The heat of vaporization (DHovap) of benzene at 298 Kelvin is 33.89 kJ/mol and its vapor pressure is 96 torr. Calculate Keq at 298 Kelvin.

Answer:

Check the electronic configuration of elements.

Explanation:

▪Valence electrons are the elwctrons present in the outermost shell of any element.

For example,

Electronic Configuration of Sodium = 2,8,1

Here , Sodium has 1 valence electrons.

▪Valency of an element is the total no. of electrons to be gained/losed in order to achieve duplet/octate state.

For example,

Electronic configuration of Sodium = 2,8,1

Sodium can achieve octate state either by losing 1 electron or gaining 7 electrons. But losing 1 electron is eay than gaining 7 electrons. So Valency of Sodium = +1

☆Metals have 1 or 2 or 3 valence electrons.

☆Non metals have 4 or 5 or 6 or 7 valence electrons.

☆Noble gases tend to stay in duplet/octate state i.e they have 2 or 8 valence electrons.

Answer : C. A hydrogen bond

Explanation:

Answer:

A. covalent bond

Explanation:

dipole-dipole interaction results from difference in electronegativity , eg H-F where Fluorine has strong electronegativity but Hydrogen has less electronegativity. hence the bond has dipole moment towards F atom.

Answer:

Given

mass of H2O (m) =35.6g

molarmass (mr) = H2O ), 1x2+16=18g/mol

moles of H2O (n) =?

sln

n=m/mr

n=35.6g/18g/mol

n=1.978moles

the moles of H2O are 1.978moles

Answer:

The mass of silver chloride produced = 2.202 g

Explanation:

Equation of the reaction is given below

3AgNO₃(aq) + FeCl₃(aq) ----> 3AgCl(s) + Fe(NO₃)₃(aq)

molar mass of AgNO₃ = 170 g/mol

molar mass of FeCl₃ = 233.5 g/mol

molar mass of AgCl = 143.5 g/mol

3 moles of silver nitrate reacts with 1 mole of iron (iii) chloride to give 3 moles of silver nitrate

4.15 grams of AgNO₃ = 4.15/170 = 0.0244 moles of AgNO₃

1.11 grams of FeCl₃ = 1.11/233.5 = 0.0047 moles of FeCl₃

mole ratio of AgNO₃ to FeCl₃ = 0.0244/0.0047 = 5 : 1

therefore, FeCl₃ is the limiting reactant

0.0047 moles of FeCl₃ reacting will produce 0.0047 *  3 moles of AgCl = 0.0141 moles of AgCl

0.0141 moles of AgCl = 0.0141 * 143.5 g of AgCl = 2.02 g of AgCl =

Therefore mass of silver chloride produced = 2.202 g

One pound of water needs an additional 970 Btu of heat to evaporate into one pound of steam (2256.2 kJ/kg). Since a thermometer cannot detect it, it is known as latent heat. Q.

To calculate the heat lost by the metal, we need to use the formula:

Q = m × c × ΔT

where Q is the heat lost by the metal, m is the mass of the metal, c is the specific heat of the metal, and ΔT is the change in temperature of the metal.

In this case, the metal was heated to 400.0°C and then placed onto a block of ice at 0.0°C, so the change in temperature of the metal is:

ΔT = 400.0°C - 0.0°C = 400.0°C

The mass of the metal is given as 125.0 grams, and the specific heat of the metal is 0.245 J/g°C. Substituting these values into the formula, we get:

Q = m × c × ΔT

Q = (125.0 g) × (0.245 J/g°C) × (400.0°C)

Q = 12,250 J

Therefore, the heat lost by the metal is 12,250 J.

A line graph of a heating or cooling curve can be used to calculate latent heat. The temperature of a known mass of ice can be checked every second if a heater with known power is used, such as a 60 W immersion heater that produces 60 J/s.

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The coefficient of Fe would be 2, the coefficient of Cl2 would be 3, while the coefficient of FeCl2 would be 2.  

The balanced equation of the reaction would be as follows:

\(2Fe(S) + 3Cl_2 ---> 2FeCl_3(S)\)

Thus, the coefficients of Fe, Cl2, and FeCl3 respectively would be 2, 3, and 2.

In other words, 2 moles of Fe require 3 moles of Cl2 to produce 2 moles of FeCl3 in a complete reaction.

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Resonance is correct answer

What is resonance?

The word "resonance" comes from the Latin word "resonantia," which means "echo," and the verb "resonare," which means "to resound." The term originated in the study of acoustics, specifically the sympathetic resonance seen in musical instruments, such as when one string begins to vibrate and produce sound after another one is struck.

There are many different forms of vibrations or waves that exhibit resonance phenomena, including mechanical, orbital, acoustic, electromagnetic, nuclear magnetic, electron spin, and quantum wave function resonances. Resonant systems can be employed to produce vibrations at a particular frequency (such as those produced by musical instruments) or to isolate particular frequencies from a complicated vibration that contains a range of frequencies (e.g., filters).

When the frequency of an applied periodic force (or one of its Fourier components) is equal to or nearly equal to the natural frequency of the system on which it works, the phenomenon of enhanced amplitude known as resonance results. A dynamic system's oscillations will have a greater amplitude when an oscillating force is applied at its resonant frequency than when the same force is applied at other, non-resonant frequencies

Due to the storage of vibrational energy, small periodic stresses that are close to the system's resonance frequency can cause oscillations in the system with enormous amplitudes.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Taking into account the definition of Avogadro's Number, 4.83×10²⁴ atoms of He are in 32.10 g of He.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole.

Its value is 6.023×10²³ particles per mole.

The molar mass of He is 4 g/mole. You can apply the following rule of three: If by definition of molar mass 4 grams of He are contained in 1 mole of He, 32.10 grams of He are contained in how many moles?

moles= (32.10 grams × 1 mole)÷ 4 grams

moles= 8.025 moles

The amount of moles of He in 32.19 grams is 8.025 moles.

You can apply the following rule of three: If by definition of Avogadro's Number 1 mole of He contains 6.023×10²³ atoms, 8.025 moles of He contains how many atoms?

amount of atoms of He= (8.025 moles × 6.023×10²³ atoms)÷ 1 mole

amount of atoms of He= 4.83×10²⁴ atoms

Finally, 4.83×10²⁴ atoms of He are present.

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The entropy change in the system (ΔS) when one mole of water vaporizes at 100°C and a pressure of one atmosphere is 109.1 J/K.

To calculate the entropy change (ΔS) when one mole of water vaporizes at 100°C (373 K) and a pressure of one atmosphere, we can use the formula:

ΔS = ΔH° / T

where ΔH° is the enthalpy change (40.7 kJ) and T is the temperature in Kelvin (373 K).

Converting ΔH° to Joules (1 kJ = 1000 J):

ΔH° = 40.7 kJ * 1000 J/kJ = 40700 J

Now, we can plug in the values:

ΔS = 40700 J / 373 K = 109.1 J/K

So, the entropy change (ΔS) when one mole of water vaporizes at 100°C and a pressure of one atmosphere is 109.1 J/K.

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Answer:

have systems for transporting water and minerals

Explanation:

hope its helps

The main difference between root and non-root plants is that root plants have root tissue that transports water, minerals and nutrients, while non-root plants do not have root tissue.

3.6 ×10²⁴ atoms fluorine are in 410 g of UF\(_6\). Fluorine is an atomic number 9 chemical element with both the symbol F.

Fluorine is an atomic number 9 chemical element with both the symbol F. This is the smallest halogen as well as occurs as a very poisonous, pale yellow diatomic vapor under normal circumstances.

It is exceptionally reactive being the most electronegative active catalyst, reacting with all other elements save the light inert.

mole =  410 / 352.02 =1.16mole

number of atom= 1.16× 6.022×10²³=6.98×10²³

number of atom of fluorine =6× 6.98×10²³= 3.6   ×10²⁴ atoms

Therefore, 3.6 ×10²⁴ atoms fluorine are in 410 g of UF\(_6\).

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Answer: 26C is 25.0 torr

Explanation: The decrease in vapor pressure is proportional to the molality of the solution, so the vapor pressure of the solution at 26°C is 25.0 torr.

First, we need to find the number of moles of glucose and water present in the solution:

n(glucose) = 16.0 g / 180.0 g/mol = 0.089 mol

n(water) = 80.0 g / 18.0 g/mol = 4.44 mol

Next, we'll find the mole fraction of water in the solution:

X_water = n(water) / (n(glucose) + n(water)) = 4.44 / (0.089 + 4.44) = 0.989

Finally, we can find the vapor pressure of the solution using Raoult's law:

P_solution = X_water * P_purewater = 0.989 * 25.21 torr = 25.0 torr

So the vapor pressure of the solution at 26°C is 25.0 torr.

Water will experience a 5230 joule heat change.

What is heat change of water ?

One of its most crucial properties is the fact that heating water uses a lot of energy. To be precise, 4,184 joules of water must absorb one calorie of heat for every degree Celsius that the temperature rises. For comparison, it takes just 385 joules of heat to heat one kilogram of copper to one degree Celsius.

Specific heat capacity of water

=4.184j/g. o C

Q= m water x C water x (T f - TI)

=250.0g x4184jj/g .o C x(25.0 -20.0)o c

=5230 joules

What is heat capacity?

The ratio of heat absorbed to temperature change by a material is known as heat capacity. The actual amount of material being considered, which is often a mole, is typically expressed as calories per degree (the molecular weight in grams).

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Partial bonding, for example, as part of a resonance hybrid, often results in structures with fractional bond orders.

What is resonance?

Resonance in chemistry, also known as mesomerism, is a means to describe bonding in specific molecules or polyatomic ions by fusing a number of contributing structures into a resonance hybrid according to valence bond theory.

Resonance structure identification guidelines:

Atoms are immobile. Electrons can only be moved in bonds or lone pairs (that are in p orbitals) The system's total fee must not change. A molecule's bonding structure needs to be preserved.

Therefore, Partial bonding, for example, as part of a resonance hybrid, often results in structures with fractional bond orders.

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Based on the graph and the information provided, it can be stated another solution took place as there is a change in the properties of the substance.

The word "transmittance" refers to the ratio or in this case the percentage of light that can pass through a substance of object. This concept implies that if the tranmittance is 100% is beceuse 100% of the light is passing through the sample and 0% is of the light is being absorbed by it. In the same way if the transmittance is 20% is because the solution has likely become more dense and 80% of the light is being absorbed.

Considering the transmittance is directly related to concentration and density if there is a big change in the transmittance such as this returning to 100% it is likely because there was a chemical reaction that changed the properties (density) or concentrion of the sample.

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Answer:

A) a new type of refrigerant that is less damaging to the environment is developed.  Applied development

B) a new element is synthesized in a particle accelerator.  Basic development.

C) a computer is redesigned to increase the speed of the computer. Technological development.

Explanation:

The rate constant of a first-order reaction takes 560 seconds for the reactant concentration, Hence the rate constant of the first-order reaction is approximately 0.00124 s⁻¹.

In a first-order reaction, the rate of reaction is directly proportional to the concentration of the reactant. The rate law for a first-order reaction can be expressed as:

Rate = k[A]

where:

Rate is the rate of reaction

k is the rate constant

[A] is the concentration of the reactant

In this case, we are given that it takes 560 seconds for the reactant concentration to drop to half of its initial value. The half-life of a first-order reaction is defined as the time it takes for the reactant concentration to decrease to half of its initial value. The half-life (t₁/₂) can be related to the rate constant (k) as follows:

t₁/₂ = (ln 2) / k

Given that t₁/₂ = 560 seconds, we can rearrange the equation to solve for the rate constant (k):

k = (ln 2) / t₁/₂

Substituting the given values:

k = (ln 2) / 560 ≈ 0.00124 s⁻¹

Therefore, the rate constant (k) for the first-order reaction is approximately 0.00124 s⁻¹.

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Answer:

A1. Sr + 2

A2. P - 3

B1. Sr3P2

Explanation:

A1. Strontium ion | Sr+2

Description: Strontium(2+) is a strontium cation

Molecular Formula: Sr+2

A2.  PubChem CID     5182128

Structure Find Similar Structures

Molecular Formula P-3

B. Strontium phosphide

PubChem CID 166710

Structure Find  Similar Structures

Molecular Formula  Sr3P2 or P2Sr3

The respective concentrations of copper in the three solutions are 0.018 g/L, 0.012 g/L, and 0.0081 g/L.

The concentration of copper in the solutions can be determined using the Beer's law equation, A = εbc, where A is the absorbance, ε is the molar absorptivity, b is the path length, and c is the concentration.
First, we need to determine the molar absorptivity, ε, using the data from the standard solutions. We can rearrange the Beer's law equation to solve for

ε: ε = A/bc.
Since the path length, b, is the same for all the solutions, we can use any of the standard solutions to calculate ε. Let's use the first standard solution:

ε = 0.500 / (10.0 mL / 1000 mL/L) / (0.200 g/L / 63.55 g/mol) = 1580.95 L/mol·cm

Now that we know the molar absorptivity, we can use the Beer's law equation to determine the concentration of copper in the three unknown solutions:
(a) c = A / εb = 0.450 / (1580.95 L/mol·cm)(1 cm) = 2.85 x 10^-4 mol/L = 0.018 g/L
(b) c = A / εb = 0.300 / (1580.95 L/mol·cm)(1 cm) = 1.90 x 10^-4 mol/L = 0.012 g/L
(c) c = A / εb = 0.200 / (1580.95 L/mol·cm)(1 cm) = 1.27 x 10^-4 mol/L = 0.0081 g/L

Therefore, the respective concentrations of copper in the three solutions are 0.018 g/L, 0.012 g/L, and 0.0081 g/L.

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Answer:

Carbon plays a unique role among the chemical elements. ... Due to its four valence electrons, carbon is the smallest element that is able to make covalent bonds to four different atoms in its neutral form.

Answer: The sample absorbed 3061.565J

Explanation:

Given that  

Mass of water  = 335g

Initial temperature  = 24.5°C

Final temperature = 26.4°C

Heat  absorbed by the sample is given as  = mass x specific heat of water x  temperature change

Heat  absorbed,q=mCΔt

The specific heat of water,C  = 4.81J/g°C

Therefore,  Heat absorbed,q  = 335 x 4.81h x (26.4  - 24.5)  = 3061.565J

Answer:

2660.57 J

Explanation:

26.4 - 24.5 = 1.9

335 x 4.18 x 1.9 = 2660.57 J

That is the correct answer.

Answer:

homogeneous mixture

Explanation:

A homogeneous mixture and Solution are the physical blend of two or more substances with uniform composition. Thus, options A and C are true.

“Mixture is an act of combining two or more chemical substances that are not chemically linked.”

Types of mixtures –

There are two main types of mixture.

Homogeneous Mixture –

A Homogeneous Mixture is a mixture in which composition is uniform throughout the mixture, and it appears like a single substance.

Example – Air is a homogeneous mixture of gas etc.

Heterogeneous mixture –

A Heterogeneous mixture is a mixture in which composition is not uniform throughout the mixture.

Example – Vegetable soup is a heterogeneous mixture etc.

Solution –

A Solution is a homogeneous mixture of two or more solutes dissolved in a solvent.

Example – Solution of sugar in water etc.

Thus, a homogeneous mixture and solution are the physical blends of two or more substances with uniform composition. Thus, options A and C are true.

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Answer:

No, gravity isn't matter

Explanation:

Gravity is a force that attracts matter towards the center of a physical body with mass.

Answer:

Products

Explanation:

The materials you end up with in a reaction are called the products of the reaction.

For example;

        A  + B →  C + D

A and B are the reactants

C and D are the products.