the crude product can be purified by recrystallization. describe the key properties a solvent needs to be suitable for use in recrystallization.

The chemical formula of the gas is Xe

Molar mass of H2 (M₂) = 2 g/mol

Rate of diffusion of H2 (r₂) = ?

Rate of diffusion of X (r₁) = 0.124r₂

molar mass of X (M₁) = ?

To calculate the molar mass of X we use graham's law of diffusion

     [tex]\frac{r1}{r2} = \sqrt{\frac{M2}{M1} }[/tex]

    [tex]\frac{0.124r2}{r2} = \sqrt{\frac{2}{M1} }[/tex]

    [tex]{0.124} = \sqrt{\frac{2}{M1} }[/tex]

    0.015 = 2 / M₁

    M₁ = 2 / 0.015

    M₁ = 133.3

133 is near 131.293 g/mol, which is the molar mass of xenon (Xe)

Therefore the chemical formula of the gas HX is Xe.

Complete question:

A gas made up of atoms escapes through a pinhole 0.124 times as fast as H2 gas. write the chemical formula of the gas.

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The gram of nitric acid is 30.82 grams of HNO3.

The molar mass of nitric acid is derived from the atomic mass of the element and its corresponding quantity. Percent Yield is a calculation that compares the amount of product you are actually producing with the amount of product you were calculated to be producing.

Calculation:-

Percentage yield = 76%

mass of NO2 consumed = 45 g

percentage yield = observed/actual ×100

obtained mass = 75× 45÷100

= 135/4

=30.82 gram

All real laboratory reactions always produce slightly less product than calculated. The yield rate measures how close you can get. Theoretical yields are calculated based on the stoichiometry of the chemical formula. Actual yield is determined experimentally. The yield rate is determined by calculating the ratio of actual yield/theoretical yield. Percent yield is a calculated number that indicates the percentage difference between the theoretical yield and the actual yield of the experiment.

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He noticed that CO2 levels were rising almost annually at Mauna Loa. Keeling was able to link the usage of fossil fuels to this increase by looking at the CO2 levels in his sample data.

Since 1958, the amount of carbon dioxide (CO2) in the Earth's atmosphere has been plotted on a graph called the Keeling Curve. Dr. Charles David Keeling, who developed the Keeling Curve, is its namesake.

By collecting air samples and calculating the amount of CO2 they contained, Keeling started researching atmospheric carbon dioxide in 1956. He eventually picked up on a trend. Compared to samples taken during the day, the air samples taken at night had a greater concentration of CO2.

He used his knowledge of plant respiration and photosynthesis to explain this observation: plants absorb CO2 during the day to photosynthesize—or generate food for themselves—but release CO2 at night.

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For 1.00 mmol of hydrogen atoms, the difference in energy for the electron transfer from n = 3 to n = 2 is 1.82 102 kJ/mol 1.82 10 2 kJ/mol.

Scientists refer to energy as the ability to work. People have figured out how to transform converted from one object to the other and use it to accomplish tasks, making modern civilization possible. Energy can exist in many different forms, including electrical, physical, chemical, thermal, and nuclear, and it can also change its form.

Chemical, electric, optical, mechanical, heat, and nuclear energy are the six fundamental forms of energy. Different research may focus on other forms, such as electrical, acoustic, electromagnetic, and others.

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This structure is correct due to the total number of bonds and electrons

We employ the octet rule, which states that all atoms in a compound are expected to follow, to check the accuracy of any chemical structure. The octet rule is precisely satisfied for each atom in the depicted structure of carbon IV oxide. The valence shell of each atom in the molecule is surrounded by eight electrons. We may thus infer that this structure is accurate given the total number of bonds and electrons since CO2 has sixteen valence electrons.

It possesses a negative charge of 1.602176634 coulombs, the basic unit of electric charge, which is comparable to its negative charge. The rest mass of an electron is 9.1093837015 10^-31 kg, or just 1/1,836 the mass of a proton. An electron is therefore considered to have practically negligible mass in comparison to a proton or neutron, and its matter is not taken into consideration when calculating an atom's mass number.

The question is incomplete, the complete question is found in the image attached to this answer

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Ammonium bisulfide, NH4HS , forms ammonia, NH3 , and hydrogen sulfide, H2S , through the reaction NH4HS(s)⇄NH3(g)+ H2S(g) .This reaction has a Kp value of 0.120 at 25°C .

