two H-H bonds are broken in the dissociation of one mole of H2, the total enthalpy change for the reaction is:
2 × 436 kJ/mol = 872 kJ/mol
Therefore, the total enthalpy change for the dissociation of a mole of hydrogen gas at STP is 872 kJ/mol.
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