what is the mass, in grams, of 1.28 mol of water, h2o ? express the mass in grams to three significant figures. view available hint(s)for part a

The difference between the highest point on the reaction profile and the energy of the reactants is the activation energy of the reaction.

The energy change between the reactants and the products is shown by a potential energy diagram or a reaction profile.

Looking at the reaction profile, we can see that the products have more energy than the reactants, indicating that the reaction is endothermic. By subtracting the energy of the products from the energy of the reactants, the enthalpy change is obtained.

Thus, The activation energy of the reaction is the difference between the highest point on the reaction profile and the energy of the reactants.

To learn more about the potential energy diagram, follow the link;

https://brainly.com/question/12078312

#SPJ9

Your question is incomplete, the image of energy diagram is attached below

The rate law consistent with this mechanism is Rate = k[A][B]. Thus, option C is correct.

An expression that establishes a connection between the rate of a reaction and the concentrations of the reactants involved is known as the rate law (also known as the rate equation) for a chemical reaction.

It is significant to remember that the rate law's expression for a particular reaction can only be discovered through experimentation. From the balanced chemical equation, the rate law expression cannot be obtained (since the partial orders of the reactants are not necessarily equal to the stoichiometric coefficients).

The step that determines the overall speed (rate) of a chemical reaction is the step that moves the slowest.

Therefore, Rate = k[A][B] is the law consistent with this mechanism.

To learn more about Chemical Kinetics click given link;

brainly.com/question/29735982

#SPJ4

The correct answer is B) the size of an orbital.

The n quantum number, also known as the principal quantum number, is an integer value that determines the energy level and size of an orbital in an atom. The value of n ranges from 1 to infinity, with higher values of n corresponding to higher energy levels and larger orbitals.

The size of an orbital is determined by the distance between the electron and the nucleus. As the value of n increases, the distance between the electron and the nucleus increases, and the size of the orbital increases as well. This means that orbitals with higher values of n have more volume and can hold more electrons.

The other quantum numbers are associated with other properties of the electron orbitals. The l quantum number is associated with the shape of an orbital, the m quantum number is associated with the orientation of an orbital in space, and the spin quantum number is associated with the spin of an electron.

To learn more about Orbitals :

https://brainly.com/question/23160372

#SPJ4

The percentage of purple offspring and green offspring are 25% and  25% respectively.

Offspring are living creatures' young creations, generated either from a single organism as well as, inside the event of sexual reproduction, by two organisms. In a broader sense, collective children may be referred to by the term brood or progeny.

This can apply to a group of children born at the same time, such as chicks hatching from a single clutch of eggs, or to the entire offspring, as in the case of the honeybee.

purple offspring = 25%

green offspring = 25%

Therefore, the percentage of purple offspring and green offspring are  25% and  25% respectively.

To learn more about offspring, here:

https://brainly.com/question/10021635

#SPJ9

Your question is incomplete but most probably your full question was,

If G = green and g = purple, how many offspring will be purple if the parents' genotypes are gg and write the percentage of offspring that is green and the percentage that is purple. 25%, 35%,45%

The answer is approximately 1332.75 g of ice can be melted if 24.9 kJ of thermal energy are added at the freezing point.

Thermal energy refers to the energy contained within a system that is responsible for its temperature.

The heat required to melt a substance is equal to the enthalpy of fusion of that substance times its mass. The molar enthalpy of fusion of ice is 333.55 J/mol, so the amount of heat required to melt 1 mol of ice is 333.55 J.

To find the mass of ice that can be melted with 24.9 kJ of thermal energy, we first need to convert the energy from kJ to J:

24.9 kJ = 24.9 x 10^3 J = 24900 J

Next, we divide the amount of thermal energy by the molar enthalpy of fusion of ice to find the number of moles of ice that can be melted:

24900 J / 333.55 J/mol = 74.22 mol

Finally, we multiply the number of moles of ice by its molar mass to find the mass of ice in grams:

74.22 mol x 18.02 g/mol = 1332.75 g

Therefore, The answer is approximately 1332.75 g of ice can be melted if 24.9 kJ of thermal energy are added at the freezing point.

Learn more about thermal energy here: brainly.com/question/934320

#SPJ1

The diagram shows the potential energy of both reactions. The reactants of reaction 1 have a lower potential energy than those of reaction 2, indicated by the lower starting point on the graph.

Potential is the capacity or ability to become or develop into something in the future. It can refer to physical, mental, or spiritual power and potential. Potential is often seen as untapped or unused and can be developed through effort and determination. Potential is also seen as the ability for growth and development, and the potential for a person or thing to reach its fullest potential. Potential can be seen as the capacity to do something, even if it has yet to be realized. It is often seen as a measure of one's potential for future success or achievement.

Reaction 1 has a higher activation energy, indicated by the greater distance between the reactants and products. This means that reaction 1 requires more energy to proceed than reaction 2, making it an endothermic reaction.

To learn more about potential

https://brainly.com/question/14427111

#SPJ1

A line known as the Saturated Liquid Line can be used to connect the saturated liquid states on a T-V diagram, while the Saturated Vapor Line can be used to connect the saturated vapor states.

To learn more about Saturated Vapor Line, refer to:

https://brainly.com/question/18095323

#SPJ4

When additional A(g) is added to the following system at equilibrium, the actors that will change are pressure, temperature, reaction rate and concentration.

Concentrations of A, B, and C: The concentration of A will increase, while the concentrations of B and C will decrease. The extent of the changes will depend on the stoichiometry of the reaction and the equilibrium constant.

Pressure: The addition of A(g) will increase the pressure of the system, assuming the volume is constant. This may cause a shift in the equilibrium position to favor the side with fewer moles of gas, which in this case is the reactant side.

Temperature: The addition of A(g) may cause a temperature change in the system. If the reaction is exothermic, the addition of A(g) will increase the temperature of the system and may cause a shift in the equilibrium position to favor the reactants. If the reaction is endothermic, the addition of A(g) will decrease the temperature of the system and may cause a shift in the equilibrium position to favor the products.

Reaction rate: The addition of A(g) may temporarily increase the rate of the forward reaction, but the system will eventually reach a new equilibrium position with the same equilibrium constant.

To know more about equilibrium here

https://brainly.com/question/11336012

#SPJ4

The creation of dihydropyran Tetrahydrofurfuryl alcohol is converted into dihydropyran by reacting it with the arenesulfonic acid arso3h.

Here's the reaction mechanism for the synthesis of dihydropyran from tetrahydrofurfuryl alcohol and arylsulfonic acid:

First, the acid protonates the alcohol to make it a better leaving group:

OH-CH2CH2CH2CH2-OH + ArSO3H → OH2+-CH2CH2CH2CH2-OH + ArSO3-

The product is then deprotonated by a base, such as sodium methoxide, to form dihydropyran:

[OC(CH2)2-Ar]+SO3- + NaOCH3 → OC(CH2)2-Ar + NaSO4CH3-

Overall, the reaction can be represented as:

OH-CH2CH2CH2CH2-OH + ArSO3H → dihydropyran + NaSO4CH3-

Learn more about   movement of electrons here:

https://brainly.com/question/11905668

#SPJ4

Consequently, each of the following compounds is conjugated with a diene: compound a; conjugated with a trine; compound c; and conjugated with a diene: compound d.

When one hydrogen atom is taken out of an alkane, a group of atoms known as an alkyl group is created. The group is given a name by changing the parent hydrocarbon's -ane suffix to -yl. For instance, the -CH3 group, which is also known as a methyl group, is created when one hydrogen atom is removed from methane (CH4). In organic chemistry, a methyl group is an alkyl produced from methane that has the chemical formula CH3, one carbon atom bound to three hydrogen atoms. The group's name is frequently shortened to Me in formulas. In numerous organic molecules, this hydrocarbon group can be found. In most compounds, the group is extremely stable.

Methyl has a carbon atom and three hydrogen atoms, whereas ethyl has two carbon atoms and five hydrogen atoms. As a result, the ethyl group has a higher molar mass than the methyl group. Alkane ethane is the source of methyl, while alkane methane is the source of ethyl. 3-Methylpentane is the IUPAC name for the substance in question. It has a lengthy chain of 5 carbon atoms, which gives it the prefix pent-, and a single bond is what gives it the postfix -ane (alkane). Given that the methyl group is present at the third carbon, it is 3-methylpentane.

To know more about Methyl and Ethyl visit:

https://brainly.com/question/29589700

#SPJ4

The ions such as the cations found in seawater originally came from Earth's crust whereas the anions originated from Earth's mantle.

An ion is defined as an atom or a molecule which has a net electrical charge. There are 2 types of ions :1) cation 2) anion . The cation is the positively charged ion and anion is the negatively charged ion . As they are oppositely charged they attract each resulting in the formation of ionic bond.

Ions consisting of single atom are mono-atomic ions while which consists of two or more ions are called as poly-atomic ions . They are created by chemical interactions .

Learn more about ions,here:

https://brainly.com/question/1447156

#SPJ1

The appropriate values for the solution's molality and molarity are:

M is 1.20 M, while m is 1.22 M.

We must first determine how many moles of NaCl are present in the solution:

Moles of NaCl are equal to the mass of NaCl divided by its molar mass, which is 10.5 g/58.44 g/mol, or 0.180 mol.

We must divide the number of moles of NaCl by the litres of the solution's volume to determine its molarity:

Molarity (M) is equal to moles of NaCl per litre of solution.

1.20 M = 0.180 mol/0.150 L molarity (M)

We must divide the number of moles of NaCl by the kilogramme mass of the solvent (water) in order to determine the molality of the solution:

moles of NaCl/mass of solvent in kg molality (m) = 0.180 mol/0.147 kg 1.22 m mass of H2O = 147 g = 0.147 kg

Hence, the appropriate values for the solution's molality and molarity are:

M is 1.20 M, while m is 1.22 M.

Learn more about molarity here:

https://brainly.com/question/8732513

#SPJ4

pH affects the solubility of the molecule, which determines the stability of pharmaceuticals, the biological tolerability of the formulation, and the activity of the molecule, pH is a crucial element for all drugs manufactured in aqueous liquid forms.

A solution's pH is a significant indicator of its chemical composition. The pH may impact how readily available nutrients are, how biological processes work, how bacteria behave, and how chemicals behave.

The negative base-10 log of the hydronium ion concentration in a solution is the usual definition of pH value.

In the pharmaceutical sector, we're accustomed to concentrations of little more than 1M under typical circumstances. That being stated, the pH value in that situation may be between two extremes.

Thus, pH is important in Pharmaceutical Practices​.

To learn more about the pH, follow the link;

https://brainly.com/question/15289741

#SPJ9

Answer:

A) The molar mass of SnO₂ is 150.71 g/mol (118.71 g/mol for Sn and 32 g/mol for O). The mass percent of tin in SnO₂ is (118.71 g/mol / 150.71 g/mol) × 100% = 78.76%.

B) The mass of tin in the final sample is 2.842 g.

C) Let x be the mass of tin in the original sample. The mass of oxygen in the original sample is (2.540 g - x). Since tin is oxidized to SnO₂, we can write the equation: Sn + O₂ → SnO₂. The molar ratio of Sn to SnO₂ is 1:1, so the number of moles of Sn in the original sample is the same as the number of moles of SnO₂ in the final sample. Using this, we can set up the following equation:

x / 118.71 g/mol = 2.842 g / 150.71 g/mol

Solving for x, we get x = 1.727 g.

Therefore, the mass of tin in the original sample is 1.727 g, and the mass of oxygen in the original sample is (2.540 g - 1.727 g) = 0.813 g.

D) The mass of oxygen in the original sample is 0.813 g.

E) The number of moles of tin in the original sample is 1.727 g / 118.71 g/mol = 0.0146 mol.

F) The number of moles of oxygen in the original sample is 0.813 g / 32 g/mol = 0.0254 mol.

G) The ratio of tin to oxygen in the original sample can be calculated by dividing the number of moles of tin and oxygen by the smallest of the two:

tin: 0.0146 mol / 0.0146 mol = 1

oxygen: 0.0254 mol / 0.0146 mol ≈ 1.74

We can round this to the nearest whole number, giving a ratio of 1:2. Therefore, the empirical formula of the original oxide of tin is SnO₂.

The solution C has the highest water hardness, measured in milligrammes of calcium ions per litre of water.

Soft water is defined as having a calcium ion level lower than 60 mg/L. And if this occurs between 60 mg/L and 120 mg/L, it is considered moderately hard, between 120 mg/L and 180 mg/L, it is considered hard, and over 180 mg/L, it is considered very hard.

1. Since solution B contains 100 mg, it will be considered MODERATELY HARD.

2. Generally speaking, the conductivity value increases with ion concentration in a solution. Calcium ion concentration is thus highest in solution C. So the answer will be SOLUTION C.

Water hardness is a measure of the amount of dissolved minerals, such as calcium and magnesium, in water. Hard water can cause problems with soap lathering, scaling, and corrosion in pipes and appliances.

Learn more about water hardness here:

https://brainly.com/question/13161362

#SPJ4

The transition that would result in the emission of a photon with the longest wavelength is from n = 4 to n = 3 (Option d).

This is because the energy of a photon is inversely proportional to its wavelength. According to the Rydberg formula, the energy of a photon emitted or absorbed during a transition in a hydrogen atom is given by:

[tex]E = Rh[(1/n_1^2) - (1/n_2^2)][/tex]

where Rh is the Rydberg constant, n1 and n2 are the initial and final quantum numbers of the electron, respectively.

As we move from higher to lower energy levels, the difference in energy levels decreases, resulting in a longer wavelength for the emitted photon. In this case, the transition from n = 4 to n = 3 involves a smaller energy difference than the other transitions given, resulting in the longest wavelength for the emitted photon.

Therefore, the correct answer is option d, n = 4 to n = 3.

Learn more about Rydberg constant :

https://brainly.com/question/17753747

#SPJ4

The macromolecules that are characteristically water insoluble is the correct option is lipids.

The macromolecule are the molecule that are extraordinarily large. They may be organic materials such as the sugars and the natural fibers or the synthetic materials such as the  plastics, the synthetic fibers, Lipids, the proteins, the nucleic, and carbohydrates .  The lipids are water hating. They are water insoluble.

The lipids are the non polar compound and the water is the polar compound. The polar will dissolve the polar compounds and the non polar will dissolves the non polar compound. Therefore the lipids are insoluble in the water.

To learn more about lipids here

https://brainly.com/question/3498396

#SPJ4

Kinetic Versus Thermodynamic Control Furthermore of HBr to Dienes: 1,2-and 1,4-Addition

In the present post we'll talk about 1,2-and 1,4-Addition to dienes - specifically, the expansion of solid corrosive like HBr.

When a diene goes through response with a solid corrosive like HBr, protonation brings about a reverberation settled carbocation

The reverberation settled carbocation can go through assault at two potential positions.

At the point when the response is led at low temperatures, the response is irreversible and the significant item will be the one with the least energy change state, which is the carbon best ready to balance out certain charge.

This is alluded to as running the response under kinetic control.

At the point when the response is directed at higher temperatures, the response is reversible and the significant item will be the one which is generally thermodynamically steady, which is by and large the most-subbed alkene.

This is alluded to as running the response under thermodynamic control.

to know more about thermodynamic click here:

https://brainly.com/question/13059309

#SPJ4

The functional features which the phosphate group contribute to the structure of a phospholipid are:

Phospholipids are derivatives of lipid compounds that contain a phosphate ester group. This compound is one of the building blocks of living cell membranes, along with glycolipids, cholesterol, and proteins. Phospholipids contained in cell membranes belong to the type of phosphoglycerides, which are alcohol and phosphatidic derivatives.

The characteristics of phospholipids are as follows.

Your question is incomplete but most probably your full question was:

What functional features does the phosphate group contribute to the structure of a phospholipid?

Learn more about phosphate group at https://brainly.com/question/8622136

#SPJ4

saturated liquid vapor aka liquid-vapor mixture. A mixture of saturated vapor and liquid is present in this condition. The dryness fraction, a parameter that describes the characteristics of water in this phase, must be calculated is combined with the saturation characteristics.

Vapor pressure is the pressure exerted by a vapor when it is in equilibrium with its liquid or solid phase at a given temperature. It is a measure of the tendency of a substance to evaporate and is a function of the temperature and the strength of the intermolecular forces between the molecules of the substance. At any given temperature, a substance will have a specific vapor pressure. When the vapor pressure of the substance is equal to the external pressure, the substance will begin to boil or evaporate. The vapor pressure of a substance increases with increasing temperature, as the average kinetic energy of the molecules increases and more molecules can escape from the liquid or solid phase and enter the gas phase.

To learn more about vapor pressure, click the link below ;

brainly.com/question/2693029

#SPJ4

The pH of A 400 mL sample of a 0.100 M formate buffer, pH 3.75, is treated with 6 mL of 1.00 M KOH is 4.88

pH buffer = 3.75

pKa  for formic acid is 3.75

Using Henderson-Hasselbalch equation for formate buffer:

pH = pKa + log [ HCOO⁻]

                       [HCOOH]

Input values in above equation

3.75 = 3.75 + log [ HCOO⁻]

                          [HCOOH]

log [ HCOO⁻]  = 0

     [HCOOH]

[ HCOO⁻]  = 1

[HCOOH]

[ HCOO⁻]  = [HCOOH]

Concentration of formate buffer = 0.100 M

[ HCOO⁻]  - [HCOOH] = 0.100 M

[ HCOO⁻]  = [HCOOH] = 0.05 M

As a result, the buffer's volume is the same. As a result, the concentration is calculated as the number of moles of both formate ions and formic acid.

Then we should calculate the number of moles for given molarity

Molarity of solution = moles of solute x 1000

                                volume of solution in mL

1M KOH = moles of KOH x 1000 = 0.006 moles

                        6 mL

The chemical reaction for formic acid and KOH follows the equation:

           HCOOH +KOH ⇒ HCOO⁻ +H₂O

initial     0.05       0.006      0.05

final      0.041           -          0.056

Volume of solution = 400 + 6 = 406 mL = 0.406 L  

We use the Henderson Hasselbalch equation to determine an acidic buffer's pH:

pH = pKa + log [ HCOO⁻]

                       [HCOOH]

[ HCOO⁻] = 0.056 =

                 0.406

[ HCOOH] = 0.041

                   0.406

pH = 3.75 + log [ HCOO⁻]

                       [HCOOH]

pH = 3.75+ log [0.056/ 0.406]

                       [ 0.041/ 0.406]

pH = 4.88

Learn more about pH at https://brainly.com/question/19554913

#SPJ4

The false statement concerning amino groups are nonpolar.

Nitrogen and hydrogen are the two components that make up an amino group. The chemical composition of an amino group is NH2. A single covalent link holds the N-H atoms in this functional group together.

Amines are substances and functional groups in chemistry that have a nitrogen atom that is basic and has a lone pair. Amines are technically ammonia derivatives in which one or more hydrogen atoms have been swapped out for a substituent, like an alkyl or aryl group.

A specific kind of functional group called an amino group is made up of one nitrogen and two hydrogens that are joined by a single covalent link. The chemical structure of the amino group is NH2.

Therefore, the correct answer is option D) They are nonpolar.

The complete question is;

Which of the following is a false statement concerning amino groups?

A) They are basic in pH.

B) They are found in amino acids.

C) They contain nitrogen.

D) They are nonpolar.

E) They are components of urea.

To learn more about amino groups refer to:

https://brainly.com/question/1302816

#SPJ4

Answer:

The pressure of the hydrogen in the container can be determined by using the equation:

P_H2 + ρgh = P_air

where P_H2 is the pressure of the hydrogen, ρ is the density of mercury (13,600 kg/m^3), g is the acceleration due to gravity (9.8 m/s^2), and h is the height difference between the mercury levels in the two arms of the manometer.

First, we need to convert the height difference from millimeters to meters:

h = 78.0 mm = 0.078 m

Next, we can substitute the given values into the equation:

P_H2 + (13,600 kg/m^3)(9.8 m/s^2)(0.078 m) = 100.7 kPa

Solving for P_H2, we get:

P_H2 = 100.7 kPa - (13,600 kg/m^3)(9.8 m/s^2)(0.078 m)

P_H2 = 99.0 kPa

Therefore, the pressure of the hydrogen in the container is 99.0 kPa

The airplane was traveling 100 mph for one hour, but it encountered a north wind of 35 miles per hour then the displacement of the airplane is 117.09 km.

Displacement is defined as a change in an object's position. It is a vector quantity with a magnitude and a direction. It is represented by an arrow pointing from the starting point to the ending point. For instance, if an object moves from A to B, the object's position changes.

Let, Displacement = AC

Distance = AB + BC

By Pythagoras theorem,

AC = √ 100² + 56.32²

= √ 13711.94

Displacement = 117.09 km

Distance = AB + BC

= 100 + 56.32

= 156.32 km

Thus, the displacement of the airplane is 117.09 km.

To learn more about the displacement, follow the link;

https://brainly.com/question/30087445

#SPJ1

The process describing how how electrostatic energy scales with churns separation is given above.

Electrical potential energy is typically stored by separating oppositely-charged particles and storing them on different conductors

Given is to understand how electrostatic energy scales with churns separation.

Therefore, the process describing how how electrostatic energy scales with churns separation is given above.

To solve more questions on  electrostatic energy scaling,  visit the link-

brainly.com/question/29014197

#SPJ1

249. 43 KJ much energy is required to heat 100.0 g H₂O from a liquid at 76°C to a gas at 132°C.

The ability to work is defined as energy. The SI symbol for energy is Joule (J). The different types of energy include thermal energy, chemical energy, electrical energy, light energy, potential energy, kinetic energy, and heat energy. Chemical energy is defined as the power that is held inside chemical compound bonds (molecules and atoms). An exothermic reaction, in which it is released during a chemical reaction, primarily results in the production of heat as a byproduct.

Given that,

mass = 100 gm

c = 4.1843 J/C g

as we know,

q₁ = m × c × ΔT

here, q₁ = heat required to warm water

thus,

or, q₁ = 100 × 4.1843 × (132 - 76)

or, q₁ = 23430 J

Next, q₂ = m × ΔH (vap)

here, q₂ = heat required to vaporize the water

q₂ = 100 × 2260  [As ΔH (vap) = 2260 J/g]

q₂ = 22600 J

Now, energy required (Q) = q₁ + q₂

or, Q = (23430 + 22600) J

or, Q = 249430 J

or, Q = 249.43 KJ

249. 43 KJ much energy is required to heat 100.0 g H₂O from a liquid at 76°C to a gas at 132°C.

To know more about heat refer to:

https://brainly.com/question/25603269

#SPJ1

Energy in terms of Planck's constant can be expressed by the equation: E = hν or E = hc/λ, where E, h, ν, c and λ represent energy, Planck's constant, frequency, speed of light and wavelength, respectively.

The result of multiplying energy by time, or action, is the dimension of Planck's constant. Therefore, the definition of Planck's constant as the fundamental quantum of activity is common.

The Planck-Einstein relation, which establishes Planck's constant, has the following form: E = hf. Here, E denotes the energy of each light packet (or "quanta") in Joules, f is the frequency of light in hertz, and h, of course, denotes Planck's constant.

To learn more about Planck's constant visit:

brainly.com/question/27389304

#SPJ1

Answer:

the first one may be more complex so the second one will be simplified :)

Explanation:

The hilltops and the steepest point of a slope are found in the highest and most closely-spaced contour lines on the map.

Contour lines are lines on a map that connect points of equal elevation. Each contour line represents a specific elevation, and the spacing between contour lines represents the slope of the terrain.

The closer the contour lines are to each other, the steeper the slope. The hilltops are found where the contour lines form a closed circle or oval shape. The steepest point of a slope is found where the contour lines are closest together, indicating the highest rate of change in elevation.

Learn more about contour lines at: https://brainly.com/question/13088900

#SPJ1

When a solution is diluted, the volume of the solution increases, while the amount of solvent remains unchanged. Option c is the correct answer.

When a solution is diluted, the concentration of solute decreases, while the amount of solute remains unchanged. This is because the amount of solute dissolved in the solution does not change when additional solvent is added, but the volume of the solution increases.

As a result, the concentration of the solute in the solution decreases. The volume of the solution increases, while the amount of solvent remains unchanged.

To know more about the solvent, here

brainly.com/question/15212814

#SPJ4

--The complete answer is, When a solution is diluted, the

a. concentration of solute remains unchanged

b. volume of solution remains unchanged

c. amount of solvent remains unchanged

d. amount of solute remains unchanged--