What is the change in enthalpy when 9.00 mol of sulfur trioxide decomposes to sulfur dioxide and oxygen gas?2SO2(g) + O2(g) → 2SO3(g); ΔH° = 198 kJ/mol rxna. 891 kJb. -198 kJc. -891 kJd. 198 kJe. 1782 kJ

When it is possible to write two or more valid electron dot formulas for a molecule or ion, each formula is referred to as a e. resonance structure.

Resonance structures are a way to represent the delocalization of electrons within certain molecules or ions where the bonding cannot be expressed by a single electron dot formula. These structures help to provide a more accurate depiction of the electron distribution within the molecule or ion. Resonance structures do not represent multiple distinct forms of the molecule or ion; rather, they illustrate the possible arrangements of electrons. The true structure is a hybrid of these resonance forms, where electrons are shared among multiple atoms.

It is essential to note that resonance structures do not represent a molecule oscillating between different forms. Instead, they help us understand the electron distribution and stabilization within the molecule or ion. By considering all possible resonance structures, we can gain a better understanding of the molecule's overall stability, bonding properties, and reactivity. When it is possible to write two or more valid electron dot formulas for a molecule or ion, each formula is referred to as a e. resonance structure.

learn more about resonance structure here:

https://brainly.com/question/30439335

#SPJ11

The correct option is b. Any water that, according to recognized standards, is safe for consumption

Potable water is water that is considered safe and suitable for human consumption according to recognized standards. This means that the water has been treated and tested to ensure that it is free from harmful contaminants and meets specific quality criteria for drinking water.

Potable water is typically treated to remove contaminants such as bacteria, viruses, parasites, chemicals, and other substances that may be harmful to human health. It is an essential resource for human health and well-being, and access to safe and reliable potable water is a basic human right. Therefore option b is right answer.

For more question on water click on

https://brainly.com/question/568323

#SPJ11

A polyatomic ion is a tightly packed, positively or negatively charged group of atoms that behaves like a unit. So, the third option is correct.

A polyatomic ion is a tightly packed group of atoms, either positively or negatively charged, that behaves like a unit. A tightly packed group of atoms that act as a unit and carry electrical charges. The atomic groups all follow a species that forms ionic compounds with oppositely charged ions. They form a stable group that carries electrical charges.

For more information about polyatomic ion, refer:

https://brainly.com/question/13659069

#SPJ4

The equilibrium constant for the reaction is 28.44.

The equilibrium constant expression for the reaction is:

[tex]Kc = [C][D]/([A]^2[B]^3)[/tex]

where [A], [B], [C], and [D] are the molar concentrations of the respective species at equilibrium.

At the start of the reaction, the initial concentrations of A and B are:

[A] = 2.0 moles / 2.00 L = 1.0 M

[B] = 3.0 moles / 2.00 L = 1.5 M

At equilibrium, the concentration of A is 0.400 mol / 2.00 L = 0.200 M.

We can use these initial and equilibrium concentrations to find the equilibrium concentration of C and D:

[C] = [D] = (2.0 - 0.400) mol / 2.00 L = 0.800 M

Now we can substitute these concentrations into the equilibrium constant expression:

[tex]Kc = [C][D]/([A]^2[B]^3)[/tex]

[tex]= (0.800 M)^2 / (0.200 M)^2 (1.5 M)^3[/tex]

= 28.44

For more question on equilibrium click on

https://brainly.com/question/19340344

#SPJ11

The type of bond in which only one of the atoms in a bond provides the pair of bonding electrons is called a "coordinate covalent bond".

The type of bond in which only one of the atoms in a bond provides the pair of bonding electrons is called a "coordinate covalent bond". In a coordinate covalent bond, one atom contributes both electrons to the bond while the other atom does not contribute any electrons. This is in contrast to a normal covalent bond, where each atom contributes one electron to the shared pair.

