Calculate the number of moles of NaCl contained in 5L of a 2.2M solution.

Answer:

670,385k

Explanation:

The volume that the oxygen gas will occupy at 32.2mL and 30°C is 21.57mL.

The volume of a gas can be calculated using the combined gas law as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

According to this question, a sample of oxygen gas occupies 32.2 mL at 30 °C and 452 torr.

452 × 32.2/303 = 452 × V/203

48.03 = 2.226V

V = 21.57mL

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The ground-state electron configurations of oxygen, sulfur, and selenium are 2-8-8, 2-8-6, and 2-8-8-6 respectively. Oxygen and selenium both have 8 electrons in their outermost shell, while sulfur has 6.

This difference affects the chemical and physical properties of these elements, as elements with more electrons in their outermost shells tend to be more reactive due to increased electron availability for bonding.

As oxygen and selenium have the same number of electrons in their outermost shell, they have similar chemical and physical properties. Sulfur, with its fewer outer shell electrons, has different chemical and physical properties than oxygen and selenium.

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Ne, Ar, and Kr share properties and the number of electrons in their outermost energy level because they belong to the same group (noble gases). Therefore, option A is correct.

Any of a class of rare gases with high stability and very low reaction rates, such as helium, neon, argon, krypton, xenon, and occasionally radon. also known as the inert gas.

Noble gases are low chemically reactive, odorless, colorless, nonflammable, and monotonic gases. Noble gases are exceedingly stable and unlikely to form chemical connections since they have the minimal inclination to receive or lose electrons. Hence, option A is correct.

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Using  hypothetical scenario, the Separation of  the Pennie’s are given below

Pennies dated after 1982 are lighter and thinner because zinc is less dense than copper. However, they have a similar diameter of 19.05mm to pennies dated before 1982. The difference in composition between the two groups is important because copper is a valuable metal, and the cost of producing a penny exceeded its value. By reducing the amount of copper in pennies, the U.S. Mint was able to save money on production costs.

Pennies dated before 1982 are made of 95% copper and 5% zinc and weigh 3.11 grams. They have a diameter of 19.05mm and a thickness of 1.55mm. Pennies dated after 1982 are made of 97.5% zinc and 2.5% copper and weigh 2.5 grams. They have a diameter of 19.05mm and a thickness of 1.52mm.

Therefore, the main difference between the two groups is their composition, weight, and thickness. The pennies dated before 1982 are larger, heavier, and thicker than those dated after 1982.

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Answer:

To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.

First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:

0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms

Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).

Explanation:

Answer:

D. The base isolation system prevents the building from coming into direct contact with the shaking ground.

Explanation:

During an earthquake, the ground moves rapidly and can cause significant damage to buildings and infrastructure. A base isolation system is a technique used to protect buildings and other structures from earthquake damage by reducing the amount of shaking they experience. The system involves isolating the building's foundation from the ground using flexible bearings, springs, or pads. This helps to decouple the building from the shaking ground and reduce the amount of energy that is transferred to the structure during an earthquake. By preventing direct contact between the building and the ground, the base isolation system can help to minimize damage to the building and improve its chances of survival during a seismic event.

Answer: D

Explanation: The base isolation system prevents the building from coming into direct contact with the shaking ground. RAHHHHHHHHH

the number of moles of EDTA required to titrate the water sample is 0.0000872 moles.

We can use the equation for molarity to calculate the number of moles of EDTA required to titrate the water sample:

Molarity = moles of solute / liters of solution

First, we need to calculate the number of liters of EDTA solution used in the titration:

19.840 mL = 19.840 mL x (1 L / 1000 mL) = 0.019840 L

Next, we can use the equation for molarity to solve for the number of moles of EDTA:

Molarity = 4.395x

[tex] {10}^{3} [/tex]

M

Liters of solution = 0.019840 L

moles of solute = Molarity x liters of solution

moles of EDTA = (4.395x

[tex] {10}^{ - 3} [/tex]

M) x (0.019840 L) = 8.720x

[tex] {10}^{ - 5} [/tex]

moles

Therefore, the number of moles of EDTA required to titrate the water sample is 8.720x

[tex] {10}^{ - 5} [/tex]

moles (or 0.0000872 moles) to three significant figures.

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Answer:

1. 1 mole of Cu to 2 moles of AgNO3

2. 1 mole of Cu to 2 moles of Ag

Explanation:

Cu + 2AgNO3 —-> Cu(NO3)2 + 2Ag

Cu = 1

Ag = 2

NO3 = 2

1. 1 mole of Cu to 2 moles of AgNO3

2. 1 mole of Cu to 2 moles of Ag

A pure substance is made up of only one type of particle as this is the reason for the denomination 'pure'.

The relative chemical composition of a pure substance is based on only one type of compound or element, which is thus the major determinant of a substance to be considered pure for a given solution.

Therefore, with this data, we can see that the relative chemical composition of a pure substance is based on the presence of one class of element.

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Answer:

A pure substance is made up of only one type of particle. These particles can be atoms, ions, or molecules, depending on the nature of the substance. In other words, a pure substance is homogeneous, meaning that it has the same composition and properties throughout its entire volume.

Answer:

Molarity is defined as the number of moles of solute per liter of solution. In this problem, we are given the number of moles of sugar and the volume of the solution in milliliters. We first need to convert the volume to liters before we can calculate the molarity.

To convert milliliters to liters, we divide by 1000:

908.08 milliliters = 908.08/1000 = 0.90808 liters

Now we can use the formula for molarity:

Molarity = moles of solute / liters of solution

Plugging in the given values, we get:

Molarity = 0.55 moles / 0.90808 liters

Molarity = 0.606 M (rounded to three significant figures)

Therefore, the molarity of the student's sugar solution is 0.606 M.

Answer:

The molarity of the student's sugar solution is 0.60 M.

Explanation:

If a person with type A blood (AO) is crossed with a person with type B blood (BO), the correct genotype percentage is 25% AB, 25% BO 25%AO, and 25% OO while the phenotypes are 25% A, 25% B, 25% AB and 25% O.

A punnet square in genetics is a useful diagram to estimate the phenotypes in offspring, in this case we have

      A    O

B   AB  BO

O  AO  OO

Therefore, with this data, we can see that the punnet square can be used to estimate phenotypes and thus determine the proportion of offspring.

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Explanation:

Refer to pic...........

Most experimental designs measures solely one or two variables at a time. Any different factor, which could probably impact the results, should be efficaciously controlled.

Controlling variables is important due to the fact mild variations in the experimental set-up ought to strongly have an effect on the result being measured.

Controlled variables are portions that a scientist needs to remain constant. If they had been altered, it would appreciably have an effect on the experiment's results. Most experiments have extra than one controlled variable.

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Explanation:

Refer to pic above........

To determine the mass of iron in 95.00 grammes of iron(II) chloride, we must first determine the compound's molecular formula.

The formula for iron(II) chloride is FeCl2.FeCl2 has the following molar mass:1 x 55.845 g/mol equals 55.845 g/mol 2 x 35.45 g/mol = 70.90 g/mol Cl FeCl2 molar mass = 55.845 + 70.90 = 126.745 g/mol

We can now use the molar mass of FeCl2 to calculate the number of moles of FeCl2 contained in 95.00 grammes of the compound: The number of moles equals the mass molar mass. FeCl2 molecular weight = 95.00 g 126.745 g/mol = 0.7492 mol

Because FeCl2 contains one iron atom per molecule, the sample contains 0.7492 mol of iron. Iron mass = number of moles of Fe molar mass of Fe Iron mass = 0.7492 mol 55.845 g/mol = 41.96 g As a result, the iron mass in 95.00 grammes of iron(II) chloride is 41.96 grammes.

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Based on the photo provided, it appears to be a picture of the Earth as seen from space. Unfortunately, I cannot determine the phase of the Moon from this image alone as the Moon is not visible in the photo.

What are the phases of the moon ?

The phases of the Moon are the different appearances of the illuminated portion of the Moon as seen from Earth. There are eight commonly recognized phases of the Moon, which are:

New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon

Waning Gibbous, Third Quarter, Waning Crescent

The entire cycle of lunar phases takes approximately 29.5 days to complete, which is known as a lunar month.

Based on the photo provided, it appears to be a picture of the Earth as seen from space. Unfortunately, I cannot determine the phase of the Moon from this image alone as the Moon is not visible in the photo.

The phase of the Moon changes continuously over a period of approximately 29.5 days, so it would be necessary to have a separate photo of the Moon to determine its phase at the time the astronaut took this picture.

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The number of moles of aluminum chloride that forms when 81g of aluminium reacts is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, aluminium reacts with chlorine to produce aluminum chloride.

Based on the balanced equation, 2 moles of aluminum produces 2 moles of aluminium chloride.

81 g of aluminium is equivalent to 3 moles of aluminum

This means that 3 moles of aluminum chloride will be produced if 3 moles of aluminum reacts.

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Answer: As a result, when you add oil to a cup of water the two don't mix with each other. Because oil is less dense than water, it will always float on top of water, creating a surface layer of oil.

The condensed formula and IUPAC nomenclature for the chemical ethyl alcohol are [tex]C_{2} H_{6} O[/tex].

Condensed structural formulae, which conserve space and are easier and faster to type out, display the atoms' positions similarly to a structural formula but on a single line. When demonstrating how a group of atoms in a molecule are linked to a single atom, condensed structural formulae are also helpful.

