A saline solution has 1.9 grams of NaCI in 100 mL of solution. Calculate the molarity

Answer:

elastic materials like rubber have small k

Explanation:

is the change in length divided by the original length of the object.

Answer: An acid-base reaction is the transfer of a proton from a proton donor ... The reaction between a Brønsted-Lowry acid and water is called acid ionization.

Explanation:

The lattice energy of MX is 459.2 kJ/mol.

The lattice energy (ΔH° lattice) of an ionic compound is the energy released when one mole of the solid is formed from its constituent gaseous ions under standard conditions. The lattice energy is calculated using the Born-Haber cycle, which involves several steps including atomization, ionization, dissociation, and sublimation energies.

The lattice energy is related to the Coulombic attraction between the oppositely charged ions in the solid. To calculate the lattice energy for MX, we can use the following equation:

ΔH° lattice = ΔH° sub + ΔH° ion + ΔH° diss + ΔH° formation

where ΔH° sub is the sublimation energy of M(s), ΔH° ion is the first ionization energy of M(g), ΔH° diss is the dissociation energy of X2(g), and ΔH° formation is the enthalpy of formation of MX(s).

Using the given data, we can calculate each of these values and substitute them into the equation to obtain the lattice energy. The final answer should be in units of kJ/mol.

ΔH° sub (M) = 107.3 kJ/mol

ΔH° ion (M) = 577.5 kJ/mol

ΔH° diss (X2) = 242 kJ/mol

ΔH° formation (MX) = -467.6 kJ/mol

ΔH° lattice = 107.3 + 577.5 + 242 + (-467.6) = 459.2 kJ/mol

As a result, MX has a lattice energy of 459.2 kJ/mol.

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The new pressure in the cylinder of the car engine as the piston is moved to the top is 1062.55kPa

Boyle's law states that "volume of a given quantity of gas is inversely proportional to its pressure  as long as temperature remains constant.

It is expressed as;

P₁V₁ = P₂V₂

Given the data in the question;

To determine the new pressure as the piston is at the top of the cylinder, we substitute our given values into the expression above.

P₁V₁ = P₂V₂

P₂ = P₁V₁ / V₂

P₂ = ( 1.0067107atm × 0.6250L ) / 0.0600L

P₂ = 0.629194188Latm / 0.0600L

P₂ = 10.4865698atm

P₂ = 1062.55kPa

Therefore, the new pressure in the cylinder of the car engine as the piston is moved to the top is 1062.55kPa

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Answer:

When HCl (hydrochloric acid) and KOH (potassium hydroxide) are neutralized, they react to form water (H2O) and a salt (KCl). The balanced equation is:

HCl + KOH → KCl + H2O

In this reaction, one mole of HCl reacts with one mole of KOH to form one mole of water and one mole of KCl.

During titration of HCl with KOH, the point at which the reaction is complete is called the equivalence point. At the equivalence point, the moles of H+ ions and OH- ions are equal in the titration mixture.

Since one mole of HCl reacts with one mole of KOH, and H+ ions are present in HCl and OH- ions are present in KOH, the number of moles of H+ ions will be equal to the number of moles of OH- ions at the equivalence point.

Therefore, at the equivalence point, the number of moles of H+ ions will be equal to the number of moles of OH- ions in the titration mixture when HCl is exactly neutralized by KOH.

When the HCl is neutralized by KOH, the equivalence point is reached. During titration, the amount of HCl is determined using a basic solution of known concentration.

It is possible to calculate the amount of KOH required for complete neutralization if the initial concentration of the HCl solution is known. The balanced chemical equation for the reaction between HCl and KOH is:HCl + KOH → KCl + H2OThe stoichiometry of the reaction indicates that one mole of HCl reacts with one mole of KOH to produce one mole of H2O. Thus, the number of moles of H+ ions is equal to the number of moles of OH- ions when the equivalence point is reached.In an acid-base reaction, the number of moles of hydrogen ions (H+) produced by the acid is equal to the number of moles of hydroxide ions (OH-) produced by the base. When the HCl is exactly neutralized by the KOH, the number of moles of H+ ions is equal to the number of moles of OH- ions in the titration mixture.

