Suppose that 4.4 l of methane at a pressure of 870 torr is transferred to a vessel of volume 2.4 l. what is the final pressure of methane if the change occurs at constant temperature?
answer in units of torr.

\(\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}\)

\(\\ \sf\longmapsto Volume=\dfrac{Mass}{Density}\)

\(\\ \sf\longmapsto Volume=\dfrac{40000}{790}\)

\(\\ \sf\longmapsto Volume=50.6m^3\)

A chemical equation must be balanced. this means that the same number and type of atoms must appear on both sides of the equation .

In other words, both sides of the reaction have an equal balance of mass and charge. The amount and types of atoms on both sides of the reaction arrow must match for the chemical equation to be balanced.

To comply with the law of conservation of mass, which stipulates that matter cannot be generated or destroyed in a closed system, chemical equations must be balanced.

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The equivalence between the weak form and strong form of 2D Euler-Bernoulli is achieved through the principle of virtual work.

The Euler-Bernoulli equation describes the bending of a beam subjected to transverse loads. There are two forms of this equation: the weak form and the strong form. The weak form assumes that the displacement is a continuous function of position and approximates the bending moment as a linear function of the displacement. The strong form, on the other hand, assumes that the displacement is a twice differentiable function of position and approximates the bending moment as a second-order differential operator acting on the displacement.

In the case of the 2D Euler-Bernoulli equation, the weak form and strong form are equivalent. This means that the solutions obtained from either form will be the same. However, the weak form is often easier to use in practical applications because it requires less mathematical rigor and is more computationally efficient. The strong form is used mainly for theoretical purposes and for proving the existence and uniqueness of solutions.

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Answer:

there is 7 periods and 18 groups

Explanation:

Podemos atraer dos objetos considerando una barra de zinc y una barra de hierro al convertir una barra de hierro en un imán.

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Answer:

Its valancy is 1.

As it has the formula OH-.

It has valancy 1.

hope it helps..

The creation of an appropriate atomic-scale model, from which we may extract data on electrical characteristics or specific chemical variables, such as reaction energies and activation barriers, is essential to this strategy.

One of the main topics of study in the discipline of solid state physics is the modelling of bulk materials and surfaces at the atomic scale.

Ab initio calculations are anticipated to shed further light on the energy associated with atomic movements, electronic exchanges, and other yet more sophisticated systems.

Thus,The atomic number is the number of protons in the nucleus of an atom. The number of protons defines the individuality of an element.

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PbI₂ (lead iodide) will be formed when Potassium Iodide reacts with Lead (II) Nitrate.

This type of equation which denotes the equal number of atoms of reactants and products in a chemical reaction.

The balanced equation between Potassium Iodide and Lead (II) Nitrate is shown below:

2KI₍s) + Pb(NO₃)₂₍aq) → PbI₂(s) + 2KNO₃(aq)

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The age of that rock will be A. 2,000 million years.

The half-life period can be mathematically represented as follows,

t1/2 = 0.693/ Decay Constant

Half-life and the radioactive decay rate constant λ are inversely proportional which means the shorter the half-life, the larger λ and the faster the decay.

Decay Constant = 0.693/1000 * 106 years = 6.93*10-10 yr-1

We know that the radioactive decay equation as,

N = N0 e- (Decay Constant * Time)

N/N0 = 1/3 = e(6.93*10-10 yr-1 * time)

Time = 1600 * 106 years.

Time=2,000 million years

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Complete question:

The Half-Life Of A Radioactive Isotope Is 1,000 Million Years. Scientists Testing A Rock Sample Discover That The Sample Contains Three Times As Many Daughter Atoms As Parent Isotopes. What Is The Age Of The Rock? A. 2,000 Million B. 1,000 Million C. 500 Million D. 250 Million

the mass defect of Li-7 is -0.035279 u and the nuclear binding energy per nucleon is 5.60553 × 10⁻¹² J/nuclide.

