A gaseous sample of a substance is cooled at constant pressure. Which diagram best represents the situation if the final temperature is above the boiling point of the substance? A. a B. b C. c D. d Which diagram best represents the situation if the final temperature is below the boiling point but above the freezing point of the substance? A. a B. b C. c D. d

Answer:

Difusión

Explanation:

La difusión es el movimiento de las partículas de una sustancia desde una región de mayor concentración a una región de menor concentración.

La difusión es una evidencia de que la materia está compuesta de partículas.

Si abro un perfume en un extremo de una habitación, la fragancia se percibe en el otro extremo de la habitación después de unos segundos debido a la difusión

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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The molar mass (in units of g/mol) of the solute is 175 g.

The molar mass of atoms of an element is given by means of the relative atomic mass of the element accelerated via the molar mass steady, The definition of molar mass is genuinely the variety of grams that one mole of a substance weighs. every other definition of molar mass, is the sum of the atomic weights of the atoms that make up a molecule

One mole of any substance is equal to the Avogadro wide variety. This range as price 6.023 instances 10^{23}. it's miles useful to measure the goods in any chemical reaction. accordingly 6.023 instances 10^{23} of atoms, molecules or debris are 1 mol of atoms, molecules etc.

Solution;

T f = 2.34° C

mass of ascorbic acid = 55g

weight of solvent = 250 g = 0.25 kg

K f = 1.86 °C/m

Molar mass of the ascorbic acid by using formula

        T f = m*K f

molality = \(\frac{mass of ascorbic acid }{molar mass * weight}\)

So, molar mass = 1/0.25 * 55/molar mass *1/0.25 * 1.86  °C/m

Molar mass = 1/0.25 *55/2.34 * 1.86 1.86 °C/m

molar mass = 174.8 = 175 g/mol

Hence answer is  175 g/mol

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Explanation:

specific heat of aluminum = .9 j / (gm C)

.5 kg = 500 gm

500/ (20 C  * xJ)  = .9 j/(gm C)   <===== solve for x = 27.8 J

Answer:

C

Explanation:

Gas pressure can be described as the force exerted per unit area by gas molecules as they collide with the surface of a container. It is a measure of the average kinetic energy of the gas molecules.

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A buffer of 300 ml of 100 mM Tris pH 7.8 and 250 mM NaCl can be prepared by dissolving 3.64 g of Tris and 4.27 g of NaCl in 300 ml of water, and adjusting the pH to 7.8 using 10 ml of 1 M HCl. The % v/v refers to the volume of the solute while % w/v refers to the weight of the solute.

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The correct question would be as

How do you prepare 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl? % v/v,% w/v Questions.

Answer:

A

Explanation:

l took the test

Answer:

Q = 1455 J

Explanation:

Given data:

Mass of block = 300 g

Initial temperature = 22.3 °C

Final temperature = 59.9°C

Specific heat of lead = 0.129 j/g.°C

Energy required = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1 =  59.9°C - 22.3 °C

ΔT = 37.6  °C

Q = 300 g × 0.129 j/g.°C ×  37.6  °C

Q = 1455 J

Answer:

B.

Explanation:

Rust is a chemical change because you can not undo it. Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.

Moles of NH3 = 0.3 moles

N2 + 3H2 → 2NH3

4.2021 g of N2

Required

moles of NH3

Solution

mol N2 :

= 4.2021 g : 28 g/mol

= 0.15

From the equation, mol NH3 :

= 2/1 x mol N2

= 2/1 x 0.15

= 0.3 moles

Answer:

an element os3a material that consists of a single type of atom each type contains the same number of protons.

Atoms of K that are present in 7645.6 grams of K are 1178.03× 10²³.

What  is Avogadro’s number?

Avogadro's number is the number of units in one mole of any substance and equals to 6 .02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Given,

Mass of K = 7645.6 grams

Atomic mass of K = 39.09 g

39.09 g of K has 6 .02214076 × 10²³ atoms

1 g of K will have = 0.154× 10²³ atoms

7645.6 grams of K will have = 1178.03× 10²³ atoms

Therefore, Atoms of K that are present in 7645.6 grams of K are 1178.03× 10²³.

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Answer:

0.282 M

Explanation:

Please see the step-by-step solution in the picture attached below.

Hope this answer can help you. Have a nice day!

The concentration of the 15.0 mL sample of HCl is 0.282 M.

To find the concentration of HCl, we can use the concept of stoichiometry and the balanced chemical equation for the reaction between HCl (acid) and NaOH (base):

\(HCl + NaOH - > NaCl + H_2O\)

The balanced equation shows a 1:1 mole ratio between HCl and NaOH. Therefore, the moles of HCl that reacted will be equal to the moles of NaOH used at the equivalence point.

First, we find the moles of NaOH used:

Moles of NaOH = Volume (in L) × Concentration

Moles of NaOH = 0.0282 L × 0.150 mol/L = 0.00423 mol

Since the moles of HCl and NaOH are equal, the moles of HCl are also 0.00423 mol.

Now, we calculate the concentration of HCl:

Concentration of HCl = Moles of HCl / Volume (in L)

Concentration of HCl = 0.00423 mol / 0.0150 L = 0.282 M

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Answer: A stopwatch

Explanation:

You don’t needed

A student requires all of them except a balance. The correct option is A.

Students calculate the volume of various rods that have the same mass using the water displacement method. Each rod's density is calculated, and the distinctive densities of each material are used to distinguish the five rods.

Then, to explain why various rods have varied densities, students think about the connection between the mass, size, and arrangement of atoms. The periodic table will be briefly introduced to the class.

The volume displacement method is often used to determine the volume of an object with an irregular shape. This technique involves submerging an object into a known amount of water; as a result, the water level will rise.

Therefore, A student requires all of them except a balance. The correct option is A.

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Because the electron is negatively charged you can see that there will be repulsion between the ion and the electron making the process endothermic, hence the positive value.

It is possible because this is just one energy change in a series that may occur during a reaction.

The enthalpy change for the second electron affinity is defined as: Because the electron is negatively charged, there will be repulsion between the ion and the electron, making the reaction endothermic, thus the positive value.

Second electron affinities are positive because more energy is needed to attach an electron to a negative ion (i.e., second electron affinity), which outweighs any energy released during the attachment process.

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when two monomers are linked to form polymer,the new resulting molecule differs from the original two because it has lost a water molecule, two more hydrogen atoms.

Numerous monomers that have been linked together form polymers. When compared to a network of connected paperclips,polymers. For example. A polymer is a big molecule comprised of smaller monomers that are bonded together.

Polymer-based paints, epoxy glue, polyurethane foam cushions, silicone heart valves, polyethylene cups, fibreglass, nylon bearings, plastic bags, and Teflon-coated cookware are just a few examples of the products manufactured from polymers that are all around us. The list practically never ends.

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Answer: The correct answer is 188.03K.

Explanation:

As a result, the gas sample will have a volume of 551mL at a temperature of 188.03K.

Answer: D

Explanation: P = W/t

W = F d

When dividing, if you have a large number over a small, you get a large number. We want a small number, so we want the opposite for our P : W/ t formula. We want a small Work and a large time.

Right off the bat, the two with the least time aren't right then.

From there, we can estimate how much work it would take using the W = F d equation. If there is a small distance, there is less work, which is what we want to achieve a small work over large time.

So, the choice with the most time and the least distance should be correct.

Answer:

Just 1 i.e., Option B.

Because except for top of the molecule, all other sides are filled with a letter meaning there is one free space.

Answer:

B

Explanation:

H .  +  H .   ----->  H:H            {":" represents a covalent bond, that is, a shared pair of electrons}

A Lewis structure is a convention used to represent the covalent bonding in a molecule.   Dots or lines are used to represent

valence electrons (electrons available for bonding).  The Lewis structure for the hydrogen molecule is as follows.

     H:H  or  H-H

A bonding pair is an electron pair shared between two atoms.

A nonbonding pair (lone pair, unshared pair) is a pair of electrons that remains on one atom and is not shared.

Answer:

L-2.75 W-2.75 H-2.85

Explanation:

Answer:i dont know thats why imon her

Explanation:

Answer: The molarity of given solution is 17.75 M.

Explanation:

Given: Moles = 3.55 mol

Volume of solution = 0.2 L

Molarity is the number of moles of a solute present in liter of solution.

Hence, molarity of the given solution is calculated as follows.

\(Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{3.55 mol}{0.2 L}\\= 17.75 M\)

Thus, we can conclude that the molarity of given solution is 17.75 M.

Answer:

P2 = 0.95atm

Explanation:

Using Gay Lussac's equation as follows

P1/T1 = P2/T2

Where;

P1 = initial pressure

T1 = initial temperature

P2 = final pressure

T2 = final temperature

According to the information provided in this question; P1 = 1.00atm, T1 = 120°C, P2 = ?, T2 = 100°C

We need to convert temperature in °C to K

T1 (K) = 120°C + 273K = 393K

T2 (K) = 100°C + 273K = 373K

Hence;

P1/T1 = P2/T2

1.00/393 = P2/373

373 × 1 = 393 × P2

373 = 393P2

P2 = 373/393

P2 = 0.949

P2 = 0.95atm

Answer

False

Explanation:

Answer:

Answer: CH₃ and C₂H₆ have same empirical formula.

Explanation:

it just compares in that it its the same

Answer:c2h2 and c6h6,

Explanation:

Increasing temperature increases the rate of reaction in the gas phase. The correct option is c. increasing temperature

When the temperature is increased, the kinetic energy of gas molecules also increases, leading to more frequent and energetic collisions between the molecules. This higher collision frequency and energy result in a greater number of successful collisions with sufficient energy to overcome the activation energy barrier, thus increasing the rate of the reaction.

Out of the given options, increasing temperature is the factor that most significantly affects the rate of reaction in the gas phase. Catalysts can also increase the reaction rate, but they are not specifically mentioned in the options. Decreasing pressure and increasing volume are related to the physical properties of the gas rather than the reaction rate. Understanding the impact of temperature on reaction rates is crucial in various industrial and chemical processes, as it allows for control and optimization of reaction conditions to achieve desired reaction rates.

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a) The formation of benzalacetone as a side product may be undesirable because it reduces the yield of the desired product (e.g., if the reaction is intended to produce acetophenone)

Additionally, the presence of benzalacetone may complicate the purification of the desired product, as the two compounds may have similar physical and chemical properties.

b) The formation of 4-hydroxy-4-methyl-2-pentanone as a side product may be undesirable because it may affect the properties and functionality of the desired product (e.g., if the reaction is intended to produce a specific ketone).

Additionally, the presence of this side product may complicate the purification of the desired product, as the two compounds may have similar physical and chemical properties. In some cases, the formation of this side product may also indicate an undesired competing reaction pathway that reduces the yield of the desired product.

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Avogadro's number

1 mole = 6.02.10²³ particles (atoms, molecules, ions)

\(\tt 1.87\times 10^{24}\div 6.02\times 10^{23}=\boxed{\bold{3.11~moles}}\)

One mole of copper contains 6.02 × 10²³ copper atoms. Therefore, the number of moles that contains 1.87 ×10²⁴ copper atoms is 3.1 moles.

The number of atoms that constitutes one mole of a substance is called Avogadro number. It is equal to  6.02 × 10²³. Thus, one mole of every elements contains Avogadro number of atoms.

Similarly, one mole of a compound contains  6.02 × 10²³ number of molecules. Thus, one mole of carbon dioxide contains these much molecules.

Given the number of atoms of copper = 1.87 ×10²⁴

Then, no.of moles = number of atoms/ Avogadro number.

no.of moles =1.87 ×10²⁴ /6.022 × 10²³  = 3.1 moles.

Therefore, the number of moles of copper that contains 1.87 ×10²⁴ atoms is 3.1

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