how many moles of iron are present in 3.15 × 1024 atoms of iron? avogadro's number : 1 mol = 6.02x1023 particles

Answer:

0.010204583427424 per 1 gram.

0.01 moles Phosphoric Acid ⇒ 1.0000000000000153 gram(1 gram of acid)

I hope this answers your question! Have a great day.

The percent yield using KBr would be 80.6%, which is different from the percent yield using NaCl (88.5%).

In part 2, step 1 of the experiment, we react [Fe(phen)₃]Cl₂ with NaBr to obtain [Fe(phen)₃]Br₂ and NaCl. If we were to use an excess of KBr instead of NaCl, the reaction would proceed as follows:

[Fe(phen)₃]Cl₂ + 2KBr → [Fe(phen)₃]Br₂ + 2KCl

In this case, the product we would obtain is still [Fe(phen)₃]Br₂, but the byproduct would be KCl instead of NaCl.

Now, let's consider the theoretical yield and percent yield. The theoretical yield is the amount of product that would be obtained if the reaction proceeded perfectly, without any loss of material. The percent yield is the actual yield (the amount of product obtained in the experiment) expressed as a percentage of the theoretical yield.

Since we are assuming that we isolated the same amount of product in grams as the original experiment, the actual yield would be the same. However, the theoretical yield would be different because the molar mass of KBr is different from that of NaCl. Therefore, the amount of [Fe(phen)₃]Br₂ that would be obtained from a given amount of KBr would be different from the amount obtained from the same amount of NaCl.

To calculate the new theoretical yield and percent yield, we need to know the amount of KBr used in the experiment. Let's assume that we used 2.0 grams of KBr.

The molar mass of KBr is 119.0 g/mol, so the moles of KBr used in the experiment would be;

2.0 g KBr / 119.0 g/mol = 0.0168 mol KBr

From the balanced equation, we can see that the stoichiometry of the reaction is 1:1 between [Fe(phen)₃]Cl₂ and NaCl or KBr. Therefore, the moles of [Fe(phen)₃]Br₂ that would be obtained from 0.0168 mol of KBr would be;

0.0168 mol [Fe(phen)₃]Br₂ / 1 mol KBr = 0.0168 mol [Fe(phen)₃]Br₂

The molar mass of [Fe(phen)₃]Br₂ is 740.2 g/mol, so the theoretical yield of [Fe(phen)₃]Br₂ would be:

0.0168 mol [Fe(phen)₃]Br₂ × 740.2 g/mol = 12.4 g [Fe(phen)₃]Br₂

Therefore, the theoretical yield of [Fe(phen)₃]Br₂ using KBr would be 12.4 grams, which is different from the theoretical yield using NaCl (11.3 grams).

To calculate the new percent yield, we need to divide the actual yield (let's assume it's 10.0 grams) by the new theoretical yield (12.4 grams) and multiply by 100;

Percent yield=(actual yield/theoretical yield) × 100

Percent yield = (10.0 g / 12.4 g) × 100

Percent yield = 80.6%

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The element with lowest electronegativity, based on periodic trends, is Li. An atom's electronegativity is measured.

Atomic radius, ionisation energy, electron attraction, electronegativity, valency, and metallic nature are important periodic trends. Due to the periodic nature of the elements and their similar electrical configurations within their various groups or periods, these tendencies are present.

The number of protons on the nucleus, the number of energetic levels, & the shielding effect are three variables that aid in the prediction of trends in the periodic table. In any group, the atomic radii get larger from top to bottom.

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The rate of heat flow by conduction through the glass window is 11.4 W.

The rate of heat flow by conduction through a glass window 2.0 m x 1.5 m in area and 3.6 mm thick , if the temperature at the inner and outer surface is 15.0°C and -5.0°C, respectively, is 11.4 W.

The rate of heat flow by conduction is given by the following equation:

Q = k * A * (T1 - T2) / d

where:

Q is the rate of heat flow (in watts)

k is the thermal conductivity of the material (in watts per meter per degree Celsius)

A is the area of the surface (in square meters)

T1 is the temperature on the hot side (in degrees Celsius)

T2 is the temperature on the cold side (in degrees Celsius)

d is the thickness of the material (in meters)

For this problem, we have:

k = 0.84 W/m/°C

A = 2.0 m x 1.5 m = 3.0 m²

T1 = 15.0°C

T2 = -5.0°C

d = 3.6 mm = 0.0036 m

Plugging these values into the equation, we get:

Q = 0.84 W/m/°C * 3.0 m² * (15.0°C - (-5.0°C)) / 0.0036 m = 11.4 W

Therefore, the rate of heat flow by conduction through the glass window is 11.4 W.