Coordinate covalent bonds are also known as "dative bonds" or "Lewis acid-base bonds", named after Gilbert N. Lewis, who first described this type of bonding in the early 20th century. These bonds are commonly found in molecules containing Lewis acids and bases, such as metal complexes, transition metal compounds, and some organic molecules.

In a coordinate covalent bond, the atom donating the electron pair is called the "donor" or "Lewis base", while the atom accepting the electron pair is called the "acceptor" or "Lewis acid". The Lewis base donates a lone pair of electrons to the Lewis acid, which uses them to form the bond.

One example of a coordinate covalent bond is the bond between the nitrogen atom and oxygen atom in the nitrate ion (NO3-). In this case, one of the oxygen atoms donates a lone pair of electrons to the nitrogen atom, forming a coordinate covalent bond.

Learn more about coordinate covalent bond

brainly.com/question/12857081

#SPJ11

The balanced reaction that describes the process of aluminum metal reacting with nitric acid to produce aluminum nitrate and hydrogen gas is:
2Al + 6HNO3 -> 2Al(NO3)3 + 3H2

Due to the fact that hydrogen is not a powerful enough reducing agent to completely eliminate the oxygen from the solid aluminium oxide, it cannot react with hydrogen gas to form molten aluminium and water.Aluminium, on the other hand, cannot be replaced by hydrogen in a solution because it is more reactive than hydrogen.Due to the fact that hydrogen is not a powerful enough reducing agent to completely eliminate the oxygen from the solid aluminium oxide, it cannot react with hydrogen gas to form molten aluminium and water.Aluminium, on the other hand, cannot be replaced by hydrogen in a solution because it is more reactive than hydrogen.

Learn more about aluminum  here

https://brainly.com/question/5704856

#SPJ11

The volume of the balloon after heating will be approximately 13.9 liters.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance, such as a gas, liquid, or solid. It is a scalar quantity that determines the direction of heat flow between two substances when they are in contact, with heat flowing from a substance with higher temperature to a substance with lower temperature until they reach thermal equilibrium.

The volume of a gas is directly proportional to its temperature (assuming constant pressure), according to the ideal gas law. The ideal gas law is given by the equation:

PV = nRT

where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

To solve this problem, we can convert the temperatures from Celsius to Kelvin by adding 273.15 to each temperature.

Initial volume of balloon (V1) = 9.2 liters

Initial temperature of balloon (T1) = 28.9°C + 273.15 = 302.05 K

Final temperature of balloon (T2) = 183.0°C + 273.15 = 456.15 K

We can set up a proportion using the initial and final temperatures:

(V1 / T1) = (V2 / T2)

Plugging in the known values:

(9.2 / 302.05) = (V2 / 456.15)

Now we can solve for V2, the final volume of the balloon after heating:

V2 = (9.2 / 302.05) * 456.15

V2 = 13.9 liters (rounded to one decimal place)

Learn more about Temperature from the given link

https://brainly.com/question/27944554

#SPJ1

In the reaction involving 1,4-di-t-butyl-2,5-dimethoxybenzene, the preferred product is formed due to steric hindrance and the directing effect of methoxy groups.

The methoxy groups are electron-donating and direct electrophilic substitution to the ortho and para positions. The 1,4-di-t-butyl-2,5-dimethoxybenzene (para product) is favored over 1,2-di-t-butyl-3,6-dimethoxybenzene (ortho product) and 1,3-di-t-butyl-3,6-dimethoxybenzene (meta product) because the bulky tert-butyl groups are placed further apart, minimizing steric hindrance. In the ortho and meta products, the tert-butyl groups are closer together, causing greater steric repulsion and making them less favored.

Learn more about electron here: https://brainly.com/question/1255220

#SPJ11

By the time it's fusing iron, a star is in its death throes. It begins to collapse, and if it's massive enough, that collapse leads to a powerful explosion called a supernova.