The hydrogens (or other ions or groups) that are connected to the carbon atoms are immediately next to one another in condensed chemical formulations. The corners and endpoints of lines are assumed to have carbon atoms in line-angle formulae. As each carbon atom is connected to four hydrogen molecules in total, it is assumed that each one has four bonds.

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Balanced equation = CS₂ + O₂ = 2CO₂ + SO₂ . The reaction's mass and charge are in balance on both sides.

An equation for a chemical reaction that has the same total charge and number of atoms for both the reactants and the products is called a balanced equation. To put it another way, the reaction's mass and charge are in balance on both sides.

A balanced chemical equation is one in which the mass of the reactants and the mass of the products are both equal to the number of atoms of each element on both sides of the equation.

To comply with the law of conservation of mass, which states that "Total mass of all the products of the reaction in a chemical reaction is equal to the total mass of all the reactants," the chemical equation must be balanced.

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According to the observations, work of scientist uses evidence while work of an engineer uses a practical approach.

Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.

It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.

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The next full moon will occur around July 14, which is answer choice C.

The moon is a natural satellite of the Earth, meaning it is a celestial body that orbits the Earth. It is the fifth largest moon in the solar system and is the largest relative to the size of its host planet.

The moon is approximately one-quarter the size of the Earth and is the closest astronomical object to the Earth.

If the moon is half full on June 15, then we can determine the next full moon by adding approximately 29.5 days to June 15, which is the average length of time for the moon to complete a full cycle of phases.

So, the next full moon will occur around July 14, which is answer choice C.

Therefore, option C is the correct answer.

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Answer: Lebron

Explanation: James was here

Answer:

963.95

Explanation:

to go from moles to anything you multiply. so when going from moles to grams to take your moles and them multiply by the molar mass of the compound. the molar mass in this case is 148.3.

Answer: b

Explanation:

20.0g AlCl3/133.5715 g Alcl3 = .149732540 moles AlCl3

M=mol/L  = 0.149732540/0.500=0.30

133.4515 (molar mass for AlCl3 from periodic table)

Answer:the second answer is boiling point elevation

the third answer is two sugar cubes

Explanation:

The graph supports the following statement: The use of fluorinated gases has contributed to global warming.

What role do fluorinated gases play in global warming?

Fluorinated gases, also known as F-gases, are a class of man-made gases found in a variety of industrial and commercial applications such as refrigeration and air conditioning systems, electrical equipment, and aerosol sprays. They consist of hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulphur hexafluoride (SF6).

F-gases are potent greenhouse gases, meaning they have a high global warming potential (GWP), which is a measure of their ability to trap heat in the atmosphere. HFCs, for example, have a GWP thousands of times greater than carbon dioxide (CO2).

F-gases contribute to global warming by trapping heat and preventing it from escaping into space when they are released into the atmosphere. The greenhouse effect causes the Earth's temperature to rise, resulting in climate change.

F-gases, in addition to having a direct impact on global warming, can indirectly contribute to climate change by encouraging the use of energy-intensive technologies such as air conditioning and refrigeration systems. Increased energy demand may result in the use of fossil fuels, which increases greenhouse gas emissions and worsens global warming.

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Explanation:

Using mole-mole relationship

If 6 moles of HNO3 will give 2 moles of H20

That means,

1 mole of HNO3 will give 1/3 moles of H20

Therefore,

29 mole of HNO3 will give [(1/3) x 29] moles

= 29/3 moles

= 9.67 moles

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The periodic table, also known as the periodic table of elements, is set up so that scientists can rapidly determine an element's mass, number of electrons, electron configuration, and other distinctive molecular characteristics.

The chemical elements are arranged in rows and columns on what is known as the periodic table, or periodic chart of the (chemical) elements. It is frequently used in physics, chemistry, and other disciplines and is frequently regarded as a symbol of chemistry.

It is a visual representation of the periodic law, which asserts that the atomic numbers of chemical elements have a roughly periodic relationship with their characteristics. The table is split into four sections that are approximately rectangular in shape.

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Answer:

As-81 undergoes radioactive decay with a half-life of 33 seconds. This means that after 33 seconds, half of the original sample would have decayed, and after another 33 seconds, half of the remaining sample would have decayed, and so on.

To find the percent of the sample that remains un-decayed after 43.2 seconds, we can use the following formula:

percent remaining = (1/2)^(t/h) x 100%

where t is the time elapsed and h is the half-life.

Substituting the given values, we get:

percent remaining = (1/2)^(43.2/33) x 100%

percent remaining ≈ 23.2%

Therefore, about 23.2% of the As-81 sample remains un-decayed after 43.2 seconds.

Explanation: