A sample of oxygen gas at 285 K exerts 3.21 atm of pressure on its 47.6 L container. How many moles of O2 are in the sample? The ideal gas constant is 0.0821 L*atm/mol*K. Round your answer to the nearest 0.01 and include correct units.

At a pressure of 939 mbar, the corresponding height of the mercury in the column of a mercury barometer is approximately 141.9 cm.

The height of the mercury column in a barometer is proportional to the atmospheric pressure. The proportionality constant depends on the density of mercury and the acceleration due to gravity. At standard conditions, the height of the mercury column in a barometer is about 760 mm.

To find the height of the mercury column at a pressure of 939 mbar, we can use the following proportion;

pressure / height = constant

The constant is the product of the density of mercury and the acceleration due to gravity, which we can take as 13,595 kg/m^3 * 9.81 m/s^2 = 133,322 Pa/m.

Substituting the given pressure and the constant, we get;

939 mbar / height = 133,322 Pa/m

Solving for height, we get;

height = 133,322 Pa/m / 939 mbar

= 141.9 cm

Therefore, the height of the mercury in the column of a mercury barometer is 141.9 cm.

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5 pennies weight 14 to 13 grams

Braineist pls?

- Liyah

Answer:

Adenitis: Inflammation of a lymph gland. From the aden-, gland + -itis, inflammation.

Inflammation of the gland can be defined by the term adenitis. Thus, option c is correct.

Inflammation is the body's immune response to an infection or an injury. This causes the white blood cells (leukocytes) of the body to move to the affected area or the tissue and results in swelling and redness.

The hardening of the gland is defined by adenosclerosis, the benign tumor of the glands is referred to as adenoma, whereas, cancer of the glands is referred to as adenocarcinoma.

In the word, adenitis, aden- is used to refer to the glands, and -itis defines inflammation. Hence, adenitis is used to define the inflammation of the glandular region.

Therefore, option c. adenitis is referred to as inflammation of the glands.

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The element helium is considered smaller than hydrogen because of the increase in the number of shells in the periodic table.

A periodic table is an arrangement for the elements to better learn and understand the properties and elements and gives information about the number of shells and effective nuclear charges on the atom.

Helium is present at the right in the periodic table and from moving hydrogen to helium the number of orbitals or inner shells increases which also increases the effective nuclear charge and size becomes small.

Therefore,  because of the increase in the number of shells in the periodic table.The element helium is considered smaller than hydrogen.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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The amount of the ethyl chloride is  7.8 * 10^-4 M.

A first order reaction is a type of chemical reaction in which the reaction rate is proportional to the concentration of only one reactant. The rate law for a first order reaction is given by the equation: rate = k[reactant]

Given that;

ln[A] = ln[A]o - kt

[A] = concentration at time t

[A]o = Initial concentration

k = Rate constant

t = time taken

Then;

k =ln[A] - ln [A]o/t

k = ln(0.00083 ) - ln(0.00100)/155

k = -(-7.1 - (-6.9)/155)

k = 6.45 * 10^-4

Then;

ln[A] =ln(0.00100) - (6.45 * 10^-4 * 400)

= -6.9 - 0.258

= -7.158

[A] = e^(-7.158)

= 7.8 * 10^-4 M

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From the calculation, there are 1.5 g of water produced in the reaction.

An equation shows the chemical transformation that takes place in a reaction vessel. In this case, the equation is; C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O.

Now;

Number of moles of glucose = 2.5g/180 g/mol = 0.014 moles

Since 1 mole of glucose produces 6 moles of water

0.014 moles of glucose produces 0.014 moles * 6 moles/ 1 mole

= 0.084 moles

Mass of water produced = 0.084 moles * 18 g/mol = 1.5 g of water

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Each species is a separate type of organism.

Therefore, Each species is not considered a group.

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Air escape from a tire when tire valve is opened because the pressure from the weight of the car is forcing the already pressurized air out .

When air is filled in tires, it get into more compact area than the outer atmosphere, therefore particles in tire are close to each other and exert pressure continuously on tire walls to get out of it. Thus, material of the tire need to be pressure resistant as much possible.

After opening the tire valve, air starts leaving with huge sound as strain outside the tire is weaker than that inside the tire. Molecules strike with the same force on larger area and pressure starts diminishing.

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Note: The question given on the portal is incomplete. Here is the complete question.

Question: Air leaves a tire when the tire valve is opened because

A. the pressure outside the tire is lower than the pressure inside the tire.

B. the pressure outside the tire is greater than the pressure inside the tire.

C. the temperature is higher outside the tire than inside the tire.

D. there are more gas particles outside the tire than inside the tire.

Answer:

Released

Explanation:

they convert into a form of energy that can be used by cells

Answer:

λ = 4.46 x 10⁻⁷ m = 446 nm

Explanation:

Applying Law of Conservation of Energy in this condition, we will get the following equation:

Total Energy of Combined Photons = Energy of 1st Photon + Energy of 2nd Photon

hc/λ = hc/λ₁ + hc/λ₂

hc/λ = hc(1/λ₁ + 1/λ₂)

1/λ = 1/λ₁ + 1/λ₂

where,

λ = wavelength of combined photon = ?

λ₁ = wavelength of 1st photon = 853 nm = 8.53 x 10⁻⁷ m

λ₂ = wavelength of 2nd photon = 935 nm = 9.35 x 10⁻⁷ m

Therefore,

1/λ = 1/(8.53 x 10⁻⁷ m) + (9.35 x 10⁻⁷ m)

1/λ = (0.1172 x 10⁷ m⁻¹) + (0.1069 x 10⁷ m)

1/λ = 0.2241 x 10⁷ m⁻¹

λ = 1/(0.2241 x 10⁷ m⁻¹)

λ = 4.46 x 10⁻⁷ m = 446 nm

Answer:

446

Explanation:

Answer:

A substance that can conduct electricity in solution

The statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected. That is option B.

Photoelectric effect is defined as the process by which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.

The photoelectric effect can also be defined as the ejection of electrons from a metal plate when light falls on it.

Therefore, statement that accurately describes the photoelectric effect is Shining a HIGH frequency light over a metal will cause ELECTRONS to be ejected.

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Answer:

Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.

Explanation:

Hope this helps :)

(didn't get this from the internet)

≈ 0,27 g/cm³

36.5 l = 36.5 dm³ = 36500 cm³

10 kg = 10000 g

d = m/V

= 10000g/36500cm³

≈ 0,27 g/cm³

Answer:

For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

Explanation:

I think this is it

Answer: B

Explanation:

Answer:

free

Explanation:

hi

Answer:

I think it in edmentum

Explanation:

The correct option for the catalyzed decomposition for given dinitrogen monoxide are- A. 1, 2, and 4

Nitrous oxide, also referred to as laughing gas, nitrous, simply nos, is a chemical substance that has the formula N2O and is also known as dinitrogen oxide as well as dinitrogen monoxide.

The fundamental procedures for dinitrogen monoxide's catalyzed breakdown are:

N2O (g) + NO (g) → N2 (g) + NO2 (g)

2 NO2 (g) → 2 NO (g) + O2 (g)

Thus, the correct statements are-

1. The overall balanced reaction is 2 N2O (g) → 2 N2 (g) + O2 (g).

2. NO (g) is a catalyst for the reaction.

4. NO2 (g) is a reaction intermediate.

Therefore, A. 1, 2, and 4 is the correct option.

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%Chlorine= Mass of organic compound

Mass of chlorine × 100 Chloral ( CCl 3CHO ) = 147.5106.5×100=72.20% Pyrene( CCl 4 )= 154142×100=92.20% Highest

Explanation:

Answer: Chloroform (CHCL3) has a lower percentage of Chlorine than CCL4 as:

Explanation:
Percentage of Chlorine in CCL4 is 93% whereas percentage of Chlorine in CHCL3 is 35%

Hope this helps.

Answer:

Helper

Explanation:

is the expaltin of the explatin

We have the following chemical reaction:

• For this reaction increasing the temperature will shift the equilibrium to the left because it is an exothermic reaction (it releases heat).

• A change in pressure won't affect the equilibrium because the number of moles is the same on each side of the equation.