The collapse of a star that has reached the stage of fusing iron in its core leads to a cataclysmic event known as a supernova. This explosion releases an immense amount of energy, outshining an entire galaxy for a short period of time. The core collapses inward, causing protons and electrons to merge and form neutrons, resulting in an ultra-dense neutron star or possibly a black hole. Supernovae are crucial for the universe, as they distribute heavy elements that are vital for the formation of new stars, planets, and even life itself.

learn more about Fusing iron here:

https://brainly.com/question/2984115

#SPJ11

Many moles of chlorine gas reacts with 1 mol of hydrogen gas is 1 mol.

According to the balanced chemical equation:

H₂(g) + Cl₂(g) → 2 HCl(g)

1 mole of hydrogen gas reacts with 1 mole of chlorine gas to produce 2 moles of hydrogen chloride gas. Therefore, if we want to know how many moles of chlorine gas react with 1 mole of hydrogen gas, we can use the stoichiometric ratio of the balanced equation, which is 1:1 for H₂ and Cl₂.

This means that for every 1 mole of hydrogen gas, we need 1 mole of chlorine gas to react completely and produce 2 moles of hydrogen chloride gas.

Learn more about moles at https://brainly.com/question/29367909

#SPJ11

The pieces of metal that are designed to corrode instead of the facility they are designed to protect are called Sacrificial anodes.

The essential element of a galvanic cathodic protection system used to shield buried or submerged metal structures from corrosion is a galvanic anode, often known as a sacrificial anode.

They are created from an alloy of metal that has a higher "active" voltage (more positive electrode potential/more negative reduction potential) than the metal used for the structure. Since the two metals have different potentials, the galvanic anode corrodes and is essentially "sacrificed" to safeguard the structure.

Metal surfaces experience corrosion, an electrochemical process, when they come into contact with electrolytes. Corrosion is the process of converting a metal back to its original form as an ore; during this transformation, the metal disintegrates and loses structural integrity. Pipelines, structures, and ships all make use of these metal surfaces. It is crucial to make sure that these metals endure as long as possible, which calls for cathode protection.

Several methods of cathode protection include the use of sacrifice anodes. Additional methods of cathode protection include:

Learn more about Sacrificial anodes:

https://brainly.com/question/31520156

#SPJ4

When PVC pipe is stacked loose, it should not be stacked more than 5.0 feet high. The correct answer is option c.

Stacking PVC pipe loosely means that the pipes are not secured or fastened together, and they are simply placed one on top of the other. It is important to stack PVC pipe correctly to prevent damage to the pipes and ensure safety in the workplace.

If PVC pipes are stacked too high, they can become unstable and fall over, which can result in injury to workers or damage to the pipes. Additionally, the weight of the pipes can cause the bottom pipes to become compressed or deformed, leading to leaks or cracks.

To prevent these issues, it is recommended to stack PVC pipes in a stable and organized manner. This can be achieved by using racks or pallets, securing the pipes together with straps or bands, and labeling the stacks for easy identification. By following these guidelines, you can ensure that your PVC pipes are stored safely and securely.

Therefore, option c is correct.

For more such questions on PVC pipe, click on:

https://brainly.com/question/1796072

#SPJ11

Benzaldehyde is a common carbonyl compound used as a starting material in aldol condensation reactions.

In this reaction, benzaldehyde is deprotonated by a base, typically hydroxide, to form the benzaldehyde enolate, which is a nucleophile. The enolate then attacks the carbonyl carbon of another aldehyde or ketone, forming a carbon-carbon bond and creating a β-hydroxy carbonyl compound, also known as an aldol.

This aldol product can then undergo dehydration to form an α,β-unsaturated carbonyl compound. Overall, benzaldehyde serves as both a reactant and a source of the nucleophilic benzaldehyde enolate in the aldol condensation.

