Five kmol of oxygen (O2) gas undergoes a process in a closed system from p1 = 50 bar, T1 = 170 K to p2 = 25 bar, T2 = 200K. Determine the change in volume, in m3.

What's a combustion

It means hydrocarbon burns in presence of excess oxygen to produce carbon dioxide and heat

As solid state is converted to gaseous so randomness increases hence it's spontaneous

Combustion is the process of combining with oxygen to form water and carbon dioxide. It is an exothermic reaction and will release energy. Thus delta H for combustion is negative.

Enthalpy change of reaction is the change in heat absorbed or released by a reaction. If heat is absorbed by the system , the reaction is called endothermic and the change in enthalpy delta H is positive.

For a reaction which release energy, the change in enthalpy delta H will be negative and thus the reaction is said to be exothermic. Combustion is an exothermic reaction.

During combustion new bonds are formed between carbon and oxygen and carbon and hydrogen. Thus bond making is happend more than bond breaking. Bond breaking needs much energy than bond making.

Hence, the released energy is more form combustion and enthalpy change is negative. The process needs no more energy thus the reaction is spontaneous. Thus option C is correct.

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To determine the pKb1 of CO32-, we can use the relationship between pKa and pKb for conjugate acid-base pairs:

pKa + pKb = pKw

where pKw is the ionization constant of water, which is approximately 14. Therefore, we can rearrange the equation to solve for pKb:

The pKb value represents the negative logarithm of the equilibrium constant (Kb) for the reaction of a base with water. In this case, we are interested in the equilibrium reaction between CO32- and water, which can be represented as CO32- + H2O ⇌ HCO3- + OH-.

By utilizing the relationship pKa + pKb = pKw, we can rearrange the equation to solve for pKb. Given that pKa1 of H2CO3 is 6.35, we subtract this value from pKw (approximately 14) to obtain pKb1

pKb = pKw - pKa

pKb1 = 14 - 6.35 = 7.65

Since none of the given answer choices matches the calculated value, it seems there might be an error or omission in the available options. Please double-check the answer choices provided or refer to additional information to obtain the correct pKb1 value for CO32-.

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Answer:

It has a chemical called cinnamaldehyde in it and cinnamaldehyde is a skin irritant

Explanation:

Answer:

B) It is not balanced for oxidation state or for number of atoms

Explanation:

I got this question correct on my Edge quiz, so I know that this is the right answer.

The reactant side has 2 oxygen atoms, while the product side only has 1. This means the mass isn't balenced. In addition, the oxidation (charge) on the reactant side is 0, while it's -2 on the product side. This means the oxidation nor mass is balenced.

Hope that helps you!

Answer:

b

Explanation:

The molar mass of insulin is approximately 0.798 g/mol, calculated using the equation for osmotic pressure and the given values of mass and volume.

To calculate the molar mass of insulin, we can use the equation for osmotic pressure:

π = (n/V)RT

where π is the osmotic pressure, n is the number of moles of solute, V is the volume of the solution in liters, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the given values to appropriate units:

25.0 mg = 0.025 g
5.00 mL = 0.005 L

Next, rearrange the equation to solve for n (number of moles):

n = (πV) / (RT)

Substituting the given values:

n = (15.5 mmHg * 0.005 L) / ((0.0821 L·atm/(mol·K)) * 298 K)

Calculate n:

n ≈ 0.0313 mol

Finally, divide the mass of insulin (0.025 g) by the number of moles (0.0313 mol) to find the molar mass:

Molar mass = 0.025 g / 0.0313 mol

Molar mass ≈ 0.798 g/mol

So, the molar mass of insulin is approximately 0.798 g/mol.


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The appropriately balanced equation for the given chemical reaction, where benzene (\(C_6H_6\)) reacts with hydrogen (\(H_2\)) to form cyclohexane\((C_6H_12)\), is: \(C_6H_6 + 3H_2\)→ \(C_6H_{12\)

A balanced equation is a representation of a chemical reaction that ensures the conservation of mass and charge. It shows the reactants on the left side and the products on the right side of the equation. The number of atoms of each element is equal on both sides, indicating that no atoms are gained or lost during the reaction.

To balance an equation, coefficients are placed in front of the chemical formulas to adjust the number of atoms present. These coefficients represent the relative ratios of the substances involved in the reaction. The goal is to achieve equality between the total number of atoms of each element on both sides of the equation.

