When 177. g of alanine (C3H7NO2) are dissolved in 800.0 g of a certain mystery liquid X, the freezing point of the solution is 5.9 °C lower than the freezing point of pure X. On the other hand, when 177.0 g of potassium bromide are dissolved in the same mass of X, the freezing point of the solution is 7.2 °C lower than the freezing point of pure X. Calculate the van't Hoff factor for potassium bromide in X. Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits.

1. The rms speed of O₂ molecules at 427 K is 576.9 m/s

2. The rms speed of He atoms at 427 K is 1631.7 m/s

The rms speed of the various elements can be obtained as follow:

1. For O₂ molecules

rms speed = √(3RT / μ)

rms speed of O₂ molecules = √(3 × 8.314 × 427 / 0.032)

rms speed of O₂ molecules = 576.9 m/s

2. For He atoms

rms speed = √(3RT / μ)

rms speed of He atoms = √(3 × 8.314 × 427 / 0.004)

rms speed of He atoms = 1631.7 m/s

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The mass of gasoline in the full tank is 68.99 kilograms. Gasoline is a highly flammable and volatile liquid that can easily ignite if exposed to heat or a spark.

What is Gasoline?

Gasoline, also known as petrol, is a transparent, petroleum-derived liquid that is primarily used as a fuel in internal combustion engines. It is a mixture of hydrocarbons, typically containing 5 to 12 carbon atoms per molecule. Gasoline is refined from crude oil through a process of distillation, whereby the crude oil is heated and separated into its different components based on their boiling points.

First, we need to convert the volume of gasoline from gallons to milliliters:

1 gallon = 3.78541 liters

1 liter = 1000 milliliters

Therefore:

22.3 gallons x 3.78541 liters/gallon x 1000 milliliters/liter = 84,161.83 milliliters

Next, we can use the density of gasoline to find the mass of the gasoline:

0.8206 g/mL x 84,161.83 mL = 68,986.87 grams

68,986.87 grams / 1000 grams per kilogram = 68.99 kilograms (rounded to two decimal places)

Therefore, the mass of gasoline in the full tank is 68.99 kilograms.

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Answer : 69.3 kg

Explanation:

The moles of dichloromethane (CH₂Cl₂) formed on the complete reaction of 0.455 moles methane (CH₄) with excess carbon tetrachloride is 0.91 moles.

The balanced chemical reaction of equation is -

CH₄(g) + CCl₄(g) → 2 CH₂Cl₂(g)

We will check the balanced reaction and use the molar ratio to find moles of CH₂Cl₂ -

1 mole of CH₄ produces 2 moles of CH₂Cl₂

0.455 moles of CH₄ produces 2 x 0.455 moles of CH₂Cl₂

                                                   1

Moles of CH₂Cl₂ = 0.91 moles

Hence,

Moles of dichloromethane (CH₂Cl₂) formed is 0.91 moles.

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Potash alum, represented by the chemical formula KAl(SO4)2·12H2O, is a double salt because it consists of two different salts, potassium sulfate (K2SO4) and aluminum sulfate (Al2(SO4)3), combined together. It forms a unique crystalline structure with 12 water molecules incorporated in its composition.

Potash alum is a type of alum that is commonly used in dyeing and water purification applications. The chemical formula for alum is KAl(SO4)2·12H2O.

The term "double salt" refers to the fact that the compound is made up of two different types of ions that are combined together.
In the case of potash alum, the two different types of ions are potassium ions (K+) and aluminum ions (Al3+). These two ions are combined together in a 1:1 ratio to form a complex ion, KAl(SO4)2, which is then combined with 12 water molecules to form the final compound, KAl(SO4)2·12H2O.
The term "double salt" is used to describe this type of compound because it contains two different types of cations (positive ions) that are combined together to form a single crystal lattice structure.

The two different cations are held together by ionic bonds, which are relatively strong and help to give the compound its characteristic properties.
Potash alum is a particularly useful compound because it has a number of important properties that make it useful in a variety of applications.

For example, it is highly soluble in water, which makes it a good choice for use in water purification applications.

It is also relatively stable and non-toxic, which makes it safe to use in a variety of different settings.

Finally, it has a number of useful physical properties, such as its ability to form crystals that are highly reflective and have a characteristic octahedral shape.

