a chemist burns 175g of solid magnesium in excess 02
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Final molarity of NO3- in solution = 0.0193864/0.200= 0.0969 M OR 0.097

Barium nitrate=Barium nitrate is the inorganic compound with the chemical formula Ba(NO₃)₂. It, like most barium salts, is colorless, toxic, and water-soluble. It burns with a green flame and is an oxidizer.

Ba(NO3)2(aq) + Na2CrO4(aq)->2NaNO3(aq) + BaCrO4(s)

Moles of Ba(NO3)2 = mass/molar mass = 1.57/161.97 = 0.0096932

Moles of Na2CrO4 = molarity volume in liters = (44*10^-3)*(200/1000) = 0.0088

From reaction,

1 mole Na2CrO4 requires 1 mole Ba(NO3)2

So, 0.0088 moles will require = 1*0.0088 0.0088 moles of Ba(NO3)2

So, Ba(NO3)2 is excess reagent and Na2CrO4 is limiting reagent.

1 mole Na2CrO4 produces 2 moles NaNO3

So, 0.0088 mole Na2CrO4 will produce = 2*0.0088 0.0176 moles

So, moles of NO3- from NaNO3 (n2) = 0.0176+1 = 0.0176

Total moles of NO3-=n1+n2 = 0.0017864 +0.0176 0.0193864 moles

Volume of solution

= 200 ml = 0.200 liters

Final molarity of NO3- in solution = 0.0193864/0.200= 0.0969 M OR 0.097

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a) Partial pressures is Po2 = 8.13 atm,Pch4=3.94atm,Phe = 5.6 atm,B) Total pressure= 17.73 atm, C) mole fraction are Хо2 =0.46, xch4=0.22, xhe=0.32.

mole fraction are Хo2 =3.3/3.3+ 16 + 2.3,Хо2 =0.46, xch4=0.22, xhe=0.32. Xo2 = no2/no2 + nch4 + nhe, total pressure = 8.13+3.94+5.6=17.73 atm. The pressure applied by a solitary gas in a combination is did refer to as its partial pressure. Presuming we get a combination of ideal gas law, we could use ideal gas equation to resolve issues involving gases inside a mixture. Partial Pressure can be defined as if a canning jar filled with far more than one gas, evey gas enforces pressure. The pressure of any gas enclosed within in the container is regarded to as its partial pressure. The number of molecules of a special component in a mix divided by the total amount of moles in the given medium is symbolised by the mole fraction. It's a means of expressing a solution's concentration.

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The H2O bond is the most polar because the difference in electronegativity between H and O is at its highest.

Since each of the molecules in the set contains hydrogen and another element, the bond that fluorine makes with the hydrogen molecule will be the most polar of the group since fluorine is the most electronegative element in the periodic table. Check each bond's atoms' electronegativity properties. The most polar link will match the difference in electronegativity that is highest. The response is (b) N–H. The short answer is that because nitrogen is one of the most electronegative elements in the periodic table, its bond with hydrogen will be the most polar of all those mentioned.

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The product of the distillation is enriched in the lower boiling liquid, The vapor is a mixture of molecules from all the volatile liquids, The vapor is enriched in the lower boiling component.

Traditional distillation, often known as distillation, is the process of removing specific elements or compounds from a liquid mixture by selectively boiling and condensing them, typically inside a still. Dry distillation, which might involve chemical alterations like destructive distillation or cracking, is the heating of solid materials to produce gaseous products (which may condense into liquids or solids). In either case, the process takes advantage of variations in the relative volatility of the mixture's components. Distillation can produce an almost completely complete separation (resulting in nearly pure components), or it can be a partial separation that boosts the concentration of certain components. Distillation, a physical separation procedure rather than a chemical reaction, is a unit operation of virtually universal importance in industrial applications.

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True. Calcium ions (Ca2+), which are released by the SR, bind to troponin in the sarcoplasm. Then, troponin displaces tropomyosin from the actin myosin-binding sites.

Troponin levels that are extremely high indicate the onset of a heart attack. Within six hours after a heart attack, the majority of individuals experience elevated troponin levels. Mostly everyone who has experienced a cardiac arrest will still have elevated levels after 12 hours. After a heart attack, troponin levels may continue to rise for 1 to 2 weeks. For instance, the typical levels for troponin I is 0 to 0.04 ng/mL, whereas the normal range for rising cardiac troponin (hs-cTn) is less than 14 ng/L. Increases in troponin levels may result from other kinds of heart damage. One of these is sinus arrhythmia.