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The final concentration of the **salt** in the dialysis bag, after placing it in 4.0 L of distilled water for 12 hours, would be: **diluted**.

When a dialysis bag is immersed in a solution, the process of diffusion occurs, allowing solutes to pass through the semipermeable membrane. In this case, since the dialysis bag is placed in distilled water, which has a lower concentration of solutes, the solutes within the bag will diffuse out into the surrounding water. Over the course of 12 hours, the concentration of the salt within the bag will decrease due to this diffusion process. The final concentration of the salt will depend on its initial concentration and the rate of diffusion. However, without knowing the initial concentration of the salt, it is not possible to determine the exact final concentration. Nonetheless, it can be concluded that the salt concentration would be **diluted** after the process.

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This answers may help you

Atoms are basically the smallest units of matter. They are made up of  protons, neutrons and electrons.

The periodic table is a tabular arrangement of the chemical elements which are organized on the basis of their atomic numbers, electron configurations, and recurring chemical properties. The periodic table lists the elements in order of increasing atomic number and grouped into rows (periods) and columns (groups). The elements in the same column have similar chemical properties, with the elements in the same row having similar outer electron configurations.

Atom X: Number of protons = 6

Atom Y: Number of protons = 6

b. Atoms X and Atom Y are in the same family; but not the same row; in the periodic table.

Hence, Option B is correct.

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The question is:

Question 3 (5 points) (02.06 MC) The table compares some characteristics of two atoms_ Charged Particles Atom Number 0f Neutrons Mass Number] Use the table t0 determine the number of protons for each atom: Then_ choose the statement below that Is true about the two atoms_ points) Atom X and Atom are in the same row; but not the same family; on the periodic table Atoms X and Atom Y are in the same family; but not the same row; in the periodic table; Atom Xis in a column to the right of Atom Y in the periodic table: Atom X and Atom occupy the same position in the periodic table because they are isotopes.

An exothermic process is one that gives off heat.

Explanation:

This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings.

Answer: acetone

Explanation: Acetone has the weakest intermolecular forces, so it evaporated most quickly. Water had the strongest intermolecular forces and evaporated most slowly.

The diagram shows the stages jamila uses to make zinc sulfate and the stages in the correct order include the following below:

This is referred to as a process used to separate solids from liquids or gases using a filter medium.

In the formation of zinc sulfate, the zinc is usually added to concentrated H₂SO₄ and filtered with the use of filter paper through several techniques to ensure that the filtrate is dry and concentrated.

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Answer:

Option C is correct

Explanation:

Covalent substances have weaker intermolecular attractions.

Scored 100% on my quiz on Edge :)

The characteristic that best explains the difference in melting behaviors is

The melting point of covalent substances ( i.e. substances bounded by covalent bonding ) is lower than the melting point of ionic substances, this is because of the weak intermolecular attractions which exists in covalent compounds and this makes atoms in covalent substance to dissociate easily .

Hence we can conclude that the characteristic that best explains the difference in melting behaviors is Covalent substances have weaker intermolecular attractions.

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It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal.

To determine the time it takes for both Cs-137 and Co-60 isotopes to decay until their activities are equal, we can use the decay function for each isotope and set them equal to each other.

The decay function for a radioactive isotope is given by:

A(t) = A₀ * exp(-λt)

Where:

A(t) is the activity at time t,

A₀ is the initial activity,

λ is the decay constant,

t is the time.

The decay constant (λ) can be calculated using the half-life (T₁/₂) of the isotope:

λ = ln(2) / T₁/₂

For Cs-137, the half-life is approximately 30.17 years, and for Co-60, the half-life is approximately 5.27 years.

Let's denote the time it takes for both activities to be equal as t_eq.

For Cs-137:

A(Cs-137) = 100 * exp(-0.693 / 30.17 * t_eq)

For Co-60:

A(Co-60) = 300 * exp(-0.693 / 5.27 * t_eq)

Setting the two equations equal to each other and solving for t_eq:

100 * exp(-0.693 / 30.17 * t_eq) = 300 * exp(-0.693 / 5.27 * t_eq)

Simplifying the equation:

1/3.0 * exp(-0.693 / 30.17 * t_eq) = exp(-0.693 / 5.27 * t_eq)

Taking the natural logarithm (ln) of both sides:

-0.693 / 30.17 * t_eq = -0.693 / 5.27 * t_eq

Solving for t_eq:

t_eq ≈ 35.4 years

It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal. This calculation assumes that there is no other source of radiation or decay affecting the activities of the isotopes.