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Answer:

37.25

Explanation:

\(P_1\) = Initial pressure = \(14.8\ \text{atm}\)

\(P_2\) = Final pressure = \(12.3\ \text{atm}\)

\(V_1\) = Initial volume = \(23.5\ \text{mL}\)

\(V_2\) = Final volume

\(T_1\) = Initial temperature = \(315\ \text{K}\)

\(T_2\) = Final temperature = \(415\ \text{K}\)

From ideal gas law we have

\(PV=nRT\)

\(\Rightarrow PV\propto \dfrac{1}{T}\)

So

\(\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow V_2=\dfrac{P_1V_1T_2}{T_1P_2}\\\Rightarrow V_2=\dfrac{14.8\times 23.5\times 415}{315\times 12.3}\\\Rightarrow V_2=37.25\ \text{mL}\)

The final volume is \(37.25\ \text{mL}\)

The kind of wave that is formed when a transverse wave and a longitudinal wave combine is surface wave.

A surface wave is a mechanical type of wave that propagates along the boundary between two different media.

When a mechanical wave travels at the interface between two media, a transverse wave and a longitudinal wave can combine to form a surface wave.

An example can be seen in ocean waves.

Thus, the kind of wave that is formed when a transverse wave and a longitudinal wave combine is surface wave.

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The volume of the unit cell of element X is approximately 1.785 × 10⁸ picometers cubed (pm³).

In a body-centered cubic unit cell, there are atoms at each of the eight corners of the cube, and one atom in the center of the cube. Each atom at the corner is shared by eight unit cells, while the atom at the center is contained within a single unit cell.

The distance from one corner of the cube to the opposite corner is equal to four times the radius of the atom (i.e. 4 × 151 pm = 604 pm), which is known as the body diagonal of the cube.

Therefore, the length of one side of the cube is given by:

a = (4/√3) × r

= (4/√3) × 151 pm

≈ 554.6 pm

The volume of the unit cell is then given by:

V = a³

= (554.6 pm)³

≈ 1.785 × 10⁸ pm³

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Answer:

The sun provides most of the energy on earth because it is the earth's (and the solar system's) greatest source of heat and light.

Explanation:

The process of photosynthesis in plants uses the energy from the sun and converts that energy to be used for plants.
The burning of fossil fuels produces greenhouse gases which trap the heat in our earth's atmosphere (causing global warming).

Simple atomic models called Bohr-Rutherford diagrams display how many electrons are present in each of an atom's outermost shells.

The Bohr theory only applies to organisms with a single electron. Three electrons make up the lithium atom. Hence, the lithium atom does not fit into Bohr's hypothesis.

Lithium is an air-reactive alkali metal that tarnishes quickly to a dull silvery-grey and finally black. It is a silvery-white to grey alkali metal with a metal-lic lustre when new. At 20 °C, it is the least dense and lightest metal of all the elements that are not gases, and it floats on water.

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Answer:

\(M_{acid}=0.075M\)

Explanation:

Hello!

In this case, since the reaction between NaOH and HNO3 is:

\(NaOH+HNO_3\rightarrow NaNO_3+H_2O\)

Whereas there is a 1:1 mole ratio between the acid and base, thus, we can write:

\(M_{acid}V_{acid}=M_{base}V_{base}\)

In such a way, solving for the concentration of the acid, HNO3, we obtain:

\(M_{acid}=\frac{M_{base}V_{base}}{V_{acid}}\)

Therefore, by plugging in we obtain:

\(M_{acid}=\frac{0.12L*0.2M}{0.32L}\\\\ M_{acid}=0.075M\)

Best regards!

Answer:

Explanation:

ye

A pure substance is a material made of only one type of particle.

What is pure substance?

A substance that has fixed in chemical composition throughout is called a pure substance such as water, air and nitrogen. The  pure substance doesn't have to be of a single element or compound. A pure substance consists only of one element for the or one compound. a mixture consists of two or more different substances, not chemically joined together.

Examples of pure substance include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and the  baking soda (sodium bicarbonate). Crystals, in general, are pure substances.

Elements are the pure substances that cannot be broken down into simpler substances by any physical or chemical means we know  as they have only one kind of atom at the  entire composition. Thus when gold is tjr broken down it still remains gold and hence is considered a pure substance is and an element.

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Answer:

The correct answer is - option 1. the molarity of H changes by one order of magnitude.

Explanation:

pH is dependent on the concentration of H+ not on the volume of H+ or the salt content.  The molarity of H+ changes by one order of magnitude with the change in pH of 1.0 unit that can be an increase or decrease in molar concentration by one order of magnitude or factor of 10.

Order of magnitude refers to the factor of ten or powers of ten. A change in the order is equal to the change of the exponent changes by ± 1

The ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)).

Aluminum (Al) typically has an atomic number of 13, which means it has 13 protons and 13 electrons in its neutral state. However, in the given ion, \(Al^{3+}\), the ion has lost three electrons, resulting in a +3 charge. This means that the ion now has 13 protons and only 10 electrons remaining, giving it a net positive charge of +3.

The atomic mass of aluminum is 26.98 atomic mass units (amu). The given ion has an atomic mass of 71 amu, which suggests that the ion has gained additional particles. In this case, the ion has also gained three neutrons, resulting in a higher atomic mass.

The total number of particles (protons, neutrons, and electrons) in the ion can be calculated by adding the number of protons (13) and the number of neutrons (3), which equals 16. Since the ion has a net charge of +3, it only contains 10 electrons.

In summary, the ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)), which has 13 protons, 10 electrons, and 3 neutrons.

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Answer:

8

Explanation:

Answer:

Answer:

Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept

Answer:  The correct answer is;

Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.

Explanation:  This answer has been confirmed correct.

Answer:

Copper is typically a solid and has a coppery, bronzy color. It is a metal and has a relatively high melting point. It has a strong luster and can conduct electricity.

Answer:

RESHAPE BY A FORCE.

Explanation:

1. It can be reshaped by a force. Physical property can be observed and measured without any changes in molecular composition.

2. A physical property is one that can be change without altering the identity of the substance. These set of properties is not concentration dependent they are use to describe matter. Example are: density, solubility, melting point and color and odor. For this case the second option seems to fit the description it can be reshape by force.

Answer:

It is a reversible esterification reaction.

Explanation:

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The thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production is an industrial production of nano-sized titanium dioxide (TiO2).

Thermodynamics is defined as the change in the energy of system that brings about work in that system.

The leaching of ilmenite which is a titanium-iron oxide mineral with HCl can lead to the production of titanium dioxide (TiO2).

The use of thermodynamics in this process controls the heat and energy of the leaching system leading to a better yield of final products.

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Ammonium sulfide nh4s is the name-formula pair that is incorrectly matched.

The formula is a fact or a rule that is expressed using mathematical symbols. Normally, three or more values are connected by an equal sign. When you know the value of one quantity, you may apply the formula to determine how much the other quantity is worth.

Following that, demand fell as households decided not to make purchases and instead made do about what they already had. When a result, formula producers would have to produce less as the market changed. Delays: Supply chain bottlenecks brought on by the epidemic continue to affect the production of baby formula. With the maker Abbott, delays brought on by the weather have also happened.

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Explanation:

Molality is the ratio of the amount of substance of a solute (in moles – n) to the mass in kilograms of the solvent (m).

The symbol for molality is usually W and it can be calculated by the following formula:

W = n/m

here, we need to calculate n of NaCl using the formula:

n = m/MM

where MM of NaCl is 58.5 g/mol

n = 120/58.5

n = 2.05 moles

W = 2.05/30

W = 0.068 mol/Kg

Answer: A) 0.068

Carbon contains four electrons in its outer shell

Answer:

If the reaction is zero order, the rate constant has exactly the same units as the rate of the reaction mol L-1 s -1.

If the reaction is first order, then the concentration of one reactant takes care of the units of concentration, thus the rate constant is simply given in units of reciprocal time, s-1.

If the reaction is second order, then two units of concentration are already present so the rate constant needs reciprocal time plus inverse units of concentration, L mol-1 s-1.

If the reaction is third order, the rate constant should have units of L2 mol-2 s-1.

For a first order reaction, the unit of the rate constant is  s^–1 while for  a second order reaction, the unit of the rate constant is M∙s^–1.

The accurate order of reaction can only be determined from experimental values. We have the following orders of reactions;

For a first order reaction, the unit of the rate constant is  s^–1 while for  a second order reaction, the unit of the rate constant is M∙s^–1.

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Step 1 - Understanding the interaction of electrons and photons

Bohr's model of the atom states that the electrons are orbitating the nucleus in shells that are increasingly distant from the nucleus:

Light can be understood as being composed of small particles called photons. When photons collide with electrons, i.e., when we throw some light in a sample of a substance, the electron of a level can jump up to the next level. This is called light absorption.

When the electron reaches an upper level, it will not be there for a long time, since the atom becomes unstable. It will come back eventually. When it comes back, it gives the photon back, by emitting light. This is called light emission.

There are several ways an atom can emit light: we can throw UV light, for example, and receive blue light back. This is a special process that happens when an electron jumps, let's say, from level 1 to level 3. Then it comes back from level 3 to level 2 by not emiting light (it is also possible). Finally, it comes back from level 2 to level 1 by light emission. The resultant light, in this case, is less energetic than the light we had thrown at first. So we throw UV light (more energetic) and get blue light (less energetic).

Step 2 - Understanding light emission in fireworks

The whole process of light emission we just described does not really depend on light. It depends on making the electron jump further to an upper level. This can be done by:

1) Throwing light at a sample of the substance

2) Heating the substance

Heating a substance will work just as fine to get the electron moving. Once it gets to an upper level, it can come back by light emission as well, even though light was not involved in exciting the electron.

So in fireworks what happens is that a sample of a substance is heated, making its electrons jump to an upper level. When they come back, they give the energy back in the form of visible light (which our eyes and brain interpret as colours).

Answer:

2.38 x 10²⁵ molecules

Explanation:

To calculate the number of molecules in 39.6 moles of CO₂, we can use Avogadro's number, which is approximately 6.02 x 10²³ molecules per mole.

Therefore, the number of molecules in 39.6 moles of CO₂ would be:

39.6 moles x (6.02 x 10²³ molecules/mole) = 2.38 x 10²⁵ molecules of CO₂.

So, there are approximately 2.38 x 10²⁵ molecules of CO₂ in 39.6 moles of the compound.

The total pressure of the gases in the container is 1.000 atm at RTP.

To calculate the total pressure of the gases in the container, we need to use the ideal gas law, which states:

PV = nRT

where P is the pressure of the gas, V is the volume of the container, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

At RTP (standard temperature and pressure), the temperature is 273 K and the pressure is 1 atm. The volume of the container is not given, but since it is rigid, we can assume it is constant.

To find the total pressure, we need to first calculate the partial pressures of each gas using the mole fraction of each gas. The mole fraction is the fraction of the total moles of gas that are made up of each gas.

Let's assume that we have 100 moles of gas in the container. Then, we have:

20.0 moles of helium (20.0% of 100 moles)

20.0 moles of neon (20.0% of 100 moles)

60.0 moles of argon (60.0% of 100 moles)

The total moles of gas is then:

n = 20.0 moles + 20.0 moles + 60.0 moles = 100 moles

The mole fraction of helium is:

X(He) = n(He) / n = 20.0 moles / 100 moles = 0.200

The mole fraction of neon is:

X(Ne) = n(Ne) / n = 20.0 moles / 100 moles = 0.200

The mole fraction of argon is:

X(Ar) = n(Ar) / n = 60.0 moles / 100 moles = 0.600

The partial pressure of helium is:

P(He) = X(He) * P(total) = 0.200 * 1 atm = 0.200 atm

The partial pressure of neon is:

P(Ne) = X(Ne) * P(total) = 0.200 * 1 atm = 0.200 atm

The partial pressure of argon is:

P(Ar) = X(Ar) * P(total) = 0.600 * 1 atm = 0.600 atm

The total pressure is the sum of the partial pressures:

P(total) = P(He) + P(Ne) + P(Ar) = 0.200 atm + 0.200 atm + 0.600 atm = 1.000 atm

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Explanation:

A colloid is a heterogeneous mixture whose particle size is intermediate between those of a solution and a suspension. The dispersed particles are spread evenly throughout the dispersion medium, which can be a solid, liquid, or gas.

Answer:

It would be 6.9420. Thank me later