This is due to the balanced chemical equation for the reaction, which shows that one mole of HCl reacts with one mole of KOH to produce one mole of water (H2O).Thus, at the equivalence point, the number of moles of H+ ions is equal to the number of moles of OH- ions. This is the point at which all of the HCl has reacted with the KOH. After the equivalence point, the excess KOH will react with the H2O to produce OH- ions, resulting in a basic solution.

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Answer : The moles of hydrogen gas will be, 201.9 moles

Solution :

First we have to calculate the molar mass of hydrogen gas.

using ideal gas equation,

where,

n = number of moles of gas

w = mass of gas

P = pressure of the gas = 1 atm

T = temperature of the gas =

M = molar mass of hydrogen gas = ?

R = gas constant = 0.0821 Latm/moleK

D = density of gas  = 0.090 g/L

Now put all the given values in the above equation, we get the molar mass of hydrogen gas.

Now we have to calculate the moles of hydrogen gas.

Therefore, the moles of hydrogen gas is, 201.9 moles

Explanation:

it is a parallel circuit.

hope this helps you.

Answer:

The mass of 1 mole LiOH has been 24 g. Thus, option D is correct.

The mass of a compound present in a mole of sample has been equivalent to the molar mass of the compound. The molar mass of the compound has been the sum of the constituent in a formula unit.

Explanation:

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Answer: 24 g

Explanation:

The required tubular length for 99.9% conversion is 116.84 meters.

On Earth, the rate at which cyclohexane reacts with benzene and methylcyclopentane is constrained by high mass transfer.

A tubular reactor with an internal diameter of 5 cm and a length of 20 m will be used to conduct the reaction, and cylindrical pellets with dimensions of 0.5 cm in diameter and 0.5 cm in length will be placed within the reactor's pipes.

Only the exterior surface of the pellets are coated.

The packed bed has a 40% porosity and a 60 dm3/min intake flow rate.

When the intake gas stream includes 5% cyclohexane and 95% hydrogen at 2 atm and 500°C, the tubular length vs. conversion graph should be drawn.

The graph may be used to identify the minimum length of tube necessary for 99.9% conversion.

For cyclohexane diffusion in hydrogen, the Fuller, Schettler, and Giddings Correlation is as follows:

a = 0.8854,

b = 1.764102,

C = 6.0231023.

The tube length vs. conversion graph may be displayed at 2 atm and 500°C when the incoming gas stream includes 5% cyclohexane and 95% hydrogen.

The following equation may be used to determine the rate of reaction:

ra=2.31011 exp[-88580/RT]C_A(1X)/3

The mole balancing equation for an isothermal tubular reactor is given as

dX/dL = -ra/C A,

where X is the conversion and L is the length.

To determine the length of the tubular reactor needed for a specific conversion X, we can integrate the aforementioned equation from X = 0 to X = X.

We must numerically calculate the following equation to obtain the necessary tube length for 99.9% conversion:

∫0.999L0−ra/CA 

dL=0.999XEq L 

for X=0.999

After rearranging the equation above, we get:

0.999L0ra/CA

dL=XX Eq

The aforementioned equation is integrated to give us

L = 116.84 m.

Therefore, the required tubular length for 99.9% conversion is 116.84 meters.

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The enthalpy change of the reaction C(diamond) → C(graphite) is -2.9 kJ.

The given information is ΔHrxn for the reaction C(diamond) → C(graphite) can be calculated with the given equations:Equations:  C(diamond) + O2(g) → CO2(g) ΔH = −395.4 kJ  2 CO2(g) → 2 CO(g) + O2(g) ΔH = 566.0 kJ  C(graphite) + O2(g) → CO2(g) ΔH = −393.5 kJ  2 CO(g) → C(graphite) + CO2(g) ΔH = −172.5 kJThe required reaction can be obtained by adding the equations (1) and (4), as follows:C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)Addition of the two equations (1) and (4) results in a reaction whose products are C(graphite) and CO2.