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Solution :

We know, In an electrolyte solution, the number of dissolved particles is larger because the solute breaks apart into ions. The greater the number of ions, the larger the impact on colligative properties will be.

So, the compound which will dissociate into more number of electrolyte has more vapour pressure.

Out of all given compound K₃PO₄ have highest number of particles after dissociation.

Hence, D) is the required solution.

Answer:

answer this and ill answer that

Explanation:

during a heating or cooling process, how are changes in enthalpy and temperature related?​

The rate of a first-order reaction is inversely proportional to the reactant concentration. The reaction's speed is determined by the rate constant, k.

In science and math, a constant is a stable value that never changes. It can stand for a numerical value like pi or a physical quantity like the speed of light. Equations can be made simpler by using constants to describe relationships. For instance, the gravitational constant in physics is used to determine the force of gravity between two objects. Rate constants are terms used to describe the speed of a chemical reaction in chemistry. Constants are crucial because they offer a standard or point of comparison for comparison and analysis. They can also be used to forecast outcomes and ascertain how systems will behave in various scenarios. A constant's value can be stated as a and is frequently discovered through experimentation or observation.

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it is A it got to be A)-4k

Explanation:

Answer:

plusses give me brainliest after this

The answer is: 1. periodic table

The formulas of the compounds that were shown are;

CaCl2

K2S

AlBr3

BeF2

MgS

Ionic compounds are a type of chemical compound made up of ions, which are atoms or molecules that have a positive or negative charge due to the gain or loss of electrons. In ionic compounds, positive ions (cations) are typically metal atoms, while negative ions (anions) are typically non-metal atoms. These ions are held together in a crystal lattice structure by strong electrostatic forces, forming a solid, crystalline substance.

Ionic compounds typically have high melting and boiling points, and they are often soluble in water. They are also typically poor conductors of electricity in the solid state, but good conductors in the melted or dissolved state due to the movement of ions.

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Hydrogen gas will become the hottest when the same amount of heat is applied to all three substances with the same starting temperature and equal masses.

The specific heat of a substance is the amount of heat required to raise the temperature of one unit of mass of that substance by one degree Celsius. The higher the specific heat, the more heat energy is required to raise the temperature of the substance.

Given that the specific heat of hydrogen gas is 102 times larger than the specific heat of liquid mercury and 12 times larger than the specific heat of elemental sodium, we can conclude that hydrogen gas requires the most heat energy to raise its temperature by the same amount compared to mercury and sodium.

Therefore, when the same amount of heat is added to all three substances with the same initial temperature and equal masses, hydrogen gas will end up the hottest because it requires more heat energy to increase its temperature by the same amount compared to mercury and sodium. In other words, the heat added to hydrogen gas will result in a greater temperature increase than the same amount of heat added to mercury or sodium.

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Answer:

Titanium oxide.

Explanation:

The problem requires calculating the time required for water vapor to achieve a partial pressure of 0.0150 atm on the back surface of a new type of porous material used as food packaging film.

The film is 0.20 cm thick, rests on a nonporous metal plate, and contains liquid water with a vapor pressure of 0.030 atm at 25°C. The effective diffusion coefficient of water vapor in the porous film is 1.3 10 4 cm2/s, and the molecular diffusion coefficient of water vapor in air is 0.26 cm2/s. Assuming that the total system pressure is constant at 1.0 atm and the gas space in the porous film initially contains air, it will take approximately 1100 seconds or 18.3 minutes for the water vapor to reach the desired partial pressure at the back surface of the film.

To determine the time required for the water vapor to achieve a partial pressure of 0.0150 atm at the back surface of the porous film, we need to use Fick's first law of diffusion: J = -D(dC/dz), where J is the diffusion flux, D is the effective diffusion coefficient (1.3 x 10^-4 cm^2/s), and dC/dz is the concentration gradient.

The concentration gradient can be found using the vapor pressure difference (0.030 - 0.0150 atm) and the film thickness (0.20 cm). Convert the pressure difference to concentration using the Ideal Gas Law: C = P/RT, where R is the gas constant (82.06 cm^3.atm/mol.K) and T is the temperature (25°C or 298 K).

Once the concentration gradient is found, solve for the diffusion flux J using Fick's first law. Then, divide the initial concentration of water vapor by the diffusion flux to find the time required for the water vapor to achieve a partial pressure of 0.0150 atm at the back surface of the film.