Given data:

Atomic mass of Li-7, A = 7.016003

The atomic mass of Li-7 is the sum of the number of protons and neutrons in it. Therefore, the number of neutrons in Li-7 is:

Neutrons = Atomic mass - Protons= 7.016003 - 3= 4.016003The mass of 3 protons and 4.016003 neutrons in Li-7 is: Mass of protons + Mass of neutrons = (3 x 1.007276) + (4.016003 x 1.008665) = 3.021828 + 4.029454 = 7.051282 u

Therefore, the mass defect in Li-7 is:

Mass defect = Actual mass - Calculated mass

= Atomic mass - Mass of protons and neutrons

= 7.016003 - 7.051282

= -0.035279 u

Nuclear Binding Energy per nucleon (BE/A) can be calculated using the formula:

BE/A = [Δm.c² / A]

where Δm is the mass defect and c is the speed of light which is 2.998 × 10⁸ m/s.

Substituting the values in the above formula:

BE/A = [(-0.035279) × (2.998 × 10⁸)² / 7]= 5.60553 × 10⁻¹² J/nuclide

Therefore, the mass defect of Li-7 is -0.035279 u and the nuclear binding energy per nucleon is 5.60553 × 10⁻¹² J/nuclide.

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The maximum production rate of acetyl-CoA under condition 1 is closest to 1 micromole/sec.

The correct option is A.

The maximum production rate of acetyl-CoA under condition 1 is determined from the reaction conditions.

For Condition 1:

The maximum concentration of acetyl-CoA is 60 micromoles

The time taken to reach the maximum concentration of acetyl-CoA is 60 seconds.

The maximum production rate of acetyl-CoA under condition 1 can be calculated by dividing the maximum concentration of acetyl-CoA (60 micromoles) by the time taken (60 seconds):

Maximum production rate = 60 micromoles / 60 seconds = 1 micromole/second

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Answer: A-: Mg BELONGS TO Group 2, B:- O belongs to Group 16 and C-: Fe belongs to Group 8

Explanation:

A -              Mg:

Electronic distribution: 1s² 2s² 2p⁶ 3s²

Group in the periodic table: Magnesium (Mg) belongs to Group 2 (or Group IIA), also known as the alkaline earth metals group.

B -         O:

Electronic distribution: 1s² 2s² 2p⁴

Group in the periodic table: Oxygen (O) belongs to Group 16 (or Group VIA), also known as the chalcogens.

C -      Fe:

Electronic distribution: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶

Group in the periodic table: Iron (Fe) belongs to Group 8 (or Group VIIIB), also known as the transition metals.

Answer:

1001

Explanation:

Zeroes between non zero digits are significant

Answer:

1001 g and 120.0 mL

Explanation:

Zeros in-between natural numbers are significant

If your number has a decimal place, and you have zeroes after a natural number, then all the zeros are sig figs.

Ex: 10000.0 = 6 sig fig

Not: 0.00001 = 1 sig fig

Not: 0012.0 = 3 sig fig

Answer:

False

Explanation:

Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.

Answer:

false :)

Explanation:

The enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) is 571.6 kJ.

The enthalpy of the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) can be calculated by summing the enthalpies of the individual reactions involved. The given information provides the enthalpy change for the decomposition of CaCO3 (s) and the combustion of C (s) to form CO2 (g). By combining these reactions, the enthalpy change for the overall reaction can be determined.

The given reactions are:

CaCO3 (s) -> CaO (s) + CO2 (g) (H = 178.1 kJ)

C (s, graphite) + O2 (g) -> CO2 (g) (H = -393.5 kJ)

To calculate the enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g), we need to subtract the enthalpy change of reaction 2 from the enthalpy change of reaction 1. Since the enthalpy change is an extensive property, we can subtract the enthalpies directly:

ΔH = H(reaction 1) - H(reaction 2)

= 178.1 kJ - (-393.5 kJ)

= 178.1 kJ + 393.5 kJ

= 571.6 kJ

Therefore, the enthalpy change for the reaction CaCO3 (s) -> CaO (s, graphite) + O2 (g) is 571.6 kJ.

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Explanation:

burning molecules release energy combine and release energy usually one of the two molecules is oxygen or something else chemically like it called an oxidizer when the molecules combine and release energy it is released in the form of heat and often light.

The osmotic pressure of the solution is approximately 247 kPa. Thus, the correct answer is option a. 247 kPa.

To calculate the osmotic pressure of the solution, we can use the formula:

π = MRT

Where:

π = osmotic pressure

M = molarity of the solute

R = ideal gas constant (8.314 L kPa K^(-1) mol^(-1))

T = temperature in Kelvin

First, let's calculate the molarity (M) of the urea solution:

Molarity (M) = moles of solute / volume of solution (in liters)

Moles of urea = mass of urea / molar mass of urea

Molar mass of urea = 60.06 g/mol

Moles of urea = 18.0 g / 60.06 g/mol = 0.2998 mol

Molarity (M) = 0.2998 mol / 3.00 L = 0.0999 M

Now we can calculate the osmotic pressure using the given values:

T = 25 °C = 25 + 273.15 K = 298.15 K

π = (0.0999 M) * (8.314 L kPa K^(-1) mol^(-1)) * (298.15 K)

π ≈ 247 kPa

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Only C-C and C-H bond vibrations can be seen in their IR spectrum.

Acetophenone has an odour and appearance similar to that of oranges and is a white liquid with a sweet, pungent flavour. freezes in cold temperatures. water-soluble to a little extent and denser than water. as a result, sinks in water. more dense than air vapour. mildly irritating to the eyes and skin. High quantities of vapours can be addictive. a flavouring, solvent, and catalyst for polymerization.

Acetone has had one of its methyl groups replaced by a phenyl group to become acetophenone, a methyl ketone. It functions as an animal metabolite, a xenobiotic, and a photosensitizing agent.

Acetophenone is a chemical that is used as a flavouring agent in food, a fragrance in soaps and perfumes, and a solvent for polymers and resins.

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Answer:

yellow

if not sorry that's though the best answer

Explanation:

Answer

449.4 grams

Explanation

The balanced chemical equation of the reaction is;

From the balanced chemical equation;

3 moles of H₂ reacted with 1 mole of N₂ to produce 2 moles of NH₃

Molar mass of H₂ = 2.016 g/mol

Molar mass of N₂ = 28.0134 g/mol

Molar mass of NH₃ = 17.031 g/mol

Convert mole to gram using the formula;

For 1 mole N₂

For 3 moles H₂

For 2 moles NH₃

We can now calculate, the mass of NH₃ that can be produced from 79.8 grams of H₂ as follows:

From the balanced equation we can say;

6.048 grams H₂ → 34.062 grams NH₃

∴ 79.8 grams H₂ → x grams NH₃

Therefore, 449.4 grams of Ammonia is produced if you started with 79.8 grams of Hydrogen.

Answer: Mg is a cation and Cl is an anion

Explanation: In more detail, if you look at the periodic table, the group number (or columns) of the elements, describe how many valence electrons, or how many electrons the element has available to have a complete an electron shell. Magnesium being in group 2, it has one 2 electrons that will be "donated" to an anion that it bonds with. However, Chlorine being in group 17, (look at the single digit number for double digit groups), it has 7 valence electrons. Knowing that a full electron shell is usually 8 electrons, it needs only one. Since Magnesium has 2 valence electrons to give away, two atoms of Chlorine gas will then bind to the Magnesium, where the 2 Chlorine atoms will take the electrons to fill their shells. Magnesium Chloride, in terms of charges when in ions, [Mg]2+ and 2 [Cl]-1

Magnesium chloride is formed when magnesium ion formed from the loss of two electrons and two chloride ions formed by accepting one electron each are held together by electrostatic attractive forces.

Magnesium chloride is an ionic compound which consists of magnesium ions and chloride ions.

Therefore, magnesium chloride is formed when magnesium ion formed from the loss of two electrons and two chloride ions formed by accepting one electron each are held together by electrostatic attractive forces.

