A gas expands from 2.5 L to 8.6 L at a constant temperature. If the initial pressure is 1.6 atm, what is the final pressure?

To find out how many moles is 1.5x10^23 atoms of Carbon, we will use Avogadro's number, which is represented by 6.022x10^23 atoms or molecules per mol.

To convert from atoms to moles, divide the atoms by Avogadro's number.

So, now we can convert the numbers into proper form:

1.5x10^23 ---> 1.5E23

6.022x10^23 ---> 6.022E23

Then, we divide them.

1.5E23/6.022E23 = 0.24908

Round to nearest hundredth.

0.24908 --> 0.25

Therefore, there are 0.25 moles of carbon in 1.5E23 atoms of carbon.

Answer: Moseley's experiments in X-ray spectroscopy showed directly from their physics that cobalt and nickel have the different atomic numbers, 27 and 28, and that they are placed in the Periodic Table correctly by Moseley's objective measurements of their atomic numbers.

Explanation:

Answer:

hey are the results of many experiments over a long period of time.

Explanation:

For this section:

(d) To determine which acid would be completely dissociated when dissolved in water, consider the strength of the acid and its ability to ionize completely. Strong acids are those that ionize completely in water, while weak acids only partially dissociate.

Among the given options:

(H O)₂SO is sulfuric acid (H₂SO₄), which is a strong acid and completely dissociates in water.

(H O)IO₃ is iodic acid (HIO₃), which is also a strong acid and completely dissociates in water.

(H O)₂SO₂ is not a known acid and cannot be evaluated for dissociation.

HCO₂H is formic acid (HCOOH), which is a weak acid and only partially dissociates in water.

Therefore, the acids that would be completely dissociated when dissolved in water are (H O)₂SO and (H O)IO₃.

(e) To estimate the pH of the given solutions formed by titration, compare the moles of the acid and base used in the reaction.

(i) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous HCl, the reaction between a strong acid (HCl) and a strong base (NaOH) forms a neutral salt (NaCl) and water. The resulting solution would have a pH of 7, indicating neutrality.

(ii) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous acetic acid, consider the ionization of acetic acid and the formation of its conjugate base. The pKa of acetic acid is given as 4.76.

Since the volumes and concentrations of the acid and base are equal, we have a 1:1 mole ratio between them. This means that half of the acetic acid will be neutralized, and the remaining half will be in the form of the conjugate base (acetate ion, CH₃COO-). The resulting solution will be a buffer solution with a pH close to the pKa of acetic acid, which is 4.76.

(f) To predict the products formed from mixing the given reagents, we need to consider the reactions and the possible chemical reactions that occur.

(i) 3I₂ + PBr₃: This reaction involves the combination of iodine (I₂) with phosphorus tribromide (PBr₃). The balanced equation is:

3I₂ + 2PBr₃ → 6IBr + P₂

(ii) 4LiH + GaCl₃: This reaction involves the combination of lithium hydride (LiH) with gallium trichloride (GaCl₃). The balanced equation is:

4LiH + GaCl₃ → 4LiCl + GaH₃

(iii) NH₃ + BCl₃: This reaction involves the combination of ammonia (NH₃) with boron trichloride (BCl₃). The balanced equation is:

NH₃ + BCl₃ → NH₃BCl₃

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Answer:

990

Explanation:

Answer &

Explanation:

eukaryotic: Having complex cells in which the genetic material is contained within membrane-bound nuclei. cell: The basic unit of a living organism, consisting of a quantity of protoplasm surrounded by a cell membrane, which is able to synthesize proteins and replicate itself.

therefore it is cell

Answer:

H2O / H+

Explanation:

In alkene hydration, water, being a very weak acid, with insufficient proton concentration, does not have the capacity to initiate the electrophilic addition reaction. An acid must be added to the medium for the reaction to take place.

The mechanism proceeds with the formation of a carbocation after adding the proton to the double bond. Alkene hydration is Markovnikov, that is, the proton is added to the less substituted carbon of the alkene.