To get the final equation that involves only the required reactants and products, the equation (2) should be added, which consumes CO2 and produces O2, as shown below:C(diamond) + O2(g) → CO2(g)  ΔH = −395.4 kJ [eq. (1)]  2 CO(g) → C(graphite) + CO2(g)  ΔH = −172.5 kJ [eq. (4)]  2 CO2(g) → 2 CO(g) + O2(g)  ΔH = 566.0 kJ [eq. (2)]  C(diamond) + O2(g) + 2CO(g) → C(graphite) + 3CO2(g)  ΔHrxn=ΣΔHf(products)−ΣΔHf(reactants)  ΔHrxn=[(3 mol CO2)(-393.5 kJ/mol) + (1 mol C(graphite))(0 kJ/mol)] − [(1 mol C(diamond))(0 kJ/mol) + (1 mol O2)(0 kJ/mol) + (2 mol CO(g))(−172.5 kJ/mol)] − [(2 mol CO2)(566.0 kJ/mol)]  ΔHrxn=−2.9 kJ.

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Significant figures are as follows:

zero before (0.12 = 3 sig fig)

zero trapped (1.02 = 3 sig figs, or 0.012 = 3 sig figs)

zero on the end for whole number (120 = 2 sig figs)

zero on the end for decimal (1.20 = 3 sig figs)

Here are the first couple of answers:

1. 3

7. 2

13. 2

2. 2

8. 4

Answer:

c

Explanation:

The gas has an absolute pressure of 2.4 x 104.

From its starting state (P0V0) to its final state, two moles of an ideal monoatomic gas are expanded in accordance with the formula PT = constant, resulting in a pressure that is half that of the original pressure.

PV = nRT is the equation for an ideal gas. In this equation, P stands for the ideal gas's pressure, V for the ideal gas' volume, n for the total amount of the ideal gas expressed in moles, R for the universal gas constant, and T for temperature.

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Answer:

High pressure and low pressure have two distinct types of weather associated with them...typically. High pressure often means dry weather with sunshine. Low pressure often means clouds and precipitation. High pressure is associated with sinking air.

Explanation:

High-pressure systems are usually called Fair Weather Systems because the 7 types of weather in a high-pressure zone are generally comfortable and clear. Keep in mind that high and low pressures mean the air is under higher or lower pressure relative to the surrounding air.

Answer:

3 electrons more

explanation

minus sign in chemistry means more

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The mass of 4.35 moles of potassium chloride is 324.14 grams. Potassium chloride (KCl) is a chemical compound made up of potassium and chlorine.

Potassium chloride (KCl) is a chemical compound composed of potassium and chlorine. It is commonly used as a salt substitute for people on low-sodium diets, as well as a fertilizer, a source of potassium in food additives, and a component of some medical solutions. Potassium chloride can also be used in the production of various chemicals, including explosives and pharmaceuticals.

The molar mass of potassium chloride (KCl) is 74.55 g/mol (39.10 g/mol for K and 35.45 g/mol for Cl).

To calculate the mass of 4.35 moles of KCl, we can use the following formula:

mass = moles × molar mass

So, the mass of 4.35 moles of KCl is:

mass = 4.35 moles × 74.55 g/mol

mass = 324.14 g

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Answer:

Sodium (Na)

Explanation:

Answer:

B

Explanation:

Answer:

Explanation:

trust me

Answer:

Valparaiso is colder than Sydney.

Explanation:

At Valparaiso, the prevailing wind closer to the South Pole hits the continent (when a prevailing wind hits a continent, it has to alter in its direction to follow coastline).

Valparaiso's air temperature is cold

Sydney is warm  

^Warmer materials transfer energy to colder materials

To conclude everything stated, Valparaiso is colder than Sydney.

Valparaiso's air temperature is cold than Sydney

As Sydney and Valparaiso are located at the same distance from the equator and both are near to the ocean but then Valparaiso is colder than Sydney. At Valparaiso, the prevailing wind closer to the South Pole which hits the continent.

When a prevailing wind hits a continent, it has to alter in its direction to follow coastline so that's why Valparaiso's air temperature is cold than Sydney.

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Answer:

Column on the periodic table tell the number of valence electrons and the types of chemicals, such as metals, nonmetals, alkaline earth metals, metalloids, halogens, noble gases.

Explanation:

The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.