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The compounds of ionic substances with the most exothermic lattice energy are:

Correct answer: letters B, C y D.

This is because these ionic substances have the most exothermic lattice energy because they form ionic bonds, which are very strong, and these three alkali metals are in the first row of the periodic table.

The compounds of ionic substances with the most exothermic lattice energy are those in which the ions have the largest difference in electronegativity.

The lattice energy of an ionic substance is the energy required to completely separate the ions in the solid state. The compound with the most exothermic lattice energy is the one that is the most stable. In general, the larger the ionic radius, the more exothermic the lattice energy.

Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy?

Group of answer choices:

a) NaCl, KCl

b) LiF, LiCl

c) Mg(OH) 2, MgO

d) Fe(OH) 2, Fe(OH) 3

e) NaCl, Na 2

​f) MgO, BaS

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Salt suitable for sprinkling on food at meals.

Answer: DNA sequencing methods employ chain termination nucleotides. Furthermore, if two chain-terminating nucleotides are employed in the same well, determining which strand is ended by which dideoxynucleotide will be impossible.

(its my own words, but i did search it to get this answer, hope it helps!)

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The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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Answer:

Here is a sample sale pitch poster about solar energy:

"Go Solar with Confidence!

Are you tired of rising energy costs and looking for a more sustainable solution? Solar energy is the answer!

Pros:

Solar energy is a clean and renewable source of electricity. It doesn't produce any harmful greenhouse gases or pollutants, making it a great choice for the environment.

Solar panels are easy to install and maintain, with a lifespan of 25-30 years.

Solar energy can save you money on your energy bills, especially if you live in a sunny location.

Cons:

The initial cost of installing solar panels can be high, although there are various financing options available to help offset this expense.

Solar energy is not always reliable, as it depends on the availability of sunlight. However, advances in solar panel technology have made it possible to generate electricity even on cloudy days.

Why is it great?

Solar energy is a reliable and cost-effective way to generate electricity for your home or business. It can help you reduce your carbon footprint and protect the environment for future generations.

Why is it bad?

The upfront cost of installing solar panels can be a barrier for some people. However, the long-term financial benefits of switching to solar energy can far outweigh this initial investment.

Can you overcome those downfalls?

Yes, by exploring financing options and taking advantage of government incentives and rebates, you can make the switch to solar energy more affordable.

Be to the point:

Solar energy is a clean, renewable, and cost-effective way to generate electricity. It has a long lifespan and can save you money on your energy bills. Don't wait any longer - make the switch to solar today!"

The long-chain molecules that consist of many repeating units are called polymers. Polymers are large macromolecules composed of monomer units that are chemically bonded together in a repetitive pattern.

The repeating units, also known as monomers, are linked through covalent bonds, creating a chain-like structure.

Polymers can have various sizes and complexity, ranging from simple structures like polyethylene to highly intricate and specialized macromolecules like proteins and DNA.

It is noticed that due to their repeating nature, polymers often possess unique physical and chemical properties, making them useful in a wide range of applications, including plastics, textiles, adhesives, and biomedical materials.

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The functional group of alcohol and phenol is the correct option is A) −OH Phenol and Alcohol.

The hydroxyl group that is ,- OH is found in the alcohol compound and the phenol as the functional groups. Alcohols and the phenols are classified in to the  mono–, di–, tri- or the polyhydric compounds . This is based on the one, two , the three or the many hydroxyl groups.

The Alcohols are the mostly colorless, and alcohols are usually exist in the state of the liquid state. The Phenols are the colorless solids which is usually exist in the form of the  crystals at the STP.

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Answer:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

Explanation:

Answer:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit .

Answer:

Explanation:

The Hawaiian Islands were literally created from lots of volcanoes—they're a trail of volcanic eruptions. In the case of the Hawaiian Islands, the Pacific Plate is continually moving to the northwest over the Hawaiian hot spot. This movement caused the Hawaiian chain of islands to form.

The order of decreasing sn² reactivity with NaCN is: bromoethane > 1-chloro-3,3-dimethylpentane > 1-chloro-2,2-dimethylpentane > 2-bromo-2-methylpentane.