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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Answer:

1.904 ppm

Explanation:

Concentration of drug in units of ppm = mass of solute / (mass of solution ) × 1000000

mass of blood = density of blood × volume = 1.05 g / ml × 5000 ml = 5250  g

mass of solution = mass of blood + mass of solute ( statin) = 5250 + 0.01 g  = 5250.01 g

Concentration of drug in units of ppm = (0.01 g / 5250.01 g) × 1000000 = 1.904 ppm

I hope this helps!!

Answer:

linear ,trigonal planar,tethradral geometry

Answer:

linear

trigonal planar

tethradral geometry

Explanation:

edge

The temperature of the reaction should be decreased

This change in temperature would make the equilibrium to shift to the right.

The Le Chatelier's principle, commonly referred to as the Le Chatelier's principle of equilibrium, is a chemical principle that describes how an equilibrium system reacts to environmental changes.

According to this theory, when an equilibrium system is exposed to an outside force, it will respond in a way that partially offsets the imposed change and restore equilibrium.

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Answer:

Depends on what the answers say.

Explanation:

But from what I know, the equation is:

6CO2 + 6H2O------> C6H12O6 + 6O2

And also that arrow there should mean in the presence of sunlight and chlorophyll.

Answer:

Ca(OH)2 is the base and CaCl2 is the salt

Explanation:

i think this is the answer because calcium hydroxide has hydroxide ions as the only positively charged ion and calcium chloride is a salt.

I hope this helps

The chemical equation for the formation of calcium chloride has Ca(OH)₂ as the base and CaCl₂ as the salt. Hence, option A is correct.

Salt is given as the neutral compound with the presence of the acidic and the basic constituents. The salt can be formed as a result of the neutralization reaction of acid and base.

The acids are comprised of the presence of the hydrogen ion, and the base comprises the presence of the hydroxide ions. Thus, in the given reaction, Ca(OH)₂ is the base and CaCl₂ is the salt. Hence, option A is correct.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer:

The percentage of IF₅ (by mole) in the final product mixture will be 50%. This is determined by the stoichiometry of the reaction, the given molar mass of the reactants, and the ideal gas law.

Explanation:

The reason why the Ionic and covalent bonds help arrange atoms into unique structures for proteins like hemoglobin is that the structure of a protein allows it to carry out its unique function.

The covalent bond is the kind of bond that exists between two atoms in which the electrons between the two atoms are shared. The electrons cloud of the bond lies between the two atoms. For the ionic bond, there is a transfer of the electrons from one atom to another. We ought to note that the transfer is  often from the metal to the non metal.

On the other hand, it should be noted that there are various kinds of bonding that are important to be able to keep the structure and the function of the protein. Aside from the covalent bonds that holds the atoms together, the ionic bonds could also be involved in the dipolar interactions that are responsible for the secondary structure of the protein.

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B. The structure of a protein allows it to carry out its unique function.

ur welcum

The energy of a photon is given by:

The formula can be written to solve for the wavelength (lambda):

Answer: wavelength is 4.34x10^-7 m

Answer:

39.99711

Explanation:

Have a good day

Answer:

C. aquifer

Explanation:

I just did a lesson on this

:)

The ozone layer is present in the stratosphere layer of the Earth's atmosphere. Therefore, option (C) is correct.

An atmosphere can be defined as layers of gases that envelop a planet and is held in place due to the gravity of the planetary body. A planet contains an atmosphere when the gravity is great and the temperature of the atmosphere of any planet is low.

Earth's atmosphere is made of Nitrogen (78 %), Oxygen (21%), Argon (0.9%), and Carbon dioxide (0.04 %).  The troposphere can be defined as the lowest layer of the atmosphere. The troposphere contains 75 to 80 % of the mass of the atmosphere.

The stratosphere contains the ozone layer, at an altitude between 15km and 35km. This atmospheric layer absorbs most of the UV radiation that Earth receives from the Sun.

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The cell's reaction is not disrupted, and the electrons continue to flow between the two half-cells through the wire to produce electricity.

In a voltaic cell, a salt bridge is utilized to maintain the electrical neutrality of the half-cells. A salt bridge is an ionic conductor that allows the movement of cations and anions between the two half-cells without allowing any mixing of the electrolytes.

Its primary function is to prevent the buildup of electric charges on the electrodes, which would result in a sudden stop of the reaction in the cell.What is a salt bridge-A salt bridge is an electrolytic channel that connects the oxidation and reduction half-cells of a voltaic cell to allow ions to flow between them.

The salt bridge is essential to maintain the electrical neutrality of the half-cells and maintain the cell's electrical energy. What is the purpose of the salt bridge in this cell?In the given cell, the salt bridge purpose is to keep the electrical neutrality of the half-cells.

The salt bridge ensures that the cell's two half-cells maintain their neutrality by providing a flow of ions from one half-cell to the other. As a result, the cell's reaction is not disrupted, and the electrons continue to flow between the two half-cells through the wire to produce electricity.

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Answer:

Explanation:

We know that,

1 kg = 1000 g

1  m = 100 cm

Therefore

1 m^3 = 1000000 cm^3

Therefore in order to convert the density of CO2 in grams/cm^3

1.98 kg/m^3 = (1.98 × 1000) /  10^6

=1.98 × 10^(-3) grams/cm^3.

Answer:

D

Explanation:

Alkene is transformed to alcohol via the oxymercuration-demercuration reaction. The reagent employed in this reaction is mercury (II) acetate in tetrahydrofuran, which also serves as the solvent.

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How many mL of a 0.10 M NaOH solution are needed to neutralize 15 mL of 0.20 M H3PO4?

  5.0 (328)

Ph. D. in organic chemistry with 6+ years of teaching experi..

Write down the balanced reaction first

3NaOH + H3PO4   makes    Na3PO4 + 3H2O

Given 0.10M NaOH (0.10mol/lit NaOH)

0.2M H3PO4 ( 0.2 mol/lit H3PO4)

15 ml of H3PO4 or 0.015 lit of H3PO4

Find volume of NaOH needed to neutralize the solution

Relate moles of H3PO4 with the moles of NaOH with the helps of coefficients in front of NaOH and H3PO4 seen in balanced equations.

               moles ↔ Litre use definition of molarity (moles/litrs)

Start with what is given for H3PO4

0.015 lit of H3PO4 x 0.2 moles of H3PO4 / lit of H3PO4 x 3 moles of NaOH/1 mole of H3PO4 x lit of NaOH/0.1 mol of NaOH = 0.09 lit or 90 ml.

The same colors in above equations cancel our leaving lit of NaOH as final answer.

Considering the combined law equation, you would have a volume of 9.28 mL at 25.0 C and 2.25 atm.

Boyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant.

This law says that volume is inversely proportional to pressure: if pressure increases, volume decreases, while if pressure decreases, volume increases.

Mathematically, Boyle's law states that the multiplication of pressure by volume is constant:

P×V= k

Charles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant.

This law says that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases, while if the temperature of the gas decreases, the volume decreases.

Mathematically, Charles' law states that the ratio of volume to temperature is constant:

\(\frac{V}{T}=k\)

Gay-Lussac's law establishes the relationship between the temperature and pressure of a gas when the volume is constant.

This law says that the pressure of the gas is directly proportional to its temperature: if the temperature increases, the pressure increases, while if the temperature of the gas decreases, the pressure decreases.

Mathematically, Gay-Lussac's law states that the ratio of pressure to temperature is constant:

\(\frac{P}{T}=k\)

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\(\frac{PV}{T}=k\)

Considering an initial state 1 and a final state 2, the following holds:

\(\frac{P1V1}{T1}=\frac{P2V2}{T2}\)

In this case, you know:

Replacing in the combined law equation:

\(\frac{1.89 atmx10.9 mL}{294 K}=\frac{2.25 atmxV2}{298 K}\)

Solving:

\(\frac{1.89 atmx10.9 mL}{294 K}\frac{298K}{2.25 atm} =V2\)

9.28 mL= V2

Finally, you would have a volume of 9.28 mL at 25.0 C and 2.25 atm.

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Answer: Booting up the computer: When you turn on the computer, it requires a burst of energy to start up the various components and initialize the operating system.

Explanation: