If 8.05 moles of an ideal gas has a pressure of 2.06 atm and a volume of 27.83 L, what is the temperature of the sample

Answer:yes

Explanation:depending on the chemical properties and amount of the chemical and the state of matter and amount of mass

A phase diagram of water estimate the boiling point of water at a pressure of 50 kpa.

The degree at which a substance's liquid and solid phases are in equilibrium is known as its melting point. The temperature at which a substance's vapor pressure of the liquid equals the atmospheric pressure is known as the boiling point of that material.

The boiling point of organic materials can reveal crucial details about their structural makeup and physical characteristics. A chemical can be identified and described using its boiling point. Water is boiling more quickly at higher atmospheric pressure that it does at lower atmospheric pressure.

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Answer:

Explanation:

Fossil fuels got their name because they are made from dead organisms, mostly plants that didn't decay because they were squashed under water or mud with no oxygen.

Answer:

blue react with bases to create a neutral solution

Explanation:

A strong acid will react with a strong base to form a neutral (pH = 7) solution.

The concentration of Fe₃+ will be 0.275 M and the concentration of I- will be 0.825 M.

The concentration of the solution can be calculated as shown below.

Molarity = moles/Volume

Substitute the respective values in the above equation.

Molarity = 0.200 mol / 0.725 L

Molarity = 0.275 M

The dissociation of FeI3 is shown below.

\(FeI_3 -- > Fe^3^++ 3I^-\)

So, according to the equation, one mole of FeI₃ gives one mole of Fe³⁺ and one mole of I-.

0.275 M  FeI³ gives 0.275 M Fe3+ and 0.275 M × 3 I- = 0.825 M

Therefore, the concentration of Fe3+ will be 0.275 M, and the concentration of I- will be 0.825 M.

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Answer:

1656.12grams

Explanation:

To calculate the mass of a substance in a particle, we need to calculate the number of moles (n).

n = nA × 6.02 × 10^23

nA = 8.98 x 10^24 particles

number of moles = 8.98 x 10^24 ÷ 6.02 × 10^23

n = 8.98/6.02 × 10^ (24 - 23)

n = 1.492 × 10^1

n = 14.92moles of CaCl2

Molar Mass of CaCl2 where Ca = 40g/mol, Cl = 35.5g/mol

CaCl2 = 40 + 35.5(2)

= 40 + 71

= 111g/mol

Using mole = mass/molar mass

mass = molar mass × mole

mass = 111 × 14.92

mass = 1656.12grams.

Answer:

Oxygen is one of the most abundant elements on Earth. Oxygen accounts for 20.9% of the atmosphere, 45% of the Earth's crust (as oxide minerals) and also accounts for almost all of the mass of water on Earth (89%). It is found in a huge number of natural minerals including sulfates, phosphates, carbonates and oxides.

Explanation:

Hope this helps

Answer:

a new substance is produced

Explanation:

i just took my test and got this question right

The best evidence that a chemical reaction occurs when coal burns is a new substance is produced. The correct option is A.

Coal is a carbon containing fossil fuel, which is formed when the organic matter is decomposed inside the earth with heat and pressure by the earth crust. It is the most used fossil fuel.

Carbon dioxide is a gas produce when these fossils fuel burned. It is a green house gas and increase the warmth of the earth when produced. It is taken by plants to make their food.

When coal burns, it produces carbon dioxide which is a gas and coal is a solid, so here the chemical reaction is happening which is producing a new substance.

Thus, the correct option is A. A new substance is produced.

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The repeating monomer unit of polyglycine is simply the amino acid glycine. The chemical structure of glycine is:

H

|

H2N — C — COOH

|

H

The polymerization of glycine involves the condensation of the amino group (-NH2) of one glycine molecule with the carboxyl group (-COOH) of another glycine molecule, releasing a molecule of water (H2O) in the process. The resulting bond is called a peptide bond, and it connects the carbon atom of one glycine molecule to the nitrogen atom of the other glycine molecule.

The repeating monomer unit of polyglycine can be represented as:

H          H          H

|          |          |

H2N — C — CO — NH — C — CO — NH — C — COOH

|                               |

H                               H

Note that the NH group on the left side of the monomer unit represents the amino group of one glycine molecule, and the CO group on the right side represents the carboxyl group of the other glycine molecule. This pattern repeats indefinitely to form the polyglycine polymer.

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The molar mass of the unknown nonelectrolyte compound is

Using the formula;

∆T = K m i

Where;

K = freezing point depression constant

m = molality of the solution

i = Van't Hoft factor

Note that i = 1 since the compound is a nonelectrolyte.

To find molality;

Number of moles = 0.520 g/Molar mass

Let the molar mass of the unknown compound be MM

Number of moles = 0.520 g/MM

Number of kilograms of solvent = 4.12 g/1000 = 0.00412 Kg

Molality = 0.520 g/MM * 1/0.00412 Kg

Freezing point depression is 4.20 °C

To find the molar mass of the compound;

4.20 °C = 3.90 °C/m *  0.520 g/MM * 1/0.00412 Kg

4.20  = 492.23/MM

MM = 492.23/4.20

MM = 117.19 g/mol

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Answer:

Gems are natural material, metals are man-made materials!

Explanation:

Minerals occur naturally in the earth's crust and are defined as inorganic solids that have characteristic chemical composition and crystalline structures. ... A gemstone or gem is a piece of mineral crystal, which, in cut and polished form, is used to make jewelry or other adornments.

The explanation regarding the gems contains the various properties as compared to the metals should be described below:

In this way, it should be explained.

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The products formed in the acid-base reaction between KOH (potassium hydroxide) and HBr (hydrogen bromide) are potassium bromide (KBr) and water (H2O).

What is Conjugate Base?

A conjugate base is the species that remains after an acid has donated or lost a proton (H+) during a chemical reaction. In other words, it is the species that is formed when an acid loses a hydrogen ion (H+) from its chemical formula.

The products of this reaction, KBr and H2O, are examples of a salt and a neutral compound, respectively. KBr is the conjugate base of the strong acid HBr, and H2O is the conjugate acid of the strong base KOH. The reaction between KOH and HBr results in the formation of a salt, KBr, and water (H2O), through a neutralization reaction.

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9. (80-32)5/9

48×5/9

240/9

26.66°C

9. (90-32)5/9

58×5/9

32.22°C

10 (212-32)5/9

180×5/9

20×5

100°C

³⁸₁₈Ar nucleus completes the given equation, hence option D is correct.

The equation provided illustrates how an unstable chlorine isotope breaks down into a beta particle and an argon nucleus. To create an Argon nucleus that is more stable, the nucleus emits a beta particle.

Stable isotopes and supposedly unstable or radioactive isotopes are the two categories into which isotopes fall in science. These last ones are stable and don't produce radioactive radiation.

While Xenon and other isotopes are known to be stable, Xenon-124 and Xenon-136 deteriorate over the course of several trillion years.

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your nama nskdbksmabsbs

This might help you with your question.

This is a person who scientific researches to make more knowledge in a certain area of interest

a) The temperature of the air after passing through the heating section is 28°C, and the relative humidity is 50%.

b) The rate of heat transferred to the air is 452.25 kW.

c) The rate of water added by the evaporative cooler is 0.305 kg/min or 18.3 kg/h.

d) The evaporative cooler is important because it adds moisture to the air.

To determine the temperature and relative humidity of the air after it passes through the heating section, we can follow the following steps:

a) Temperature and Relative Humidity Calculation:

The air enters the evaporative cooler at 10°C with a relative humidity of 60%.

We need to calculate the water vapor pressure (Pw) using the saturation vapor pressure at 10°C, which is 1.227 kPa.

Pw = 60% x 1.227 = 0.736 kPa

The remaining partial pressure of the air (Pa) can be calculated by subtracting the water vapor pressure from the atmospheric pressure (101.3 kPa).

Pa = 101.3 - 0.736 = 100.56 kPa

Next, the air enters the heating section at 28°C. We need to calculate the water vapor pressure using the saturation vapor pressure at 28°C, which is 3.733 kPa.

Pw = 50% x 3.733 = 1.866 kPa

Again, calculate the remaining partial pressure of the air (Pa) by subtracting the water vapor pressure from the atmospheric pressure (101.3 kPa).

Pa = 101.3 - 1.866 = 99.43 kPa

Therefore, the temperature of the air after passing through the heating section is 28°C, and the relative humidity is 50%.

b) Rate of Heat Transfer Calculation:

The mass flow rate of the air is given as 25 m³/min.

