a rigid container holds 0.40 mol of gas at 280 k. the temperature of the gas is increased to 400 k. as the temperature increases some gas escapes through a small crack. how many moles remain?

Answer:

C - they will have equal number of molecules.

Explanation:

The number of molecules in 2 liters of hydrogen gas compare with the number of molecules in 2 liters of oxygen gas at the same temperature and pressure because while the equal volumes of the gases are at the same temperature and pressure, it still has the same number of molecules.

Answer:

Mg: 52.9%

Br: 47.1%

Explanation:

The atomic mass of an atom is a relative measure of its mass compared to other atoms.

An atom's mass is its atomic mass. Although the kilogram is the SI measure of mass, the unified atomic mass unit, or dalton, is a common way to express atomic mass. An unbound carbon-12 atom in its ground state has a mass of 112 of a Da.

Atomic mass is the amount of matter that makes up an element's atom. It is written as a multiple of 1.992646547 1023 gram, or one-twelfth of the mass of the carbon-12 atom, which is given an atomic mass of 12 units.

A fundamental physical quality of matter is mass. The term "atomic mass" refers to the weight of an atom or molecule.

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Answer:

25.91 L

Explanation:

P1V1= P2V2

748 (26.5) =  765 ( V2)      V2 = 25.91 LITERS  

The following equations to calculate the resolution, selectivity factor, and column length:

(a) Resolution = \(w_1 / (w_2 - w_1)\)

(b) Selectivity factor = \(w_1 / w_2\)

(c) Column length =\(L / (2 * pi * D / w_1)\)

(d) Time required = \(Q * L / (4 * pi * D^2 / w_1)\)

The resolution is defined as the ratio of the width of the peak for the two components to the difference in their retention times.

The selectivity factor (a) is defined as the ratio of the width of the peak for the two components to their retention times.

The length of the column (L) is the distance between the inlet and the outlet of the column.

The flow rate (Q) is the volume of the mobile phase that passes through the column per unit time.

We can start by finding the retention times of the two components, We can use the equation:

Ti = h/k

here h is the column height and k is the distribution coefficient of the component.

We can also find the width of the peak for each component, We can use the equation:

w = 2 * π * D / L

here D is the diameter of the column.

Next, we can use the following equations to calculate the resolution, selectivity factor, and column length:

(a) Resolution = \(w_1 / (w_2 - w_1)\)

(b) Selectivity factor = \(w_1 / w_2\)

(c) Column length =\(L / (2 * pi * D / w_1)\)

(d) Time required = \(Q * L / (4 * pi * D^2 / w_1)\)

We can substitute the values of the parameters we have found into these equations to solve for the values of the resolution, selectivity factor, and column length.  

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Answer:

35.45253819

Explanation:

(0.7578*34.96....)+(0.2422*36.96...)

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass of Chlorine is 35.45g.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

Substituting the given values

Average atomic mass=(0.7578×34.96....)+(0.2422×36.96...)

Average atomic mass=35.45g

Therefore, the average atomic mass is 35.45g.

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18.04g of sodium acetate must be added to 1.00L of a .200M acetic acid solution to form a buffer of 4.20.

The formula for sodium acetate (NaC2H3O2) is Na+ + C2H3O2-.

To calculate the amount of sodium acetate needed to form a buffer of 4.2, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([base]/[acid]) where [base] is the concentration of the base (sodium acetate) and [acid] is the concentration of the acid (acetic acid).

Given that the acetic acid concentration is 0.200 M,

we can solve for the concentration of sodium acetate needed to achieve a pH of 4.2 when pKa of acetic acid = 4.75 then:

4.2 = 4.75 + log([base]/0.200)

log([base]) = -0.55

[base] = 0.22 M

Now, we can calculate the amount of sodium acetate needed to achieve this concentration in 1.00 L of solution:

0.22 mol/L × 1.00 L = 0.22 mol

Then, we can convert this amount of moles to grams using the molar mass of sodium acetate.

Molar mass of sodium acetate = 82g/mole

Mass of sodium acetate required = 0.22 x 82 = 18.04g

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The chloroplast was not in need of glucose as itself manufactures and stores glucose during the process of photosynthesis.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

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The cat will be 367.72 centifingers tall.

1 finger = 3.1 inches

Recall that: centi =  \(10^-^2\)

Thus, 1 centifinger = \(10^-^2\) finger

The cat is 11.4 inches tall.

If 1 finger = 3.1 inches

Then, how many fingers will make 11.4 inches?

= 11.4 x 1/3.1 = 3.6772 fingers

3.6772 fingers = 3.6772 x  \(10^2\) centifinger

                          = 367.72 centifingers

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Answer:

The answer is C. Convection.

C Covention hope it help

The orange circle is the colored form that Gillian won't require for her version of the chain of electron transport.

Many physical processes, such as gravity, electrical interactions, weak interplay, electricity, magnets, chemistry, & thermal conductivity, depend on electrons.

A negatively charged particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of atoms within an atom is an electron that is bonded to it; the other two were protons and neutrons.

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Two other properties of the will that can be tested to investigate the alleged document forgery are the ink composition and the paper age.

1. Ink Composition: Forensic analysis can examine the ink used to write the will and compare it to the expected ink characteristics for the alleged time period when the document was created. Different ink formulations and chemical compositions are used in different time periods, and an inconsistency in the ink composition may indicate tampering or forgery.

2. Paper Age: Determining the age of the paper on which the will is written can also provide valuable insights. Paper can be analyzed using techniques such as carbon dating or examination of watermarks, manufacturing methods, and materials. If the determined age of the paper does not align with the alleged date of the will, it raises suspicions of forgery or document alteration.

By examining the ink composition and paper age, forensic experts can gather scientific evidence to support or refute the authenticity of the will. These additional properties add another layer of scrutiny and can provide critical information in investigating alleged document forgery.

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Answer:

Because it is the hottest zone

Answer:

the non luminous flames are very hot. little light is produced by non luminous flames.

Answer:

f=ma

so   a=f/m

a=16N/2kg

a=8m/\(s^{2}\)

Answer:

Four is the maximum number of single covalent bonds that can be formed by carbon. Carbon has four electrons in the valence shell.

Explanation:

Answer: come on man its not that hard

Explanation:

1.Iodine

I hope it help you

Answer:

Yes, it has only a single covalent bond.

Explanation:

It has only a pair of electrons between the iodine atoms in order to gain a stable arrangement of 8 electrons in its outer shell. It is sharing them, so it's a covalent bond as a single iodine atom cannot be stable on its own. It's a halogen and is a single covalently-bonded diatomic molecule.

Based on the cooling curve data above freezing temperature range for a mixture containing 83% lead and 17% tin is solid lead - in other words, the lead starts to freeze at 250°C and tin having freeze at 183°C.

The temperature will eventually fall to a level where it crosses the line into the following area of the diagram. At that point, the mixture will begin to form some solid lead, meaning that the lead begins to freeze but not the tin. Around 250°C is the temperature at which that occurs.

From the cooling curve, one can infer the typical liquidus and solidus temperatures for each alloy. The tin lead temperature equilibrium Phase Diagram can then be used to determine the corresponding compositions of each alloy using this liquidus temperature.

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The compound NO₂ is named nitrogen dioxide.

It is a covalent molecule composed of one nitrogen atom and two oxygen atoms that are double bonded to the nitrogen atom. Nitrogen dioxide is a reddish-brown gas with a sharp, pungent odor. It is an important air pollutant, often produced by combustion processes, and can have harmful effects on human health and the environment.

In addition to its role as a pollutant, nitrogen dioxide is also used in various industrial processes, such as the production of nitric acid and as a rocket propellant. The name "nitrogen dioxide" reflects the composition of the molecule and follows the rules of IUPAC nomenclature for covalent compounds.

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Answer:

Lawrencium (Lr)

Explanation:

The element with the given electron configuration is Lawrencium (Lr), which has an atomic number of 103.

The rate constant increase by the factor of 4 when temperature is increased from 25C to 37C and activation energy is 85.6KJ. This can be solved using Arrhenius equation.

What is Arrhenius equation?

Arrhenius equation explains the relation between temperature and rate of the reaction for many chemical and physical reactions. It is given by,

k = A x e^(-Ea/RT)

where k = rate of the reaction, Ea = activation energy, R = gas constant, T = temperature.

The increase in the rate of the reaction can be calculated by Arrhenius reaction when the 2 different temperatures are given.

log k2/k1 = Ea / 2.303R [T2-T1 / T2T1] = 85.6 / 2.303 x 8.314 [ 310 - 298 / 310 x 298] = 4.

Therefore, by using Arrhenius equation, the increase in the rate of the reaction when the temperature increased from 25C to 37C is by a factor of 4.

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When an air and fuel mixture has more gas than what is required for efficient combustion, a lean burn results.The ideal combustion ratio for burning propane entirely is 1 part propane (4%) to 24 parts air (96%).

If the area has a cold snap while your propane tank is much less than 20% full, you may run out of propane faster than you expect.If there isn't any propane, your house won't be warm.Without heat, your home is dangerous and uncomfortably cold.Additionally, it's possible for your pipes to freeze or explode.

Yes, they could, although this usually only applies to the portable, 20-lb grilling tanks, not the larger ones.A warm summer day can easily raise temperatures.Even as the portable propane tank warms up, the pressure will rise.

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One percent  of a human's DNA is used for coding Information for the synthesis of proteins.

DNA  is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Your question is incomplete, but most probably your full question was,approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?

5%

25%

99%

95%

1%

A mixture of 3.05-atm N₂(g) and 5.29-atm He(g) exerts a total pressure of 8.34 atm.

Dalton's law states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

A mixture of N₂(g) and He(g) exerts a total pressure of 8.34 atm, while the partial pressure of N₂ is 3.05 atm.

We will use Dalton's law to calculate the partial pressure of He.

P = pHe + pN₂

pHe = P - pHe = 8.34 atm - 3.05 atm = 5.29 atm

where,

A mixture of 3.05-atm N₂(g) and 5.29-atm He(g) exerts a total pressure of 8.34 atm.

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Answer:

Awnser: D,Newtons second law of motion

Answer:

A liquid

Explanation:

Liquids has an indefinite shape, which means it could change from one shape to another. For example, if you pour water into a rectangular fish tank. The shape of the liquid changes into a rectangle. Definite volume means its volume is consistent and that it is unchangeable. If you fill the rectangular fish tank with water, the volume of the water stays the same even though it changes shape.

Hope this helps.

Answer:

Explanation:

1. To identify what's been oxidised and what's been reduced in a redox reaction

2. In naming compounds

3. To work out reacting proportions in titration reactions

Answer:

1 - Evaporation

2 - Evapotranspiration

3 - Condensation

4 - precipitation

5 -  River Discharge

6 - Infiltration

Explanation:

I hope I'm right. Good luck.

Without the specific redox reaction, we cannot determine the element being oxidized.

In the given redox reaction, we need to determine which element is being oxidized. To do this, we compare the oxidation states of the elements before and after the reaction.

Unfortunately, the specific redox reaction is not provided in the question. Without the reaction, we cannot determine the element being oxidized. Please provide the specific redox reaction so that we can analyze it and identify the element being oxidized.

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