Temperature = 25 °C = 298 K

Volume = 5 L

Mass of H2S = 0.30 g

Moles of H2S = 0.30 / 34.08

= 0.0088

Using PV = nRT

H2S initial pressure = 0.0088× 0.0821/298/5

= 0.043 atm

Kp = 0.120

(a). NH4HS(s) ⇄ NH3(g) + H2S(g)

Equilibrium,  x=  0.043 + x

Kp = P(NH3) × P(H2S)

0.120 = x (0.043 + x)

x = 0.325 atm

Hence, at equilibrium:

Partial pressure of NH3 = 0.325 atm

Partial pressure of H2S = 0.043 + 0.325 = 0.368 atm

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Atoms are there in 3.34 moles of sodium 1.960

An atom is the basic building block of chemistry and it is the smallest unit into which matter can be divided without the release of electrically charged particles and sodium atoms and sodium ions have same number of protons

Here given data is

3.34 moles of sodium

So we have to find atom = ?

Atom = 3.34 moles × 6.022×10²³

Atom = 1.960

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Answer:

B

Explanation:

because I've just guessed and you've seen this but when you get this wrong and you see you'll wish you put that down

Answer:yes it 4

Explanation:

because u can divide

The balanced equation for lithium phosphate reacting with magnesium chloride can be written as 2MgCl2 + 2LiPO4 -------> 6LiCl + Mg3(PO4)2

What is a balanced equation?

The balanced equation is an equation in which the number of  atoms are same on both product and reactant sides. The number of moles of the reactants and products in any reaction can be calculated by looking at the balanced equation.

The balanced equation of lithium phosphate and magnesium chloride contains 2 moles of magnesium chloride reacting with 2 moles of lithium phosphate to give 6 moles of lithium chloride and 1 mole of magnesium phosphate.

Therefore, the balanced equation of lithium phosphate and magnesium chloride can be written as 2MgCl2 + 2LiPO4 -------> 6LiCl + Mg3(PO4)2.

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The skateboarder will have the most kinetic energy at point X and Y.

The energy an object possesses as a result of its motion is known as kinetic energy. With a decrease in object speed, the kinetic energy drops.

K.E = ¹/₂mv²

The skateboard will be moving at its fastest at points X and Y in the following diagram. Speed and kinetic energy are inversely correlated.

The skateboarder will therefore have the greatest kinetic energy at points X and Y, we can deduce.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.

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Answer:

X and Y

Explanation:

Edge said so

Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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Atomic elements with the same proton number are called isotopes. Ru will have an atomic number of 44 and a mass of 100.9 according to the periodic table.

The number of protons in an atom's nucleus is indicated by its atomic number. The total number of protons and neutrons in an atom makes up the atomic mass.

The atomic number, which is the total amount of protons for a certain element throughout all locations or planets, is constant. Ruthenium will therefore have an atomic number of 44.

The relative abundance determines the atomic mass, which is determined as follows:

Atomic mass = [tex]\sum[/tex] (relative abundance × atomic mass) of each isotope

Atomic mass = (96% × 100.91) +(4% × 101.90)

Atomic mass = 100.9%

Ru's atomic mass is therefore 100.9 and its atomic number is 44.

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The reaction rate would increase.

In an acidic media, the reaction between potassium iodate and sodium meta-bisulfite produces iodine. Firstly, hydrogen sulfite and iodate ions are formed. Iodide ions are produced as a result of the reaction between iodate ions and hydrogen sulfite ions. Iodine is formed when the excess of iodate ions reacts with iodide ions in the existence of hydrogen ions. Iodine instantly combines with any remaining hydrogen sulfite ions to make iodide ions before it can mix with starch to form a dark blue-colored complex. The iodine is then free to combine with the starch to create the colorful complex after all of the hydrogen sulfite ions have completed their reactions. The color reveals the consumption of the sulfite ions. In order to observe this reaction, a known but constrained amount of sodium meta-bisulfite solution and starch solution can be added. The amount of time it takes for the blue color to develop is used to measure the rate of reaction. Overuse of bisulfite will stop the development of the dark blue complex.

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The volume of hydrogen gas generated by the reaction of 2.00 grams of zinc with an excess of hydrochloric acid is 0.690 liters.

Zn (s) + 2HCl ZnCl2 H2 (g)

Zinc = 2/65 moles, or 0.0377 mol.

One mole of zinc produces one mole of hydrogen gas, according to the reaction.

0.03077 mole of zinc will thus result in: The amount of hydrogen gas is equal to 1/1×0.03077 mol.

hydrogen gas pressure, P=1 atm

hydrogen gas temperature, T=273.15 K

hydrogen gas volume = V =?

Hydrogen gas moles equal 0.03077 mol.

PV = nRT (Ideal gas equation )

V=nRT/P V=0.03077×0.0821atm L/molK×273.15/1atm

V = 0.690 L

The volume of hydrogen gas generated by the reaction of 2.00 grams of zinc with an excess of hydrochloric acid is 0.690 liters.

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When a chemical reaction is reversible, the reactants from the initial reaction are created from the products as soon as they are formed.

There is no net change in the amounts of the substances involved because, at equilibrium, the two opposing reactions proceed at equal rates.

When both the conversion of reactants into products and the conversion of products back into reactants take place at the same time, the reaction is said to be reversible. A and B may combine to generate C and D, or in the opposite reaction, C and D may combine to create A and B. In thermodynamics, this is different from a reversible process.

All physical changes that result in a state change can be undone.

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5ml of HCl is needed to convert a 2M molarity solution into a 0.1M solution of HCl that is 100ml in volume.

The HCl solution has a fixed molarity of 2M, and 100ml of a 0.1M molecular-weight solution is required for preparation. It is now necessary to determine the volume that will be required to make the 100ml 0.1M solutions.

M₁V₁  = M₂V₂

It is the dilution formula that should be used to achieve this.

We obtain,

2 x V₁ = 0.1 x 100 by entering the supplied values into the dilution formula.

2V1 = 10 V1

 V₁ = 10/2

V₁  = 5ml

As a result, 5ml of HCl is needed to make 100ml of a 0.1M solution.

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Answer: More Energy

Explanation:

Electrons at higher energy levels, which are farther from the nucleus, have more energy. They also have more orbitals and greater possible numbers of electrons. 

The spectrometer is always re-calibrated to zero to make sure that the absorbance measure is purely of the sample itself.

Spectroscopy is a general term used for the instrumental processes by which we can get the information about molecular structure through the careful analysis of the absorption, scattering, or emission of electromagnetic radiation by compounds.

Some of the applications of mass spectrometry include drug testing, food contamination detection, pesticide residue analysis, isotope ratio determination, protein identification, and carbon dating.

So considering the above question we usually  blank the spectrophotometer before taking any measurements because this makes sures that the absorbance measured in the samples is purely only to the sample material and not the components of the solution the sample is suspended in or the cuvette. We also make sure to wipe the sides of the cuvette.

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To ensure that the absorbance measurement is purely of the sample, the spectrometer is always re-calibrated to zero.

A spectrometer is a scientific instrument for separating and measuring the spectral components of a physical phenomenon. Spectrometer is a broad term that often refers to instruments that measure a continuous variable of a phenomenon in which the spectral components are mixed in some way. A spectrometer, in the broadest sense, is any instrument used to measure the variation of a physical characteristic over a given range, i.e. a spectrum.

Other types of spectrometers include mass spectrometers and nuclear magnetic resonance (NMR) spectrometers, but unless otherwise specified, the term 'spectrometer' refers to optical devices (and similarly, 'spectroscopy' refers to optical spectroscopy).

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The unknown volume to be added is 398.374 mL

Dilution formula

M₁ x V₁ = M₂ x V₂

M₁ = the initial concentration

M₂ = the concentration to be created

V₁ = the required volume

V₂ =  is the volume to be created

Volume units in liters. But, you can also use milliliters or something else, which is important on the left and right.

First, calculate the volume required

M₁ × V₁ = M₂ × V₂

1.75 M × 500 mL = 8.61 M × V₂

V₂ = 101.626 mL

So, the added volume is

500 mL - 101.626 mL = 398.374 mL

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Lake turnover process would most likely increase the dissolved oxygen level in a freshwater lake. Correct answer: letter B.

Since, it helps to improve water quality and circulation.

Renewal activities such as:

Can all help to increase the amount of oxygen in the water.

Adding vegetation to the lake can also help to increase oxygen levels by providing a place for aquatic organisms to live and produce oxygen through photosynthesis. Additionally, removing excess nutrients from the water can help reduce algae growth which can reduce the amount of oxygen available for other organisms.

Which process would most likely increase the dissolved oxygen level in a freshwater lake?

A. Algae bloom

B. Lake turnover

C. Photosynthesis

D. Respiration

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Electron and molecular geometries, respectively, for hydrogen sulfide H₂S is electron geometry is linear and molecular geometry is bent

Molecular geometry is the three dimensional arrangement of atom that constitute a molecule and there are two lone pair present on the sulfur central atom in the H₂S molecule hence it will contract the bond pair and this make its shape appear like a bent structure and therefore the molecular geometry or shape of H₂S is bent while its electron geometry is tetrahedral because of four electron group around the sulfur

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Breathing apparatus filters out harmful particles, vapors, or gases by using filters attached to the masks being used is Air purifying respirator.