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The whole phrase is indeed the atoms kinetic energy when solids melt to produce liquids.

Structure stiffness and resilience to changes in volume or form define solids. A solid item does not expand like a gas or flow to conform to the geometry of the space it occupies, unlike a liquid, which does both.

Solid matter keeps a constant size and shape, while liquid stuff adapts to the form of its containment while just slightly changing its volume, and gas material expands to take up the intensity and structure of its container.

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If you drink 2.00 large cups of dark roasted coffee, you would consume 608.0 mg of N-methylpyridinium (NMP).

To calculate this, first, we need to convert the volume of coffee from fluid ounces to liters, using the conversion factor 1 L = 33.814 fl oz:

2.00 large cups × 10.0 fl oz/large cup ÷ 33.814 fl oz/L = 0.591 L

Next, we can use the concentration of NMP in the coffee to calculate how much NMP is in 0.591 L of coffee:

30.4 mg NMP/L × 0.591 L = 17.9584 mg NMP

Therefore, if you drink 2.00 large cups of dark roasted coffee, you would consume approximately 18 mg of NMP.

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Substance A is likely a transition metal such as silver (Ag) with a higher atomic number, and substance B is aluminum (Al), a widely distributed metal occurring only in a bound state

a)The substance A and B are not defined in the question. However, from the information given in the question, we can deduce the following:

Elements E1 and E2 have the same number of electrons in their outer fourth electron shell. The total number of electrons in the electron shells of their atoms differs by 10. The element E2 is among the top ten in distribution in the earth's crust and occurs in nature only in a bound state. Their simple substances A and B are silver-white, electrically and thermally conductive.

This indicates that elements E1 and E2 have the same number of valence electrons but different total numbers of electrons in the shells. Since element E2 is among the top ten in distribution in the earth's crust and occurs only in a bound state, it is likely to be a metal. As a result, the simple substances A and B, which are silver-white and electrically and thermally conductive, are also metals.

b) Metal atoms, according to the metallic bond theory, are held together by the sharing of valence electrons. These electrons are responsible for the excellent electrical and thermal conductivity of metals. Silver-white is a typical color for many metals. As a result, substances A and B may be any metal that fits the criteria described above.To sum up, substance A and B can be any metal that has silver-white color, and is electrically and thermally conductive.

Substance A: Based on the higher number of electrons and similar outer electron configuration, substance A can be identified as a transition metal. Transition metals typically have high atomic numbers, exhibit metallic properties, and are located in the d-block of the periodic table. Examples of transition metals include copper (Cu), silver (Ag), and gold (Au).

Substance B: Given that substance B occurs only in a bound state and is among the top ten in distribution in the earth's crust, it can be identified as a highly abundant and widely distributed metal. One such metal that meets these criteria is aluminum (Al). Aluminum is a silver-white metal that is highly abundant in the earth's crust and is commonly found in minerals and compounds.

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Hydrophobic colloids option b- can be stabilized by adsorption of ions.

Hydrophobic colloids are colloidal particles that repel water molecules and tend to aggregate or coagulate in aqueous solutions. To stabilize hydrophobic colloids, surfactants or stabilizing agents are added to the system.

These surfactants have hydrophobic and hydrophilic regions that can adsorb onto the surface of the colloidal particles, forming a protective layer that prevents their aggregation. This adsorption of surfactant molecules on the particle surface is commonly referred to as "stabilization by adsorption of ions".

The surfactant molecules adsorb onto the particle surface with their hydrophobic tails pointing inward towards the particle surface and their hydrophilic heads pointing outward towards the solvent, creating a stable colloidal dispersion. This stabilization mechanism is commonly used in the formulation of emulsions, suspensions, and other colloidal systems.

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Carbon dioxide (CO2) in the atmosphere first reached 400 parts per million (ppm) in the spring of 2013.

This milestone was observed at the Mauna Loa Observatory in Hawaii, which has been continuously monitoring atmospheric CO2 levels since the late 1950s.

The natural range of CO2 concentrations in the atmosphere over the past 800,000 years has been between 180 and 280 ppm, but due to human activities such as burning fossil fuels and deforestation, atmospheric CO2 levels have been rising steadily since the industrial revolution.

The increase in atmospheric CO2 levels has significant implications for climate change, as CO2 is a potent greenhouse gas that contributes to global warming and climate instability.

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