Serious injuries can occur when students attempt to force the pipet bulb onto the top of the pipet. The blue bulbs we use in lab are not meant to attach to the pipet, they simply rest on the top. Which of the following items will help you be more successful when working with a pipet? O Keep the tip of the pipet submerged when filling O The more aggressive you are with the pipet bulb, the quicker you will get out of lab O It is best to fill the pipet to a point just above the calibration line, then adjust the volume by slowly releasing liquid. O Liquid should fully fill the pipet bulb O Gently place the pipet bulb on the pipet

You would expect to see radiolabeling in molecule CO2. Option D is correct.

Radiolabeled compounds: In a radiolabeled compound, atoms or groups of atoms of a molecule were substituted by similar or different radioactive atoms or the groups of atoms, or certain cations are chelated with some carrier molecules. Labeling can be carried out with isotopes of the same element or of different elements.

Aerobic cellular respiration takes place in the mitochondria, where oxygen is used as the final electron acceptor in the electron transport chain. This process results in the production of ATP, carbon dioxide (CO2), and water as the byproducts. The radioactive oxygen isotope in the form of O2 would be incorporated into the CO2 molecules produced during respiration. Therefore, radiolabeling would be seen in the CO2 produced during cellular respiration.

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--The given question is incomplete, the complete question is

"If you were to expose cells that are undergoing aerobic cellular respiration to a radioactive oxygen isotope in the form of O2, which of the following molecules would you expect to be radiolabeled? A) pyruvate B) water C) NADH D) CO2"--

The correct answer is D) Ca(OH)₂. Ca(OH)₂ is a strong base and will give a solution with a pH greater than 7, but it is not an Arrhenius base in the strict sense as it does not produce OH- ions in the aqueous solution.

It is important to note that the Arrhenius definition of a base is limited to substances that produce hydroxide ions in an aqueous solution. Therefore, although Ca(OH)₂ will increase the pH of an aqueous solution, it is not classified as an Arrhenius base due to its lack of production of hydroxide ions.

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The number of moles in 75 g of [tex]Al_2(CO_3)_3[/tex] would be 0.32 moles.

The number of moles present in a mass of a substance is the ratio of the mass and the molar mass of the substance.

Mathematically, mole = mass/molar mass

Molar mass of  [tex]Al_2(CO_3)_3[/tex] = 233.99 g/mol

Mass of  [tex]Al_2(CO_3)_3[/tex] = 75 grams

Number of moles in 75 g of   [tex]Al_2(CO_3)_3[/tex] = 75/233.99 = 0.32 mol

In other words, the number of moles in 75 g of [tex]Al_2(CO_3)_3[/tex] is 0.32 moles.

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A sharp melting point is an indication of high molecular homogeneity, meaning the molecules in the sample have a high degree of similarity in their shape and structure.

The product of the reaction has a sharp melting point, indicating that it is either meso-hydrobenzoin or a racemic mixture of the (1R, 2R) and (1S, 2S) enantiomers.

However, it is not possible for the product to be either the (1R, 2R) or the (1S, 2S) pure enantiomer. This is because enantiomers have opposite stereochemistry and cannot be distinguished from each other based on physical properties such as melting point, boiling point, or solubility. Therefore, if the product has a sharp melting point, it must be either meso-hydrobenzoin or a racemic mixture of enantiomers, but it cannot be a pure enantiomer.

In conclusion, a sharp melting point alone is not enough to determine the stereochemistry of the product. Further analysis, such as chiral chromatography or circular dichroism spectroscopy, would be required to determine the absolute configuration of the enantiomers.

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The density of the liquid in g/mL to the correct number of significant digits is 1.21g/ml.

Mass of flask in the liquid= 159.9 g

Mass of empty flask = 152 g

Mass of liquid= 159.9 g- 152 g = 7.9g

Density = Mass/volume = 7.9g/6.50ml= 1.21g/ml

Density (volumetric mass density or particular mass) is the substance's mass in line with a unit of extent. The symbol most usually used for density is ρ (the decreased case Greek letter rho), despite the fact that the Latin letter D also can be used. Mathematically, density is defined as mass divided by extent.