We can convert the mass flow rate to kg/min by using the density of air.

Mass flow rate = Volume flow rate x Density

Density of air is approximately 1.225 kg/m³.

Mass flow rate = 25 x 1.225 = 30.625 kg/min

The specific heat capacity of air at constant pressure is 1.005 kJ/(kg·K).

Now we can calculate the rate of heat transferred using the formula:

Rate of heat transferred = mass flow rate x specific heat capacity x (Tout - Tin)

Tin = 10°C (temperature of air entering the evaporative cooler)

Tout = 28°C (temperature of air leaving the evaporative cooler)

Rate of heat transferred = 30.625 x 1.005 x (28 - 10) = 452.25 kW

Therefore, the rate of heat transferred to the air is 452.25 kW.

c) Rate of Water Added Calculation:

The mass flow rate of the dry air is the same as the mass flow rate of the air, which is 25 kg/min.

To calculate the specific humidity at the inlet and outlet, we need to determine the mass of water vapor and the mass of dry air.

Specific humidity at inlet = Pw / (Pa - Pw)

Pw = 0.736 kPa (calculated earlier)

Pa = 100.56 kPa (calculated earlier)

Specific humidity at outlet = Pw / (Pa - Pw)

Pw = 1.866 kPa (calculated earlier)

Pa = 99.43 kPa (calculated earlier)

Now we can calculate the rate of water added using the formula:

Rate of water added = mass flow rate of dry air x (specific humidity outlet - specific humidity inlet)

Rate of water added = 25 x (0.0193 - 0.0074) = 0.305 kg/min or 18.3 kg/h

Therefore, the rate of water added by the evaporative cooler is 0.305 kg/min or 18.3 kg/h.

d) Importance of Evaporative Cooler:

The evaporative cooler plays an important role in the air conditioning system because it adds moisture to the air. When hot and dry air enters the evaporative cooler, it passes through water-saturated pads that absorb moisture from the water and add it to the air. This process cools and humidifies the air, making it more comfortable to breathe. By increasing the relative humidity, the evaporative cooler helps to alleviate dryness and provides a more pleasant environment.

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Yes, liquid water can form lasting structures consisting of 6, 12, 13, 16 or more molecules. These structures are called clusters, which are aggregates of molecules held together by weak, non-covalent intermolecular forces such as hydrogen bonds.

The number of molecules in a cluster depends on the strength of these intermolecular forces, which can vary depending on environmental factors such as temperature, pressure and the presence of other molecules.

For example, the most common and stable clusters of water molecules consist of 6 (hexamer) and 12 (dodecamer) molecules, but larger clusters of 13, 16 or more molecules can also form. These larger clusters are less stable and have shorter lifetimes, but can still exist in liquid water for a time.

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Answer:

The solution formed is acidic

pH = 0.87

Explanation:

The acid-base reaction of NaOH with HCl is:

NaOH + HCl → NaCl + H₂O

Where 1 mole of NaOH reacts with 1 mole of HCl

In the problem, moles of NaOH and HCl are:

NaOH: 0.0250L × (0.525mol / L) = 0.013125 moles NaOH

HCl: 0.0750 × (0.355mol / L) = 0.026625 moles HCl

As moles of HCl > moles NaOH, HCl is in excess and the solution formed is acidic

Moles in excess of HCl are:

0.026625 moles - 0.013125 moles = 0.0135 moles HCl

As the volume of the solutions is 25.0mL + 75.0mL = 100.0mL = 0.100L, molarity of HCl after reaction is:

0.0135 moles HCl / 0.100L = 0.135M HCl = 0.135M H⁺

As pH is defined as - log [H⁺], pH of the solution is:

pH = -log 0.135M H⁺ = 0.87

pH = 0.87

The pH of the resulting solution of the acid and base mixture is; Acidic with a PH = 0.87

We are given;

Volume of NaOH = 25 mL = 0.025 L

Volume of HCl = 75 mL = 0.075 L

Concentration of NaOH = 0.525 M

Concentration of HCl = 0.355 M

Total volume of solution = 0.025 + 0.075 = 0.1 L

Now, the the equation of the reaction is;

HCl + NaOH = NaCl + H2O

We can see that 1 mole of HCl reacts with 1 mole of NaOH.

Since; number of moles = Volume × concentration

Number of moles of HCl = 0.075 × 0.355

Number of moles of HCl = 0.026625 moles

Similarly;

Number of moles of NaOH = 0.025 × 0.525

Number of moles of NaOH = 0.013125 moles

We can see that the number of moles of HCl is greater than that of NaOH and as such there is excess HCl acid in the mix.

Thus,

Excess moles of HCl acid = 0.026625 - 0.013125

Excess moles of HCl acid = 0.0135 moles

Concentration of this excess HCl is gotten by the formula;

M = Excess moles/total volume

M = 0.0135/0.1

M = 0.135 M

PH of this excess concentration is;

PH = -log [H+]

PH = -log [0.135]

PH = 0.87

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Answer: B

Explanation: to have a control, and many samples to investigate and cover the differences and anseretics.

In a survey that asked about alcohol use in high school students , the important measure for controlling bias is "Getting a random sample from all grade levels".

A chemical compound is found in alcoholic beverages like beer, wine, as well as liquor. Several medicines, mouthwashes, home items, as well as essential oils contain it.

In a survey that asked about alcohol use in high school students , the important measure for controlling bias is "Getting a random sample from all grade levels".

Therefore, the correct answer will be option (B).

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Answer:

if its 5X 10^3 mm=5m and if its 5X 10^-3 mm=5X 10^-6m

Explanation:

we know,

1m= 1000mm

as given 5X 10^3 mm we have to convert to meter

now  5X 10^3 mm= 5X 10^3/1000=5m

but if its  5X 10^-3 mm= 5X 10^-3/1000= 5X 10^-6m

thank u,

Answer:

option D and option B

Explanation:

water and bromine both belongs to inorganic compund..

The pressure when the volume is 1.67 l and the temperature is 305 k 1.604 atm.

Using the ideal gas equation:-

Given;

P₁ = 1.06 atm

V₁ = 2.37 L

T₁ = 286 K

P₂ = ?

V₂ = 1.67

T₂ = 305 K

P₁V₁/T₁ =P₂V₂/T₂

P₂ = P₁V₁T₂ /T₁V₂

   =  1.06 × 2.37 ×  305 /  286 × 1.67

    = 766.221 / 477.62

     = 1.604 atm

What is Pressure?

The physical force exerted on an item is called Pressure. The force applied is vertical to the surface of items per unit area. The basic formula for pressure is Force/Area.

What is an ideal gas?

An ideal gas is an intransigent gas composed of a set of irregularly-moving point atoms that interact only through elastic conflicts.

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Step 1

The reaction:

CaCO3 + heat => CaO + CO2 (completed and balanced)

-----------------------

Step 2

Information provided:

Actual yield = 0.53

The step involving the dehydration of alcohols to form alkenes using POCl3 in the presence of pyridine can be explained through a mechanism that involves the formation of a cyclic intermediate and the subsequent elimination of water. Curved arrows are used to represent electron reorganization during the process.

The dehydration of alcohols using POCl3 and pyridine involves a nucleophilic substitution reaction. The mechanism begins with the lone pair of electrons on the oxygen atom of the alcohol attacking the electrophilic phosphorus atom in POCl3. This forms a new bond between the oxygen and phosphorus atoms, while the chlorine atom of POCl3 leaves as a chloride ion.

The resulting intermediate is a cyclic structure known as an oxocarbenium ion, where the positive charge is localized on the carbon atom that was originally bonded to the hydroxyl group of the alcohol. The oxygen atom retains a positive charge.

In the next step, the pyridine molecule, acting as a base, abstracts a proton from the carbon atom of the oxocarbenium ion. This deprotonation step results in the formation of a carbon-carbon double bond, or an alkene, as well as the regeneration of the pyridine base.

During the mechanism, it is important to show the movement of electrons using curved arrows. These arrows indicate the flow of electron pairs and help illustrate the electron reorganization that occurs during bond formation and bond-breaking steps.

Overall, the mechanism for the dehydration of alcohols using POCl3 and pyridine involves the formation of a cyclic intermediate (oxocarbenium ion) followed by the elimination of water to generate the desired alkene product.

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