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A buffer solution is the  consists of a mixture of a weak acid and its conjugate base. it resists changes in pH upon addition of small amounts of acid or base.

The correct option from the given option is , the A buffer solution is the  consists of a mixture of a weak acid and its conjugate base. or the weak base and the conjugate acid. A buffer solution resist the the change in pH upon the addition of the small amount of the acid or base to them. the pH of buffer shows the little change when we add very small amount of the strong acid and the strong base.

The buffer solution has the ability to maintain the hydrogen ion concentration with only small amount of dilution  with acid or base.                                  

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Answer:

Explanation:

Lead nitrate can cause serious issues if it comes into contact with a person's eye. Lead nitrate is a toxic chemical that can cause irritation and damage to the eye if it comes into contact with the eye tissue. Symptoms of eye irritation or injury from lead nitrate may include redness, swelling, pain, and blurred vision. If left untreated, lead nitrate exposure to the eye can lead to serious eye damage, including corneal abrasions, conjunctivitis, and even vision loss.

If lead nitrate comes into contact with your eye, it is important to seek medical attention immediately. You should rinse your eye with plenty of water and seek medical attention as soon as possible. Your healthcare provider will be able to determine the extent of the injury and provide appropriate treatment. It is important to follow your healthcare provider's instructions carefully to prevent further injury to your eye.

Mendeleev's periodic table includes all the elements that were known at the time.

The rows of the table, were called periods and each period contained eight elements that increased in atomic mass from left to right.

The columns of the table, called groups, contained elements with similar properties.

The special this about this table was, the gaps for predicted elements were left.

In this question, we are given with four statements and are asked to determine, which of the following statement is not true regarding Dmitri Mendeleev's periodic table.

Out of these four options, option number 1 is correct as the statement distribution of elements determined by electron configuration is not true regarding Mendeleev's periodic table.

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Among the given radiations, the one with shortest wavelength, highest energy and highest frequency is ultraviolet radiation.

Electromagnetic spectrum is the arrangement of different radiations in  the order of decreasing wavelength or increasing frequency. The wavelength of an electromagnetic wave is inversely proportional to the frequency and energy.

Thus, as the frequency increases energy of the wave increases and wavelength decreases. The order of waves in the decreasing order of wavelength is, radio waves, microwaves, infrared, visible, ultraviolet, x-ray and gamma ray.

Thus, among the given radiation, the highest energy, highest frequency and shortest wavelength is ultraviolet radiation.

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The Binding Energy per Nucleon of an Al -27 nucleus Electron= 26.981541 amu, Proton = 1.007825 amu, Neutron = 1.008665 amu  is 8.33 MeV

By dividing the total binding energy of the nucleus by the total number of nucleons, one can calculate the binding energy per nucleon. Mathematically,

Binding energy per nucleon is equal to the sum of all the nucleons.

we know the binding energy can be calculate with formulla:

E= Δmc²

Total binding energy (E) is 931.5 MeV/amu

first we should calculate mass defect (Δm)

Total binding energy (E) is 931.5 MeV/amu

proton = 1.007825 amu

Number of protons in Al-27 = 13

So, the total mass of protons ( mp) = 13.101725 amu

neutron = 1.008665 amu

Number of neutrons in Al-27 = 14

So, the total mass of total neutrons ( mn)= 14.121310 amu

Atomic mass of Al-27 26.981541 amu

Thus, the mass defect can be calculate as follows,

Δm=mp+mn−A

Δm= 0.241492 amu

so the binding energy,

E= Δm X total binding energy

E = 0.241494 amu x 931.5 MeV/amu

E =224.95 MeV

The Binding Energy per Nucleon can be calculate as follows:

Binding Energy per Nucleon =           Binding Energy            

                                                Total number of nucleons

=224.95 MeV/27

= 8.33 MeV

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Taking into account the ideal gas law, the number of moles of carbon dioxide is 0.119 moles.

An ideal gas or theoretical gas is a set of separate gaseous molecules separated from each other in such a way that no intermolecular forces are exerted between them.

The ideal gas condition normally occurs at low pressures and high temperatures, which allows each particle to be far from each other so that they do not interact.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the ideal gas law:

2 atm× 2 L= n×0.082 (atmL)÷(molK)× 410 K

Solving:

[2 atm× 2 L]÷ [0.082 (atmL)÷(molK)× 410 K]= n

0.119 moles= n

Finally, the number of moles is 0.119 moles.

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Geothermal power plants use the renewable resource of heat from within the Earth to generate electricity is true .

Define geothermal energy.

Deep in the Earth's core, heat is produced that is known as geothermal energy. A clean, sustainable energy source that can be used to generate heat and electricity is geothermal energy.

Rocks, water, gas, and other geological materials are constantly being warmed by heat radiating from the core. Nearby rocks and aquifers underground are heated by magma. Geysers, hot springs, steam vents, submerged hydrothermal vents, and mud pots can all emit hot water. These are all geothermal energy sources.

They can either be directly heated by capturing their heat or by using the steam they produce to produce power. Buildings, parking lots, and sidewalks may all be heated with geothermal energy.

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The Nernst equation and the link between the standard cell potential and free energy can be used to determine the equilibrium constant of the redox process in an electrochemical cell.

The ratio of the product concentration to the reactant concentration is the equilibrium constant. a fixed value for a certain reaction at a specific temperature. The letter "c" denotes the expression of the equilibrium constant in terms of concentrations.

The standard cell potential, temperature, reaction quotient, and the cell potential of an electrochemical cell are all related by the Nernst equation. The Nernst equation can be used to determine the cell potentials of electrochemical cells even under unusual circumstances.

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The arrangement of the elements according to electron affinity is F > C > He.

Electron affinity is the energy released when one electron is added in the outer most shell of the gaseous element.

For moving left to right electron affinity increase because the force of attraction of nucleus on electron increase and size decrease so electron affinity increase.

So F has higher electron affinity because more energy is released after adding the electron.

In carbon electron negativity is less than F so electrons are less strongly attracted by nucleus than F so electron affinity of F > C

In case of He outermost shell is completely filled so electrons are not gained so has minimum electron affinity.

So electron affinity order is  F > C > He

More energy released by gaining an electron is  F > C > He

More energy absorbed by gaining an electron is  He > C > F

So, F > C > He is the energy released by gaining an electron.

He > C > F absorbs more energy by gaining an electron.

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Answer:

See below for detailed answers to each part of the question.

Explanation:

To solve this problem, we must consider Le Chatelier's Principle, which states the equilibrium position of a system will shift to counteract any changes that occur in the system. This principle can be used to answer each part of your question.

In Part i, we know that N2 is a reactant. Decreasing the concentration of N2 would cause this reaction to shift towards the reactants (to the left), effectively producing more N2 to counteract the change. This would simultaneously decrease the concentration of NH3, since this is a product of the reaction.

Considering the next part, also using Le Chatelier's principle, increasing the pressure would encourage the reaction to shift to decrease the pressure. In order to decrease the pressure, the equilibrium should shift to the side with fewer gas molecules. In this case, there are 4 gas molecules in the reactants and 2 in the products, so the equilibrium position shifts to the products (to the right) to decrease the pressure. This would also increase the amount of NH3, since NH3 is a product.

In Part iii, the temperature is increased. To counteract this change, the reaction will shift to decrease the temperature. Since we know that this reaction is exothermic, the equilibrium will shift towards the reactants (left) to decrease the temperature. This would decrease the amount of NH3.

Finally, in Part IV, if a catalyst is added, this will not change the equilibrium position. Catalysts do not change the overall energy change of a reaction, only the activation energy, so no equilibrium shift will be observed. Thus, the amount of NH3 will not increase/decrease but will remain the same.

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Answer:

I’m struggling with these too! Any help is appreciated

Explanation:

The coefficients in the balanced reaction equations can be seen from the equations;

[tex]2Mg + O_{2} ----- > 2MgO\\2H_{2} O_{2} ----- > 2H_{2} O + O_{2}[/tex]

We know that the equation of the reaction is the equation that would show us how the reactants and the products were combined in the reaction. In the equation of the reaction. we notice that the atoms of the reactants would be broken down and then they would be recombined so as to obtain the products of the reaction.

The we know that a universal law that governs the balancing of the reactant equations is that the number of atoms of each of the elements on the reactants side must be equal to the number of the atoms of the elements that we have on the products side.

In the balanced reaction equation, the coefficients can be used to be able to balance the number of atoms.

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CH3OHCH3OH Only CH3OH, Water has the highest surface tension of the provided liquids among the given molecules because it possesses an intermolecular hydrogen bonding.

Once more, the greater the surface tension of a liquid, the stronger the intermolecular forces of attraction in the liquid. As a result, water has a higher surface tension than methanol. At room temperature, water has one of the greatest surface tensions of any liquid at roughly 72 mN/m. Mercury, a liquid metal with a surface tension of almost 500 mN/m, is the only liquid with a higher surface tension. Take note of the relationship between a liquid's surface tension and the potency of the intermolecular forces: stronger intermolecular forces bonding.

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Renewable energy is more environment friendly.

We know that energy has to do with that which we need for the performance of certain tasks. It is clear that energy is a major driver of the process of development as a lot of the businesses that we do depends on the supply of energy.

We know that getting energy from the non renewable sources is often at a great cost to the environment and that is why the government now tends to focus on the use of energy from the renewable sources.

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The ground state orbital configuration of the nitrogen atom is represented by option C

We define the electron configuration of an element as the way and manner in which the electrons that can be found in the atoms of the element are arranged. We have to note that the orbitals that are in the atom are at different energy levels. The orbitals that are closest to the nucleus are the orbitals that are at the lowest energy levels. As we move outwards towards the outermost shells, the energy of the electrons would continue to increase.

The ground state is the lowest energy state of the atom. This is the energy state where the energy of the atom is at its lowest point. The other higher energy states of the atom a re called the excited states of the atom.

The ground state electron configuration of the nitrogen atom is written as; [tex]1s^2 2s^2 2p^3[/tex].

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The limiting reactant in the reaction shown would be  [tex]Br_2[/tex].

Limiting reactants are reactants whose availability determines the amount of the product that would be formed. In other words, they are reactants that are available in lower stoichiometric quantities as compared to other reactants in chemical reactions.

In the reaction illustrated:

[tex]2 Al (s) + 3 Br_2 (g) --- > 2 AlBr_3 (s)[/tex]

The mole ratio of the reactants is 2:3.

1.0 g of al = 1/27 = 0.037 mol

1.0 g of [tex]Br_2[/tex] = 1/160 = 0.006 mol

The ratio of Al to [tex]Br_2[/tex] is supposed to be 2:3. But only 0.006 mol of [tex]Br_2[/tex] is available. Thus, this will limit the amount of [tex]AlBr_3[/tex] form.

In other words, the limiting reactant is [tex]Br_2[/tex].

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False, The metals have been oxidized because they have lost electrons to oxygen; oxidation is hence the loss of electrons.

The exchange of electrons between an electron donor (which oxidizes) and an electron acceptor occurs in oxidation-reduction or redox processes (that becomes reduced). While reducing agents are quick to give up electrons, oxidizing agents have a high desire for them.

Because they are the primary sources of energy on this planet, both natural and man-made (or "redox"), oxidation-reduction reactions are significant. Large amounts of energy are typically released when molecules undergo oxidation through the elimination of hydrogen or in conjunction with oxygen.

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The number of photons that are in the light is obtained as  133 photons.

We know that the photons are the particles of light and that we can be able to obtain the energy of the photons. Let us note that the photons also have a given wavelength which can be able to calculate with the formula for the energy of the photon.

An adaptation of the Plank's equation that has to do with the wavelength of the wave can be given by the use of the formula;

E = nhc/λ

E = energy

n = Number of photons

h = Plank's constant

c = Speed of light

λ = wavelength

Then we have;

n = Eλ/hc

n =  4.0 x 10^-17 * 600 * 10^-9/6.6 * 10^-34 * 3 * 10^8

n = 2.4 * 10^-23/1.98 * 10^-25

n = 1.33 * 10^2

n = 133 photons

There are 133 photons present

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Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.

Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.

These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.

In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.

This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.

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Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.

Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.

These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.

In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.

This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.

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the IUPAC name of  4 tert butyl 3 chlorophenol will be given as

3-chloro-4-(1,1-dimethylethyl)phenol.

And the structure for the compound can be given as shown in figure.

IUPAC (International Union of Pure and Applied Chemistry), serves the international scientific endeavor in the dual function of a fundamental science and mission-oriented Union.

Naming according to IUPAC is based on naming a molecule's longest chain of carbons connected via single bonds forming alkane, whether in a continuous chain or in a ring.

All other deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities.

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There are numerous distinct compounds listed on the left. List the ones that are zwitterions and those that are not. Zwitter ions are molecules that include two species with opposing charges.

A compound in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the elements interact with one another. These bonds occur as a result by atoms sharing or trading electrons. a material produced by joining two or more distinct elements physically in science. Table salt and water (H2O), that are examples of compounds, are created so when elements oxygen and hydrogen combine.

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The mass (in grams) of HNO₃ that reacted to produce 151.75 grams of H₂O is 531.125 grams

We shall consider the balanced equation to obtain usefull information.

2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O

From the balanced equation above,

36 grams of H₂O were produced from 126 grams of HNO₃

With the above information, we can determine the mass of HNO₃ that reacted to produce 151.75 grams of H₂O. Details below:

From the balanced equation above,

36 grams of H₂O were produced from 126 grams of HNO₃

Therefore,

151.75 grams of H₂O will be produce from = (151.75 × 126) / 36 = 531.125 grams of HNO₃

Thus, the mass of HNO₃ that reacted is 531.125 grams

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Ammonia, or NH3, has a vaporization heat of 23.4 kJ/mol. 915.g of ammonia condenses at 33.5°C, resulting in a 53.832 mol change in entropy, or S.

ΔHvap = 23.4KJ/mol

Mass of NH3 = -915g

T = -33.5° = 239.5k

moles = mass/molar mass  = 915 / 17 g/mol

moles = 53.832 mol

Nitrogen and hydrogen combine to generate the inorganic substance ammonia, which has the formula NH3. Ammonia is an odorless gas with a strong unpleasant odor. It is a stable binary hydride and the simplest pnictogen hydride. In terms of biology, it is a typical nitrogenous waste, especially for aquatic animals, and it considerably contributes to the dietary requirements of terrestrial creatures by acting as a precursor to 45% of the world's food and fertilizers[12]. The production of fertilizers [13] in a variety of shapes and compositions, including urea and diammonium phosphate, uses around 70% of ammonia. Also sprayed straight to the soil is ammonia in its purest form.

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The table, which lists information about the measured acid dissociation constants of three unknown weak acids is 3,2 and 1 respectively.

Acid               [tex]K_{a}[/tex]                    [tex]pK_{a}[/tex]               Relative strength

A                1.6×10⁻¹¹                10.8                          3

B                 1.64×10⁻²              1.78                          2

C                 2.5×10⁻²                1.6                            1

Weak acids are acids that do not completely dissociate in solution. In other words, a weak acid is an acid that is not a strong acid. The strength of weak acids depends on the strength with which they dissociate. The more it dissociates, the stronger the acid. HCl is a strong acid because it dissociates almost completely.

KCl is naturally a salt with a strong basic cation and a strong acidic anion neither of which affect pH paper and has a standard value of pH 7.0 being neutral. shape. Vinegar is a combination of acetic acid and water made by a two-step fermentation process.

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When acid is added to the blood buffer system. Overall, the buffer system in the blood plays a vital role in maintaining the pH of the blood and helping to ensure that the body functions properly.

When acid is added to the blood, it can disrupt the balance of acid and base (pH) in the blood. The body has several mechanisms in place to maintain a relatively constant pH in the blood, known as acid-base homeostasis. One of these mechanisms is the buffer system. A buffer system is a solution that helps to maintain the pH of a solution by resisting changes in pH when an acid or base is added. The buffer system in the blood consists of several different components, including bicarbonate, carbonic acid, and hemoglobin. When acid is added to the blood, the bicarbonate ions in the blood react with the hydrogen ions from the acid to form carbonic acid, which can then dissociate into water and carbon dioxide. This reaction helps to neutralize the acid and maintain the pH of the blood. Similarly, when a base is added to the blood, the carbonic acid in the blood reacts with the hydroxide ions from the base to form bicarbonate ions and water, which helps to neutralize the base and maintain the pH of the blood.

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The normal boiling point of carbon disulfide from the graph is approximately 46 degrees.

A vapor pressure curve refers to a graph of vapor pressure as a function of temperature. In order to determine the normal boiling point of liquid, a horizontal line is drawn from the y-axis at a pressure equal to standard pressure. Boiling will occur when the vapor pressure is equal to the atmospheric pressure. Hence, the normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one standard atmosphere. The standard atmosphere (atm) is a unit of pressure which is equal to 1013.25 millibars, 760 mm Hg, 29.9212 inches Hg, or 14.696 psi.

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