• Removing HI (the product) will shift the equilibrium to the left whereas adding it will shift it to the right.

• Removing I2 or H2 which are the reactants will shift the equilibrium to the left, whereas adding any of them will shift it to the right.

So, the correct answer is 2: I, VI and VII only.

Answer:

Longer bonds have lower attractive force

Answer:

Explanation:

0.25 moles KCl = 19g KCl (molar mass KCl = 74.6g)

The equation for the equilibrium constant (K) of the reaction studied in this exercise can be written as follows: K = ([\(CI_20\), 2-] * [\(H_20\)(1)]) / ([\(C0_4^ 2\)-] * [Ht])

In this equation, the concentrations of the species involved in the reaction are represented by the square brackets [ ]. The subscripts indicate the stoichiometric coefficients of each species in the balanced chemical equation.

The reaction being studied involves the following species:

\(C0_4^ 2\)- (ag) + 2Ht (ag) = \(CI_20\), 2- (ag) + \(H_20\)(1)

In the equilibrium constant expression, the concentration of \(CI_20\), 2- is multiplied by the concentration of \(H_20\)(1) and divided by the product of the concentrations of \(C0_4^ 2\)- and Ht. The stoichiometric coefficients in the balanced equation are used as exponents for the concentrations of the respective species.

It is important to note that the concentrations used in the equilibrium constant expression should be in molar units (mol/L) or expressed as partial pressures for gases.

Additionally, the equilibrium constant is specific to a given temperature, and its value provides information about the relative amounts of reactants and products at equilibrium.

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Answer:

1. Percentage yield is 64.75%

2. Atom economy is 48.39%

Explanation:

1. Determination of the percentage yield

Experimental yield = 24.8 g

Theoretical yield = 38.3 g

Percentage yield =?

Percentage yield = Experimental yield /Theoretical yield × 100

Percentage yield = 24.8 / 38.3 × Percentage yield = 2480 / 38.3

Percentage yield = 64.75%

2. Determination of the atom economy.

The balanced equation for the reaction is given below:

6CO₂ + 6H₂O —> C₆H₁₂O₆ + 6O₂

Next, we shall determine the mass of CO₂, H₂O and C₆H₁₂O₆ from the balanced equation.

Molar mass of CO₂ = 12 + (16×2)

= 12 + 32

= 44 g/mol

Mass of CO₂ from the balanced equation = 6 × 44 = 264 g

Molar mass of H₂O = (2×1) + 16

= 2 + 16

= 18 g/mol

Mass of H₂O from balanced equation = 6 × 18 = 108 g

Molar mass of C₆H₁₂O₆ = (6×12) + (12×1) + (6×16)

= 72 + 12 + 96

= 180 g/mol

Mass of C₆H₁₂O₆ from the balanced equation = 1 × 180 = 180 g

Next, we shall determine the total mass of the reactants. This is illustrated below:

Mass of CO₂ = 264 g

Mass of H₂O = 108 g

Total mass of reactants =?

Total mass of reactant = Mass of CO₂ + Mass of H₂O

Total mass of reactant = 264 + 108

Total mass of reactant = 372 g

Finally, we shall determine the atom economy. This can be obtained as follow:

Mass of desire atom (C₆H₁₂O₆) = 180 g

Total mass of reactants = 372 g

Atom economy =.?

Atom economy = mass of desire atom / total mass of reactant × 100

Atom economy = 180/372 × 100

Atom economy = 48.39%

The average atomic mass of the imaginary element : 47.255 amu

The elements in nature have several types of isotopes  

Isotopes are elements that have the same Atomic Number (Proton)  

Atomic mass is the average atomic mass of all its isotopes  

Mass atom X = mass isotope 1 . % + mass isotope 2.% ..

isotope E-47 47.011 amu, 87.34%

isotope E-48 48.008 amu, 6.895

isotope E-49 50.009 amu, 5.77%

The average atomic mass :

\(\tt avg~mass=0.8734\times 47.011+0.06895\times 48.008+0.0577\times 50.009\\\\avg~mass=41.059+3.310+2.886\\\\avg~mass=47.255~amu\)

Answer:

B.K2(OH)2 i think that is the answer