An air purifying respirator removes the gases, gases vapors, combination of contaminants from the air. There are two types of respirator first which removes the dust and harmful substances and the other is which removes the vapors and gases. there are many benefits of using the air purifier. like related to our lungs , asthma. by filtering out fine particles

Thus, Breathing apparatus filters out harmful particles, vapors, or gases by using filters attached to the masks being used is Air purifying respirator.

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A homogeneous suspension is created by whisking or blending two immiscible liquids, such as oil and water, to create an emulsion.

Depending on how the emulsion is made, the agitation creates either tiny oil droplets or water/vinegar droplets. If the chemical make-up of a combination remains constant throughout, it is said to be homogeneous. The salt water in the sample described above is homogeneous because the dissolved salt is dispersed uniformly throughout the entire salt water sample. A mixture of oil and water is known as an emulsion. A mixture of two separate liquids is referred to as an emulsion.

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The frequency in hertz of electromagnetic radiation is 5.70×10^14 Hz.

c = wavelength × frequency

Here , wavelength= 530 nm = 530×10 m/s

Therefore,

3×10 m/s = 530×10 m/s× frequency

= Frequency= (3×10 m/s)÷(530×10 m/s)

= Frequency= 5.70×10^14 s-1

The frequency will be 5.70×10^14 Hz.

The number of periods or cycles per second is called frequency. The SI unit of frequency is hertz. An EMF meter can measure alternating electromagnetic fields normally emitted by man-made sources such as power lines.

Gauss meters or magnetometers, on the other hand, can measure DC fields that occur naturally in the Earth's magnetic field and radiate from other sources where direct current is present. Current. The energy associated with EM radiation is proportional to frequency and inversely proportional to wavelength. Therefore, the shorter the wavelength of the electromagnetic wave, the greater the energy.

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0.15 grams of paint chip contains 0.0394 grams of lead.

Since we working with percentages, let's assume that we start out with 100 grams of paint.

Then, we have 14.5 grams of PbCr2O7, lead (II) dichromate, and 73 grams of the paint evaporates,

leaving us with 27 grams of dried paint, from which we extract our 0.15-gram chip.

The molecular mass of PbCr2O7 is 423.2 grams, and the atomic mass of lead is 207.2 grams, so

18.5 grams of PbCr2O7 contains 207.2 * 14.5 / 423.2  =  7.099 grams of lead.

If a 26.4-gram "chip" of paint contains 7.099 grams of lead, then a 0.15-gram chip should contain

0.15*7.099 / 27  =  0.0394 grams of lead.

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The equipment that is  necessary for finding the volume of a regular solid is a graduated cylinder

A graduated cylinder is used to measure the volume of a solid by water displacement

The volume of water displaced will be equal to the volume of the solid to be measured

The graduated cylinders are long slender vessels that are used for measuring volumes and solids.

They are in a variety where there are those made of plastics and those made of glass they are also graduated as they have makings that aid in detecting the used  solution

They also vary in size from the largest to small this is because of the purpose which they are specified  to perform

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The water molecule interacts with various types of solutes to dissolve them , the water dissolves the ionic and the polar molecules but do not dissolves the non - polar molecules.

The water is called as universal solvent.  the polar molecule and the ionic molecule have the partial positive and the negative charges. the water molecule also have partial positive and the negative partial so they will attract and dissolve in water. Non - polar molecules do not have positive and negative charges therefore they will not attracted to water and do not dissolve in water.

Thus, The water molecule interacts with various types of solutes to dissolve them , the water dissolves the ionic and the polar molecules but do not dissolves the non - polar molecules.

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Net ionic equation of hydrochloric acid and lithium hydroxide is

H⁺ + OH⁻  →  H₂O

First, construct and balance the molecular equation, making sure that all of the formulas are accurate. Then, write the ionic equation, designating all of the components of water as ions. Continue with any coefficients. The net ionic equation should then be written after removing spectator ions.

Net Ionic Formulas Possess Value

Three powerful electrolytes are HCl, NaOH, and NaCl. Thus, even though we might write "HCl," we actually mean "H+ + Cl-," as they entirely breakdown into their ions in solution. Likewise, "NaCl" is "Na+ + Cl-," while "NaOH" is "Na+ + OH-."

Net ionic equation of hydrochloric acid and lithium hydroxide is

H⁺Cl⁻ (aq)+ Li⁺OH⁻(aq) → Li⁺OH⁻(aq) +H₂O(l)

H⁺ + Cl⁻ + Li⁺ + OH⁻ → Li⁺ + OH⁻ + H₂O

H⁺ + OH⁻  →  H₂O

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