Learn more about Benzaldehyde

https://brainly.com/question/31392174

#SPJ4

D) 2.05 g N. The molar mass of N2H4 is 32.045 g/mol. To calculate the mass of N in 2.34 g of N2H4, we need to first calculate the number of moles of N2H4:

moles of N2H4 = (mass of N2H4) / (molar mass of N2H4)
moles of N2H4 = 2.34 g / 32.045 g/mol
moles of N2H4 = 0.073 mol

Since there are two N atoms in one N2H4 molecule, we need to multiply the number of moles of N2H4 by 2 to get the number of moles of N:

moles of N = 2 x moles of N2H4
moles of N = 2 x 0.073 mol
moles of N = 0.146 mol

Finally, we can calculate the mass of N:

mass of N = (moles of N) x (molar mass of N)
mass of N = 0.146 mol x 14.007 g/mol
mass of N = 2.05 g

Find out more about molar mass

brainly.com/question/30892478

#SPJ11

There are no ions present in the compound CH4. The correct answer is option E.

The compound CH4 is methane, which is a covalent compound composed of one carbon atom and four hydrogen atoms. Since it is a covalent compound, it does not ionize in water to form ions. Therefore, there are no ions present in the compound CH4.

In covalent compounds, atoms share electrons to achieve a stable electron configuration. In the case of methane, the four valence electrons of carbon are shared with the valence electrons of the four hydrogen atoms, forming four covalent bonds. This results in a stable molecule with no net charge and no ions present.

It is important to note that while there are no ions present in methane, it can still participate in chemical reactions. For example, it can undergo combustion with oxygen to produce carbon dioxide and water vapor, a process that is important in many industrial and natural processes.

Therefore, option E is correct.

For more such questions on methane, click on:

https://brainly.com/question/25649765

#SPJ11

Your body composition is about 18.5% carbon and 3.3% nitrogen.

To explain further, body composition refers to the different components that make up the body, such as fat, muscle, bones, and organs. Carbon and nitrogen are two elements that can be found in the body, with carbon being a major component of all organic molecules, including carbohydrates, fats, and proteins, while nitrogen is essential for building proteins and nucleic acids. Knowing the percentages of carbon and nitrogen in the body can provide insight into overall health and nutrition.

The human body is made up of six elements, including oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus, making up about 99% of its mass. The remaining five elements, potassium, sulphur, sodium, chlorine, and magnesium, make up only around 0.85% of the total composition. Life need all 11 of them. The remaining elements are trace elements, of which more than a dozen are believed to be required for life on the basis of strong evidence. The body mass of magnesium, the least prevalent of the 11 non-trace elements, is not equal to the combined mass of the trace elements (less than 10 grammes for a human body).

To  know more about  body composition click here:

https://brainly.com/question/4821236

#SPJ11

The molar mass of Ba(NO3)2 is approximately 261.35 g/mol, which corresponds to option D.

To calculate the molar mass of Ba(NO3)2, we need to add up the atomic masses of all the atoms present in one mole of the compound:

Ba(NO3)2 = Ba + 2(NO3)

[tex]= 137.33 g/mol + 2(14.01 g/mol + 3(16.00 g/mol))= 137.33 g/mol + 2(14.01 g/mol + 48.00 g/mol)= 137.33 g/mol + 124.02 g/mol[/tex]

= 261.35 g/mol. The molar mass is an important concept in chemistry as it allows us to easily convert between mass and moles of a substance. This is useful for determining the amount of a substance needed for a chemical reaction, for calculating the concentration of a solution, and for other applications.

Learn more about the molar mass here:

https://brainly.com/question/29202809

#SPJ11

So, at 5 degrees Celsius, h2o2 decomposes.

Celsius is denoted by the symbol °C. Anders Celsius (1701–1744), a Swedish physicist, was honoured by having this temperature scale created and given his name in 1742.ΔG = -37.77 kJ - (248.15 K)(-130.92 J/K)ΔG = -37.77 kJ + 32.45 kJΔG = -5.32 kJ/mol

There are several nations that utilise the Celsius scale (sometimes known as centigrade) to measure temperature. A Swedish astronomer by the name of Anders Celsius invented the Celsius scale. The melting point of pure water at sea level, under normal pressure, is 0 degrees (°) Celsius on the thermometer.

To know more about Celsius visit:

https://brainly.com/question/14009365

#SPJ1

Flammable gas, flammable liquid-produced vapor, or combustible liquid-produced vapor mixed with air may burn in air known as material's flash point.

The lowest temperature at which enough vapor is present to form a flammable mixture with air is called  the material's flash point. These vapors  are usually formed near the surface of the material. Flammable liquids and gases are those which undergoes combustion and my get ignited in presence of an ignition source.

Flammable liquids possesses a flash point  less than 100°F. Liquids with lower flash points tend to ignite easily. The  combustible liquids have a flashpoint above 100°F. The vapor burns, not the liquid itself.

To know more about flammable liquid here

https://brainly.com/question/8991581

#SPJ4

The question should be

Flammable gas, flammable liquid-produced vapor, or combustible liquid-produced vapor mixed with air may burn in air known as material's ____

To calculate the error associated with the given calculation, we need to use the formula for error propagation. This formula tells us how uncertainties in the input values affect the uncertainty in the output value.

The formula for the error propagation in the case of addition and subtraction is:

δf = sqrt(δA^2 + δB^2 + δC^2 + δD^2 + δE^2)

where δf is the uncertainty in the output value, and δA, δB, δC, δD, and δE are the uncertainties in the input values.

Using the given values for A, B, C, D, and E, we can calculate the uncertainty in the output value:

δA = 0.02

δB = 2.68

δC = 2.57

δD = 0.0257

δE = 0.8

A+B-C CBD + E +B² = 12.36 + 125.03 - 100.32*5.2483 + 2.5 + 125.03^2

= -25575.2927

δf = sqrt(δA^2 + δB^2 + δC^2 + δD^2 + δE^2)

= sqrt(0.02^2 + 2.68^2 + 2.57^2 + 0.0257^2 + 0.8^2)

= 3.548

Therefore, the error associated with the given calculation is 3.548. We can express the final result as:

A+B-C CBD + E +B² = -25575.29 ± 3.55.

Answer:

I think the answer will be 3.487

16.95g is the mass of ethanol (C2H60) that are required to produce 1,000 kJ during boiling? The heat of vaporization of ethanol is 38.6 kJ / mole.

The most fundamental characteristic of matter is mass, which is one of the basic quantities in physics. Mass is a term used to describe how much matter is there in a body. The kilogramme (kg) is the international standard of mass. A nuclear reaction, for instance, results in the total weight of the substance being reduced as a tiny quantity of matter is transformed into a very large amount of energy.

moles of ethanol = 38.6/  1,000=0.368moles

molecular weight of ethanol =46.07g/mol

mass = 0.368×46.07

         = 16.95g

To know more about mass, here:

https://brainly.com/question/28704035

#SPJ1

.A. Ionization energy is commonly expressed as the energy required to remove an electron from each atom in exactly 1 mole of atoms all the options that correctly describe ionization energy (IE) and/or its role in chemical reactivity

More energy must be released for each additional electron. Because the atom's overall charge changes to positive after the first electron is gone, the negative forces of the remaining electrons will be drawn to the positive charge of the newly created ion.

The amount of energy needed to expel the highest-energy electron from a neutral atom is known as the ionisation energy (IE). Ionisation energy often rises over a time and falls over a group. Effective nuclear charge rises with time while electron shielding stays constant.

learn more about ionisation energy

https://brainly.com/question/20658080

#SPJ1

The amount of chlorine added to water minus its chlorine residual equals: b) The chlorine demand

The difference between the amount of chlorine applied to water or wastewater and the amount of residual chlorine left after a specific contact time is known as chlorine demand. With dosage, time, temperature, pH, and the kind and quantity of contaminants in the water, chlorine demand may alter.

Chlorine Demand = Chlorine Applied - Chlorine Residue

The correct answer is, The amount of chlorine added to water minus its chlorine residual equals: b) The chlorine demand

To know more about chlorine click here:

https://brainly.com/question/30831426

#SPJ11

The best way for an elementary school teacher to use an interactive simulation showing drawn molecules in a phase change from a liquid to a gas is to emphasizing that the molecules are still there, but they are now in a different phase.