The density of fabric varies with temperature and stress. this variation is usually small for solids and drinks but a whole lot greater for gases. increasing the strain on an object decreases the quantity of the object and therefore will increase its density. increasing the temperature of a substance (with some exceptions) decreases its density via increasing its quantity. In most materials, heating the bottom of fluid outcomes in convection of the warmth from the bottom to the pinnacle, due to the decrease in the density of the heated fluid, which reasons it to rise relative to denser unheated material.

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Yes, thought experiments are still relevant to science today. A hypothetical question is a mental simulator or model used to investigate and assess scientific ideas, hypotheses, and phenomena.

Really, the four educational specializations that comprise the disciplines are genetics, geology, and physics.. Scientists who specialize in chemistry and physics examine the qualities of things and how they interact with one another, whereas biology study living things such as plants and humans.

Since it is a tool that helps every other field solve issues, mathematics is regarded as the parent of all sciences. The foundation of other disciplines like biology, chemistry, and physics is simple chemical equations.

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500 mL of stock solution has the molarity of 4 M. When, it is diluted to 4 L or 4000 mL  has a molarity of 0.5 molar.

Molarity of a solution is a common term to express its concentration. It is the ratio of number of moles of solute to the volume of solution in liters.

Let M1 and V1 be the volume and molarity of a stock solution and M2 and V2 be the molarity and volume of solution prepared from the stock solution or reacting with it.

Then, M1V1 = M2V2.

Given M1 = 500 ml

V1 = 4.000 molar

the volume of the diluted solution V2 = 4L = 4000 ml.

then molarity M2 = (500 ml × 4 M)/4000 mL = 0.5 M.

Therefore, the molarity of the diluted solution is 0.5 M.

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The rate law for the overall reaction is, [tex]k[A][B][/tex].

Rate law, It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

As we are given the mechanism for the reaction :

Step 1 :  [tex]A+B \rightarrow AB[/tex]  (slow)

Step 2 : [tex]A+AB \rightarrow A_2B[/tex] (fast)

Overall reaction : [tex]2A+B \rightarrow A_2B[/tex]

The rate law expression for overall reaction should be in terms of A and B.

As we know that the slow step is the rate determining step. So,

The slow step reaction is, [tex]A+B \rightarrow AB[/tex].

The expression of rate law for this reaction will be, [tex]k[A][B][/tex]

Hence, the rate law for the overall reaction is [tex]k[A][B][/tex].

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After compression, the gas will have a pressure of 6.76 atm.

The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in kelvin. This formula can be used to determine the pressure of a gas.

The pressure of the gas after compression can be computed using the formulas below, assuming that the number of moles of gas and the temperature remains constant throughout the compression:

1.64 L P2 = (nRT) / V2 = (nRT)

where V2 is the compressed volume and P2 is the compressed pressure. We must enter the known values into the equation in order to determine P2:

P2 is equal to (1.43 atm * 7.7 L) / 1.64 L, or 6.76 atm.

Let's first go through PV = nRT, the ideal gas law. P stands for pressure in atmospheres, V for volume in liters, n for moles of particles, T for temperature in Kelvin, and R for the ideal gas constant in this equation (0.0821-liter atmospheres per moles Kelvin).

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1.) The compound that is least soluble at 20 °C is KClO₃ and at 80 °C, it is  So₂

2.) The substance that is the most soluble at 10 °C is KI, NaNO₃ at 50 °C, and NH₄Cl at 90 °C.

3.) The solubility of KNO₃ is most affected by changes in temperature.

4.) The solubility of NaCl is least affected by changes in temperature?

5.) (A) 50 grams of KNO₃ at 50 °C is unsaturated

(B) 100 grams of NaNO₃ at 80 °C is unsaturated

(C) 30 grams of KNO₃ at 25 °C is unsaturated

(D) 50 grams of KCI at 80 °C is saturated

(E) 65 grams of NH₄Cl at 70 °C is supersaturated

F) 90 grams of KNO₃ at 60 °C is unsaturated

6.) The solubility of NH₃ decreases as the temperature goes from 20 °C to 80 °C.

A graph of solubility (measured in g/100 g water) versus temperature (measured in °C) is known as a solubility curve. On the same graph, solubility curves for various substances are frequently depicted, allowing for easy comparisons.

Solutions that are saturated, saturated, or supersaturated can be determined from a solubility curve.

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1) Beta -carotene is easier to be detected

2) Curve 2

3) If we plot absorbance against concentration, we get a straight line passing through the origin (0,0).

ε is a measure of the amount of light absorbed per unit concentration".

molar absorptivity affects the limit of detection of a particular compound.

Molar absorptivity, also known as molar extinction coefficient or molar absorptivity coefficient, is a measure of a substance's ability to absorb light at a particular wavelength. It is defined as the ratio of the absorbed radiant power to the incident radiant power, per unit concentration of the absorbing substance and unit path length.

In mathematical terms, the molar absorptivity is represented by the symbol ɛ (epsilon) and is calculated using the Beer-Lambert law:

A = ɛcl

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The majority of higher species, including humans, would asphyxiate in a matter of seconds if the whole atmosphere were destroyed. Within a few minutes, other terrestrial animals would follow, and within a few hours, vegetation. The abrupt decrease in pressure would also have an odd impact on the waters.

Climate control: By capturing solar heat and dispersing it uniformly over the globe, the atmosphere aids in regulating the Earth's temperature.

Protection from dangerous radiation: The atmosphere shields life on Earth from ultraviolet (UV) rays and other harmful solar energy.

Air pollution control: Through natural processes like precipitation, photo-oxidation, and deposition, the atmosphere helps to purge itself of dangerous pollutants including carbon monoxide, nitrogen oxides, and sulfur dioxide.

Control of moisture: It is essential for regulating the Earth's water cycle because it stores, moves, and releases moisture as precipitation.

Supports life: offers the gases required for life, such as oxygen, which is important for respiration, and nitrogen, which aids in controlling soil pH.

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The following options correctly describe an alkynes. Select all that apply are  a. An alkyne contains a C-C triple bond. and b. A terminal alkyne possesses a C-C triple bond at the end of the chain.

Hydrocarbons are a type of organic chemical compound composed of hydrogen atoms and carbon atoms. In everyday life we ​​encounter many hydrocarbon compounds, such as kerosene, gasoline, natural gas, plastics and others. One type of hydrocarbon compound is aliphatic hydrocarbon which has straight chain, branch chain and circular chain compounds.

Alkynes are aliphatic unsaturated hydrocarbon compounds that have one or more triple bonds between carbon atoms This compound has a triple bond that allows addition reactions, polymerization, substitution and combustion. This arrangement of bonds results in a very electron-rich C-C region with sigma bonds in it.  Based on the location of the triple bond, there is a type of terminal alkyne if the triple bond is located at the end of the chain. Example: CH 3 C CH. Then the two answers above twin the alkyne correctly.

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Jones's test, also known as the chromic acid test, is used to determine the presence of aldehydes in a sample.

A positive Jones's test results in the formation of a blue or greenish-blue precipitate, indicating the presence of an aldehyde. On the other hand, a negative Jones's test results in no visible precipitation, indicating the absence of an aldehyde.

The Jones's test works by adding a small amount of chromic acid (CrO3) to a reaction mixture containing the aldehyde. If an aldehyde is present, it reacts with the chromic acid to form a complex that has a characteristic blue or greenish-blue color. This color change indicates a positive Jones's test. If no aldehyde is present, there will be no reaction and no color change, resulting in a negative Jones's test.

Jones's test is a useful tool for the identification of aldehydes in organic chemistry and is widely used in the laboratory as a qualitative test for the presence of aldehydes. However, it is important to note that the test is not quantitative and should not be used to determine the amount of aldehyde in a sample.

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c) hyposmotic.Based on the scenario in Part H, the added solution was  osmotic compared to the original 300 mOsM concentration of the body.

Osmosis is a process in which molecules of a solvent (such as water) move through a semi-permeable membrane from a region of higher concentration to a region of lower concentration. This process can occur in both living and non-living systems, and is essential for the proper functioning of cells. In living organisms, osmosis is used to regulate the levels of water and other molecules inside and outside the cell, as well as to absorb nutrients. In non-living systems, osmosis is often used in water purification and desalination processes. The osmotic pressure, or osmolarity, is the force that drives the movement of molecules through the semi-permeable membrane. Osmosis is a fundamental process in biology, chemistry, and other scientific fields, and is essential to many everyday processes.

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The solvent in this solution is water and the solute is solid LiF. Together, the water and LiF form a solution.

The solvent is the substance that does the dissolving and is present in the greatest amount, while the solute is the substance that is being dissolved and is present in a lesser amount. In this case, water is the solvent, dissolving the solid LiF, which is the solute, to form the solution.