The order of decreasing sn² reactivity with NaCN can be determined by looking at the stability of the resulting carbon ion intermediate. The more stable the intermediate, the less reactive the substrate will be. The order from most reactive to least reactive is as follows: bromoethane, 1-chloro-3,3-dimethylpentane, 1-chloro-2,2-dimethylpentane, and 2-bromo-2-methylpentane.

Bromoethane is the most reactive because the resulting carbon ion intermediate is stabilized by the electron-withdrawing effect of the bromine atom. Next, 1-chloro-3,3-dimethylpentane is more reactive than 1-chloro-2,2-dimethylpentane because the bulky methyl groups on the 2 position of the latter substrate cause steric hindrance and reduce reactivity. Finally, 2-bromo-2-methylpentane is the least reactive because the resulting carbon ion intermediate is stabilized by both the bromine atom and the bulky methyl group, making it the most stable of the substrates listed.

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Hydronic heating systems, once assembled, must be filled purged of air and filled with fluid. an  air separator is specifically designed for this purpose.

Hydronic heating systems use water or other fluids to distribute heat throughout a building. During the initial setup or maintenance of these systems, it is crucial to remove any trapped air and fill the system with fluid to ensure proper functioning. This is where an air separator comes into play.

An air separator is a device designed to eliminate or separate air bubbles or pockets from the fluid circulating in the hydronic heating system. It is typically installed at strategic points in the system, such as near the boiler or in the supply/return lines.

As the fluid flows through the air separator, it slows down, allowing any air bubbles to rise to the top and be vented out, while the fluid continues its path unobstructed.

By purging air and ensuring the system is filled with fluid, the air separator helps prevent issues such as reduced heat transfer efficiency, noise, and potential damage to system components caused by air pockets. It plays a crucial role in maintaining the performance and longevity of hydronic heating systems.

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Answer:

B: +3

Explanation:

If Gallium loses 3 electrons, it will become an ion.

The ion will be positively charged because in this new ion, the number of electrons is lesser than the number of protons. The charge difference will impart a positive net charge on the ion.

If Gallium the loss of 3 electrons offsets the charge balance in the chemical specie. Thus, the ion will have a net +3 charge.

The receptor type used to detect decreases in temperature from 35°C to 20°C is the cold receptors.

Cold receptors are specialized nerve endings located throughout the body that detect changes in temperature. These receptors send signals to the brain, which then determines whether the environment is too hot or too cold.

Cold receptors are sensitive to temperatures below the body's normal temperature and act as an alert system for the body in order for it to respond and adjust to colder temperatures. The receptors are activated when temperatures are lower than the body's normal temperature and send signals to the brain to activate the body's cooling mechanisms.

The receptors can also detect sudden drops in temperature, such as when a person is exposed to chilly air. In order to protect against the cold, the body will start to shiver, as well as produce sweat and heat up the muscles. Cold receptors are important for the body to detect temperature changes and protect it from the cold.

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Total, 0.046 grams of helium gas occupy 344 mL at 688 mmHg and 36 degrees Celsius.

To solve this problem, we can use the ideal gas law;

PV = nRT

Where;

P = pressure = 688 mmHg

V = volume = 344 mL

n = number of moles of gas

R = gas constant = 0.08206 L·atm/K·mol

T = temperature = 36 + 273.15 = 309.15 K

We need to solve for n, which is the number of moles of gas. To do this, we can rearrange the equation;

n = PV/RT

Substituting the given values, we get;

n = (688 mmHg) x (0.344 L) / (0.08206 L·atm/K·mol x 309.15 K)

n = 0.0115 mol

Now, we can use the molar mass of helium (4.003 g/mol) to convert the number of moles to grams;

mass = n x molar mass

mass = 0.0115 mol x 4.003 g/mol

mass = 0.046 g

Therefore,  0.046 grams of helium gas occupy 344 mL at 688 mmHg and 36 degrees Celsius.

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Which of the following statements best explains the trends in boiling points?

A. The atomic size increases down the group, and this decreases the strength of the intermolecular forces.

                                           A is incorrect

B. The total number of electrons decreases down the group, and this decreases the strength of the intermolecular forces.

                                            B is incorrect

C. The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.

                                             C is correct

D. The chances of forming a permanent dipole increases down the group, and this increases the strength of the intermolecular forces.