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The greenhouse gas among the following list of gases is a. Carbon Dioxide. Carbon dioxide (CO2) is a greenhouse gas. It is produced by burning fossil fuels (coal, oil, and natural gas) for energy. I

It is also produced by the decomposition of organic matter and other chemical reactions. Carbon dioxide, methane, and nitrous oxide are the three primary greenhouse gases. Carbon dioxide is the most important greenhouse gas among them. Other greenhouse gases include water vapor, ozone, and some industrial gases.The term "greenhouse gas" refers to any gas that traps heat in the atmosphere. These gases contribute to global warming by allowing sunlight to enter the atmosphere but preventing the heat that is generated from leaving it. As a result, the Earth's temperature rises, resulting in climate change.

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The specific measurement that will be affected is the volume of gas collected in the graduated cylinder. Since not all the gas was caught, the volume measured will be less than the actual volume of gas released. This will not change the molar mass calculation.

The molar mass is calculated by using the mass of the gas and the volume of the gas collected. Even though the volume measured was less than the actual volume, the mass of the gas collected should still be accurate. Therefore, the molar mass calculation should not be affected.
Hi! I'm happy to help with your question.

a. The specific measurement that will be affected is the volume of gas collected in the graduated cylinder.

b. This mistake will likely result in a decrease in the calculated molar mass. Since the volume of gas collected is lower than it should be, the molar mass calculation will be based on a smaller amount of gas, leading to a lower value than the actual molar mass.

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The hydrolysis of sucrose is extremely slow in an aqueous solution that can be increased by catalysts.

The sucrase-sucrose complex is produced as an intermediate in a separate reaction pathway with a lower activation energy through which the process progresses.

By offering a new reaction pathway with lower activation energy, catalysts can speed up a reaction. The diagram is consistent with a two-step mechanism in which the sucrase-sucrose complex is created in the first stage as an intermediate and depleted in the second.

An equimolar mixture of fructose and glucose is produced during the hydrolysis of sucrose, which is known as inverted sugar in the food industry.

Inversion is the process of hydrolyzing sucrose to produce glucose and fructose. Invert sugar is the result of the hydrolysis of sucrose, which causes the sign of rotation to shift from dextro (+) to laevo (-).

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Sucralose is present in the sample at a mass percent of 97.35 % and vitamin C at 2.65%

We can calculate the moles from osmotic pressure formula

Π = iMRT (Osmotic pressure) 

Van't Hoff factor i = 1

moles/volume = M

Now,

ππ= inVRT ——> (1)

R = 0.0821 L.atm.K.mol⁻¹

T = 301K

Volume = 28 ml, or 0.028 liters.

Next, using equation (1)

n = (π × 0.028 L) / (1× 0.0821 L.atmK⁻¹mol⁻¹× 301 K)

Mole = 0.00356 moles.

Given the quantity of samples and that sucralose has a mass of Y g and vitamin C has a mass of X g,

e = 1.371 g

X + Y = 1.371  g

Y = 1.371  g - X ----> (2)

The mass percent of vitamin c is 39.34 % and sucralose is 60.66 % in the sample.

Since vitamin C (VC) has a molecular mass of 176 g/mol while sucralose has a molecular weight of 398 g/mol. The sum of the moles of VC and sucralose is therefore the total amount of moles.

0.00356 moles = X/176 + (1.371 - X)/398

70,048(0.00356) = 398 X + 176(1.371 - X)

249.37 = 398 X +241.296 - 176 x

8.074 = 222x

X = 0.0364 gram (vit c)

Now, using eq (2);

Y =  1.371g - 0.0364 g

Y = 1.3346 gram (sucralose)

Thus, Vitamin C Mass Percentage is equal to 0.0364 g x 100 / 1.371g.

= 2.65%

Sucralose mass % =  1.3346g 100 / 1.371g

= 97.35 %

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Answer:

the sun is directly behind your head

Explanation:

The reason why we can see a rainbow is caused by sunlight and atmospheric conditions