A solution is a mixture of two or more substances, where one substance is evenly distributed throughout the other. The substance that is evenly dispersed is called the solute and the substance that does the dispersion is called the solvent. In the statement given, solid LiF is the solute and water is the solvent. The solvent is the component that is present in the largest amount and the solute is the component that is present in a smaller amount.

The solubility of a solute in a solvent depends on various factors such as temperature, pressure, and the chemical nature of both the solute and the solvent. In this solution, solid LiF dissolves in enough water to form a homogeneous mixture, meaning that the properties of the solution are the same throughout its entire volume.

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The most stable chair conformation for a cyclohexane molecule has all substituents in an axial position or all substituents in an equatorial position.

cyclohexane are those that extend above or below the plane of the ring, while equatorial substituents are those that are in the plane of the ring. In general, bulky substituents are more stable in an equatorial position as they can minimize interactions with other substituents on the ring. In the case of the molecule described, the methyl group "a" is axial and the methyl group "b" is equatorial. This arrangement is favored because the methyl groups are small and do not cause significant steric hindrance in either axial or equatorial positions.

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The volume of 1.0 M Cu2+ solution required to fully react with 1.0 g of Fe is 26.9 mL (0.0269 L).

When a liquid becomes a gas, this process is called evaporation. If you boil water in a pot, you can observe the evaporation. Evaporation is done in two ways:

evaporation and boiling.

Evaporation occurs when sunlight hits water, causing the water to become steam and rise into the air.

Evaporation is defined as a phase transition of a compound or element that occurs during the boiling or sublimation process. Evaporation is just a type of evaporation that normally occurs at temperatures below the boiling point.  

moles of Fe = mass of Fe / molar mass of Fe

Mole Fe = 1.0 g / 55.845 g/mol

mol Fe = 0.0179 mol

According to the balanced chemical formula, 3 mol Cu2+ are required to react with 2 mol Fe. Therefore, the number of moles of Cu2+ required to react with 0.0179 moles of Fe is

mol Cu2+ = (3/2) x mol Fe

mol Cu2+ = (3/2) x 0.0179 mol

mol Cu2+ = 0.0269 mol

Now, using the definition of molarity, we can calculate the volume of 1.0 M Cu2+ solution required to provide 0.0269 mol Cu2+.

mole = concentration x volume

volume = moles / concentration

Volume = 0.0269 mol / 1.0 mol/L

Volume = 0.0269L

Therefore, the volume of 1.0 M Cu2+ solution required to fully react with 1.0 g of Fe is 26.9 mL (0.0269 L).

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Answer:

1) Therefore, 8.79 * 10^23 oxygen molecules are needed to react completely with 135 grams of sodium.

2)1.24 x 10^3 g / (2 moles AlCl3/2 moles Al) = 622 grams of aluminum

Explanation:

1)To determine the number of oxygen molecules needed to react completely with 135 grams of sodium, we need to use the balanced chemical equation for the reaction. The equation states that 4 moles of sodium (Na) react with 1 mole of oxygen (O2) to form 2 moles of sodium oxide (Na2O).

Given that 135 grams of sodium is equal to 135/23 = 5.87 moles, then 5.87 moles of sodium will react with 5.87 moles / 4 moles of sodium = 1.47 moles of oxygen.

So, 1.47 moles of oxygen is equal to 1.47 * Avogadro's number (6.022 * 10^23) = 8.79 * 10^23 oxygen molecules.

Therefore, 8.79 * 10^23 oxygen molecules are needed to react completely with 135 grams of sodium.

2)To determine the amount of aluminum needed to produce 7.5 x 10^30 molecules of aluminum chloride, we need to first determine the formula weight of aluminum chloride. The formula weight is calculated by summing up the atomic weights of all the elements in the formula:

Aluminum chloride: Al + Cl + Cl = 27 g/mol + 35.5 g/mol + 35.5 g/mol = 98 g/mol

Next, we need to convert the number of molecules of aluminum chloride to grams:

7.5 x 10^30 molecules x 98 g/mol/6.022 x 10^23 molecules = 1.24 x 10^3 grams

Since two moles of aluminum reacts with three moles of chlorine to produce two moles of aluminum chloride, the amount of aluminum needed can be calculated as follows:

1.24 x 10^3 g / (2 moles AlCl3/2 moles Al) = 622 grams of aluminum

Here are the missing constitutional isomers with the molecular formula C4H10O:

• 2-Methyl-1,3-propanediol (CH3CHOHCH2CH3) Functional group: Alcohol (-OH)

• 1-Butanol (CH3CH2CH2CH2OH) Functional group: Alcohol (-OH)

And here's the complete list of all the constitutional isomers with the molecular formula C4H10O along with their functional groups:

• 1-Butanol (CH3CH2CH2CH2OH) Functional group: Alcohol (-OH)

• 2-Methyl-1,3-propanediol (CH3CHOHCH2CH3) Functional group: Alcohol (-OH)

• 1,2-Propanediol (CH3CH2OHCH2CH3) Functional group: Alcohol (-OH)

• Dimethyl ether (CH3OCH3) Functional group: Ether (-O-)

Note: In organic chemistry, constitutional isomers, also known as structural isomers, are compounds that have the same molecular formula but a different arrangement of atoms in the molecule.

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A chemist ran the reaction and obtained 5.10 g of ethyl butyrate. Therefore, 58.766 % is the percent yield.

An ester is ethyl butyrate, known colloquially as ethyl butanoate or butyric ether. Propylene glycol, propanone, as well as kerosene are all soluble in it. It is extensively employed as artificial flavoring mimicking orange juice and is consequently utilized in practically all orange juices produced, even those labelled as "fresh" or "concentrated".

It is also employed in alcoholic drinks, as a solvents in fragrance items, and as a cellulose plasticizer.

C[tex]_4[/tex]H[tex]_8[/tex]O[tex]_2[/tex] +  C[tex]_2[/tex]H[tex]_5[/tex]OH [tex]\rightarrow[/tex]C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_2[/tex] + H[tex]_2[/tex]O

Molecular mass of butanoic acid=88 g/mole

Molecular mass of ethyl butyrate=116 g/mole

(7.10 g) / (88 g/mole) = 0.0806 moles of butanoic acid

0.0806 moles × 116 g/mole = 9.359 g of ethyl butyrate

% yield = (actual yield /theoretical yield) * 100

% yield = (5.50 g/9.359 g) * 100

% yield = 58.766 %

Therefore, 58.766 % is the percent yield.

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Ethylene, acetylene, and benzene are all unsaturated hydrocarbons with different molecular structures. In terms of decreasing chemical shift, the order would be: benzene > ethylene > acetylene.

The signal for benzene appears at the highest chemical shift due to the deshielding effect of the delocalized pi electrons in the aromatic ring. Ethylene comes next because the double bond causes some deshielding of the hydrogens, but not as much as in benzene. Acetylene has the lowest chemical shift because the triple bond causes less deshielding of the hydrogens compared to the double bond in ethylene.

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d) (CH3)2C=CH2/H3PO4 does not give isopropylbenzene as a product upon reaction with benzene.

Benzene is known to have many derivatives, compounds made by replacing one or more of the hydrogen atoms present in benzene.

Phenol is used to make carbolic acid, carbolic acid is used as a disinfectant in making carbolic acid, usually for bathrooms and floors.

Benzoic acid is often used as a food and beverage preservative, benzoic acid is also very difficult to dissolve in water. Often used in the manufacture of salt, sodium salt which is easily soluble in air.

This benzene compound derivative is often added to powders and ointments, its function as an antifungal or fungal agent.

This benzene derivative compound is also known as aspirin, whose function is used as an analgesic agent.

Included in the class of benzene compounds is Paracetamol, known as acetaminophen, in the form of a drug that has the same function as aspirin but is safer for the stomach if consumed.

TNT is called a benzene derivative compound that is widely used as an explosive, a benzene derivative compound obtained by forming toluene.

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Overall, chemical exposure is a relatively small contributor to the leading causes of death in the US. Compared to the top causes of death in the US, chemical exposure causes far fewer deaths.

Chemical exposure is the contact of a person or organism to a chemical substance that can cause health effects. It occurs when a person is exposed to a hazardous chemical agent, either through inhalation, skin contact, or ingestion. This can include exposure to chemicals from air pollution, industrial chemicals, or occupational exposures.

According to the Centers for Disease Control and Prevention (CDC), the top ten causes of death in the US are heart disease, cancer, chronic lower respiratory diseases, unintentional injuries, stroke, Alzheimer's disease, diabetes, influenza and pneumonia, kidney disease.