The teacher can explain that when a liquid is heated, the molecules gain energy and move faster, eventually becoming a gas. The interactive simulation can show the molecules moving faster and farther apart as they transition from a liquid to a gas. By emphasizing that the molecules are still present, even though they are now in a different phase, students will better understand the concept of phase changes and that matter can exist in different phases (solid, liquid, and gas) depending on the amount of energy it possesses.

an elementary school teacher can follow these steps: 1. Begin with a clear representation of liquid molecules, showing them closely packed together but with some movement. 2. Gradually increase the kinetic energy of the molecules, simulating the effect of heating the liquid. 3. As the energy increases, show the molecules moving faster and spreading apart, transitioning into the gas phase. 4. Emphasize that the liquid is not disappearing, but rather changing into a different state with more space between molecules. 5. Allow students to interact with the simulation by adjusting temperature or pressure, observing how these factors influence the phase change.

Forces of attraction dictate that a material's intermolecular forces of attraction are stronger in a substance with a higher melting point than they are in a substance with a lower melting point.

Learn more about intermolecular forces  here

https://brainly.com/question/30505114

#SPJ11

The table in above figure shows the difference between the IR spectrum of ketone product, and that of the alcohol starting material.

Infrared spectroscopy (IR) involves the interaction of infrared radiation with matter. Functional groups will behave (vibrate, stretch, flex, wiggle, basically move around) at different wavelength ranges based on the type of functional group. This can be used to identify and study chemical substances. The width and location of the peak in an IR is indicative of what functional group caused it. Alcohol and carboxylic acid peaks are very broad verses carbonyl peaks which are very narrow and sharp. Substituted benzene rings have peaks that correspond to the substitution pattern (mono, para, meta, etc.) in the fingerprint and overtone regions of the IR. The above table describes the difference between the ketone and alcoholic products.

For more information about IR spectrum, visit :

https://brainly.com/question/21134950

#SPJ4

The reactions of oxidative catabolism or aerobic respiration can occur in the mitochondria only in the presence of oxygen.

The reactions of oxidative catabolism, also known as aerobic respiration, take place in the mitochondria of cells. These reactions require a specific element to generate energy in the form of ATP (adenosine triphosphate). Aerobic respiration involves three main stages: glycolysis, the citric acid cycle, and the electron transport chain.

In the presence of oxygen, the final stage of aerobic respiration, the electron transport chain, occurs. Oxygen acts as the final electron acceptor in this process and is essential for the completion of the entire oxidative catabolism. When oxygen is present, a series of redox reactions occur in the inner mitochondrial membrane, which ultimately leads to the production of ATP.

In contrast, an alkaline pH, hydrogen ions, and carbon dioxide are not specifically required for aerobic respiration to take place. While pH and hydrogen ions are involved in maintaining the proper environment within cells, they are not the determining factor for the occurrence of oxidative catabolism. Similarly, carbon dioxide is a byproduct of the citric acid cycle, but it does not initiate the process.

For more such questions on aerobic respiration, click on:

https://brainly.com/question/12605249

#SPJ11

D. Water-cement ratio is the principal determinant of concrete strength.

The water-cement ratio is the ratio of the weight of water to the weight of cement in a concrete mix. It has a significant impact on the strength and durability of concrete. When the water-cement ratio is high, the concrete will have more water and less cement, resulting in weaker concrete with lower durability. Conversely, a lower water-cement ratio will result in stronger, more durable concrete. The amount of air entrained, the type of Portland cement used, and the volume of aggregate in the mix can all influence the strength of concrete to some extent, but the water-cement ratio is the most critical factor. To achieve the desirable strength and durability of concrete, it's essential to use an appropriate water-cement ratio in the mix.