Use the following formula to obtain the ascorbic acid content in milligrams of a vitamin C tablet:

Mass of ascorbic acid (mg) = Volume of NaOH (mL) x Concentration of NaOH (mol/L) x Molar mass of ascorbic acid (g/mol) x 1000 / 1

We must first determine the molar mass of ascorbic acid:

Molar mass of ascorbic acid = (6 x atomic mass of carbon) + (8 x atomic mass of hydrogen) + (6 x atomic mass of oxygen)

= (6 x 12.01) + (8 x 1.01) + (6 x 16.00)

= 176.12 g/mol

Now we can substitute the values ​​in the formula into:

Mass of ascorbic acid (mg) = 20.74 mL x 0.201 mol/L x 176.12 g/mol x 1000 / 1

= 739.1 mg

Therefore, the amount of ascorbic acid in the Vitamin C tablet is 739.1 mg.

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Your question is incomplete, most probably the complete question is:

A vitamin C (ascorbic acid) tablet was dissolved in approximately 50 mL of distilled water and titrated with the standardized NaOH solution. From the results of this titration, the mg of ascorbic acid in the tablet was calculated. Molecular formula of ascorbic acid: C6H8O6 Volume of NaOH required to neutralize ascorbic acid in Vitamin C tablet (mL) 20.74 Concentration of NaOH in mol/L, 0.201 Calculate the amount of ascorbic acid in the Vitamin C tablet in (mg).

Dalton asserted the indivisible nature of atoms. The mass and chemical characteristics of all atoms of a specific element are the same.

Atoms of two different elements combine to form compounds: Dalton's atomic theory states that atoms of different elements can combine in different proportions to form compounds.

Atoms of an element are identical to atoms of other elements: Dalton's atomic theory states that atoms of the same element have the same properties and composition.

Every element is made of atoms: Dalton's atomic theory states that all elements are made up of atoms, which are the smallest indivisible particles of matter.

In a chemical reaction, some atoms disappear and new atoms appear: Dalton's atomic theory states that in a chemical reaction, atoms are neither created nor destroyed, but simply rearranged into new combinations.

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Answer:

when the atom moves to the third energy level, its energy increases. However, when it goes back to the second energy level its overall energy decreases.

Explanation:

the smallest (or innermost) energy level has the least amount of energy and the largest (or outer most) level needs the most amount of energy. In order for the electron to move from one level to the other, it would need to match the energy of that level.

Answer:

(D) Mitochondria.

Mitochondria is the cell organelle which breaks down food into energy which is released in the sell in the form of ATP molecules for the cell to use and it stores some of the proteins too.

The organelle in your cell breaks down food into molecules that the cell can use is:

d) Mitochondria

The organelle that breaks down food into molecules that the cell can use is the mitochondria. Mitochondria are often called the "powerhouses" of the cell because they are responsible for producing the cell's energy.

Mitochondria are found in all eukaryotic cells, which are cells that have a nucleus. They are not found in prokaryotic cells, which are cells that do not have a nucleus.

Mitochondria are made up of two membranes, an outer membrane and an inner membrane. The inner membrane is folded into cristae, which increase the surface area of the membrane. This allows more enzymes to be located on the membrane, which helps to increase the efficiency of energy production.

The mitochondria contain a number of enzymes that are involved in the process of cellular respiration. Cellular respiration is a series of chemical reactions that break down food molecules and produce energy in the form of ATP. ATP is the cell's main source of energy, and it is used to power all of the cell's activities.

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Filtration is the process of passing a liquid containing contaminants through a filter to get a cleaner liquid.

After filtration impurities are left on the filter when the liquid goes through it, resulting in a cleaner combination. The procedure of separating one ingredient from another in a compound is used in the purification of chemical compounds or any materials. A mixed sample is turned into fresh samples, each of which contains a single ingredient.Separation procedures are then utilised to separate these compounds. These techniques alter the relative proportions of components in a combination.The type of the compounds and the impurities in them influence the purification of organic chemicals and compounds.

Purification of compounds can be done in other methods as well such as distillation, chromatography, sublimation and crystallisation.

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Full question:

What can you conclude after learning about filtration of solutions of organic compounds? Name other methods of purification of compounds.

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Thus option C is correct option.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

Giant planet atmospheres have layers of clouds and aerosols (tiny liquid droplets) made from different chemicals because different chemicals condense at different temperatures.

Therefore,  option C is correct option.

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6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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