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The location that is the most likely source of young sand with little quartz, that is dark in color, and that does not bubble when acid is added to it is a volcanic island (C)

The presence of either black basalt or green olivine gives volcanic sand its characteristically dark appearance. Volcanic sand is relatively young and, with the exception of obsidian particles, contains very little or any quartz at all. The majority of volcanic oceanic sands can be found on volcanic islands. Sand grains are created when dissolved mineral matter, primarily calcium carbonate, undergoes the process of precipitation in water, this results in the formation of precipitate sand.

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Yes, the chemical energy of a unit of graphite is lower than the chemical energy of a unit of diamond.

This is because the arrangement of carbon atoms in diamond has a higher cohesive energy per unit volume than that of graphite, making it more energetically stable. Diamonds also have stronger carbon-carbon bonds than graphite, which further contributes to their higher energy.

Graphite is composed of layers of carbon atoms arranged in a hexagonal lattice, while diamond is composed of carbon atoms arranged in a tetrahedral lattice structure. The arrangement of atoms in diamond increases the strength of the carbon-carbon bonds, resulting in a higher cohesive energy per unit volume than graphite.

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The atmospheric pressure at the summit of Mount Everest is 253 mmHg.

M(air) = 0.21x2xM(O) + 0.79x2xM(N) = 29x10^(-3)kg/mole

Assuming that air can be treated as an ideal gas (pV=nRT) express the density of air (ρ) as a function of the other state variables and the molar mass M.

p = pressure

V = volume

R = ideal gas constant

T = temperature

n = the amount of gas, measured in moles

ρ = mass(kg)/V, n=m/M where m is mass measured in kilograms and M is molar mass with units kg/mole. A mole is 6.022x10^23 atoms/molecules.

The ideal gas law rewritten: p(m/ρ)=(m/M)T

Rearranging the variables to write the density in terms of all the other variables we have:

ρ = (M/(RT))p

The hydrostatic equation Δp=ρgΔy  describes the change in pressure with depth for an incompressible fluid. This assumption is not valid for air in the atmosphere. Air in the lower parts of the atmosphere is “compressed” by the air above it. However, for an infinitesimally thin layer of air the equation holds.

g = gravitational acceleration (on Earth=9.8 m/s^2)

Δy = a difference in vertical distance

Δp = a difference in pressure between the interval in distance

We do not want the change in pressure, we want to write an equation for pressure, p, as a function of the vertical distance y.

For very small/infinitesimal intervals the theory of calculus tells us that we can write Δy and Δp and dy and dp. If we add up all the intervals over the entire height of the atmosphere we can see how the two variables depend on each other at different heights and derive the equation that will tell us how pressure depends on a specific point in the height. We add up the infinitesimal intervals by doing an integral.

dp/dy=-ρg    

For large distances air is compressible and therefore density is not constant. Density can be written in terms of pressure as found in part b

dp/dy = -(Mg/RT)p→ ∫dp/p = -(Mg/RT)∫dy

ln(p1/p2) = -(Mg/RT)(y2-y1)

p2 = p1exp (-(Mg/RT)(y2-y1))

We have assumed that temperature and g are constant at all heights, not realistic. However, the answer is a good approximation compared to more accurate values and the equation demonstrates the general trend.

Use the equation you derived where you are trying to find p2 where y2 is 8848 meters, p1 is the pressure at sea level 1 atmosphere, M is 29x10^(-3)kg/mole, T is the average air temperature in 273 Kelvin, and y1 is zero.

p2 = 0.33289 atm or 253 mmHg

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Change is inevitable as everything in the world changes. some are man-made and some are natural.

A change may be categorized under chemical change and physical change:

Physical change

A substance is termed to be physically changed when only the physical property changes such as shape, size, color, and state, and its chemical position remain unchanged.

1- Change can be temporary in nature.

2- Internal structure remains unchanged.

3- Physical changes are mostly reversible.

Chemical change

when the change is internal it becomes permanent in nature as a result, it will form or break the molecules leaving behind the changed substance.  

1- Changes are mostly permanent in nature.

2- A chemical change is irreversible and therefore the opposite of physical change.

3- One or more than one substance is formed.

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According to law of conservation of mass, the number of atoms of reactants and products is equal.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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