Learn more about concrete strength here:

https://brainly.com/question/23126877

#SPJ11

The correct answer is D. The formation of tracks or fissures in solid curds indicates that gaseous end-products have been formed during litmus milk reactions.

This is because the gaseous end-products cause the curds to shrink and create openings in the solid curds.

A color change to pink or deep blue and a translucent, brown, wheylike appearance in the media do not necessarily indicate the formation of gaseous end-products. Milk provides lactose, casein, lactalbumin, and lactoglobulin. 3 In an acid solution litmus is red and under alkaline conditions it is blue When an organism ferments lactose, lactic acid is produced and the medium changes to a pink-red color.

To know more about litmus milk reactions click here:

https://brainly.com/question/29738590

#SPJ11

A monoprotic weak acid is dissolved in water to produce a 0.0154 M solution. The pH of the resulting solution is 2.47 .  2.6 x 10⁻⁴ is the Ka for the acid.

For the first question, we can use the Henderson-Hasselbalch equation:

[tex]pH=pKa+log\frac{[base]}{[acid]}[/tex]
Where pKa is the dissociation constant of the weak acid and [base] and [acid] are the concentrations of the conjugate base and weak acid, respectively.
Plugging in the values given, we get:
pH = 4.09 + log(0.510/0.110)
pH = 4.74
Therefore, the pH of the buffer solution is 4.74.
For the second question, we can use the equation for the dissociation constant of a weak acid:
[tex]Ka=\frac{[H+][A-]}{[HA]}[/tex]
Where [H+], [A-], and [HA] are the concentrations of hydronium ions, conjugate base, and weak acid, respectively.
We are given the pH, which can be used to find [H+]:

[tex]pH=-log[H+][/tex]
2.47 = -log[H+]
[H+] = 2.0 x 10⁻³ M
We are also given the concentration of the weak acid, [HA], which is 0.0154 M.
Using the fact that the weak acid is monoprotic and therefore that [H+] = [A-], we can find [A-]:
[A-] = 2.0 x 10⁻³ M
Now we can plug in these values to find Ka:
Ka = (2.0 x 10⁻³)² / 0.0154
Ka = 2.6 x 10⁻⁴
Therefore, the Ka for the acid is 2.6 x 10⁻⁴.

Learn more about conjugate base here

https://brainly.com/question/28545620

#SPJ11

To calculate the number of grams of nitrogen in 7.5 g of Ca(NO3)2, we need to first determine the molar mass of Ca(NO3)2 and the molar mass of nitrogen.

The molar mass of Ca(NO3)2 is:

Ca: 1 x 40.08 g/mol = 40.08 g/mol

N: 2 x 14.01 g/mol = 28.02 g/mol

O: 6 x 16.00 g/mol = 96.00 g/mol

Total molar mass = 164.10 g/mol

We can use the molar mass to The molar mass of Ca(NO3)2 is:

Ca: 1 x 40.08 g/mol = 40.08 g/mol

N: 2 x 14.01 g/mol = 28.02 g/mol

O: 6 x 16.00 g/mol = 96.00 g/mol

Total molar mass = 164.10 g/mol

We can use the molar mass to convert 7.5 g of Ca(NO3)2 to moles of nitrogen:

7.5 g Ca(NO3)2 x (1 mol Ca(NO3)2 / 164.10 g Ca(NO3)2) x (2 mol N / 1 mol Ca(NO3)2) = 0.0913 mol N

Finally, we can convert moles of nitrogen to grams of nitrogen:

0.0913 mol N x 14.01 g/mol = 1.28 g N

Therefore, there are 1.28 g of nitrogen in 7.5 g of Ca(NO3)2. Answer B) 1.3 g is the closest option.

Finally, we can convert moles of nitrogen to grams of nitrogen:

0.0913 mol N x 14.01 g/mol = 1.28 g N

Therefore, there are 1.28 g of nitrogen in 7.5 g of Ca(NO3)2. Answer B) 1.3 g is the closest option.

Learn more about molar mass here:

https://brainly.com/question/22997914

#SPJ11