                                              D is incorrect

The boiling point increase down a group because the total number of electrons increases down the group, and this increases the strength of the intermolecular forces. Hence option C is correct.

Boiling point of a substance is the temperature at which the substance changes from its liquid state to vapour state. Boiling point of a molecule or compounds depends on the bond type, molecular weight, temperature and pressure.

For ionic compounds, boiling point will be higher since ionic bonds are stronger than covalent compounds. There is a periodic trend for the physical properties such as boiling point for elements in periodic table.

Down a group, the number of electrons increases and the atomic size also as well as the ionic character increases down a group . These two facts leads to higher intermolecular attraction, thus more temperature have to applied to weaken the bonds.

Higher temperature to be applied means the boiling point of the substance is higher. Therefore, boiling point down a group increases because of the higher intermolecular attraction as said in option C.

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1) Determine the mass of zirconium

Convert moles of zircon into moles of zirconium

Convert moles of zirconium into mass of zirconium (g)

2) Determine the mass of Silicon

Convert moles of zircon into moles of silicon

Convert moles of silicon into mass of silicon (g)

3) Determine the mass of Oxygen

Convert moles of zircon into moles of oxygen

Convert moles of oxygen into mass of oxygen

The mass of zirconium is 30.87 g

The mass of silicon is 9.504 g

The mass of oxygen is 21.66 g

Answer:

Explanation:

given mass=220 kg

acceleration=5 m/s2

F=ma

F=220*5

F=1100N

The force from the motorbike's engine, given the data is 1100 N

The force from the bike's engine can be obtained as illustrated below:

Force = mass × acceleration

Force = 220 × 5

Force = 1100 N

Thus, the force from the bike's engine is 1100 N

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Amphiprotic species are those that can act as both an acid and a base in a chemical reaction. So, among the given options

(a) H₂O - amphiprotic

(b) S₂⁻ - amphiprotic

(d) HSO₄⁻ - amphiprotic

(e) CO₃²⁻ - amphiprotic

(a) H₂O can act as an acid by donating a proton (H⁺) and as a base by accepting a proton. For example, in the reaction with HCl, water acts as a base and accepts a proton to form H₃O⁺ and Cl⁻. The chemical equation for the amphiprotic character of water can be written as:

H₂O + HCl -> H₃O⁺ + Cl⁻

(b) S₂⁻ can also act as an acid and donate a proton, or as a base and accept a proton. For example, in the reaction with HCl, sulfide ion acts as a base and accepts a proton to form HS⁻ and Cl⁻. The chemical equation for the amphiprotic character of S₂⁻ can be written as:

S₂⁻ + HCl -> HS⁻ + Cl⁻

(d) HSO₄⁻ and CO₃²⁻ are also amphiprotic species. HSO₄⁻ can act as an acid and donate a proton or as a base and accept a proton. For example, in the reaction with NH₃, HSO₄⁻ acts as an acid and donates a proton to form NH₄⁺ and SO₄²⁻. The chemical equation for the amphiprotic character of HSO₄⁻ can be written as:

HSO₄⁻ + NH₃ -> NH₄⁺ + SO₄²⁻

(e) CO₃²⁻ can act as an acid and donate two protons or as a base and accept two protons. For example, in the reaction with HCl, CO₃²⁻ acts as a base and accepts two protons to form H₂CO₃ and Cl⁻. The chemical equation for the amphiprotic character of CO32- can be written as:

CO₃²⁻ + 2HCl -> H₂CO₃ + 2Cl⁻

Therefore, only H₂O, S₂⁻, HSO₄⁻, and CO₃²⁻ are amphiprotic species. a, b, d and e are the correct options.

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The ring rolls slower than the disk when both objects are at rest and roll down a hill together. Option B is correct.

When a ring and a disk roll down a hill together, the ring will roll slower than the disk. This is because the distribution of mass in a ring is different from that of a disk. In a ring, the mass is concentrated towards the outer circumference, while in a disk, the mass is evenly distributed throughout.

As the objects roll down the hill, they convert potential energy into kinetic energy. The rotational kinetic energy of a rolling object depends on its moment of inertia, which is influenced by the mass distribution. Since the mass is concentrated towards the outer circumference of the ring, it has a larger moment of inertia compared to the disk. This higher moment of inertia results in a slower rotation and, therefore, a slower rolling speed for the ring compared to the disk.

Hence, B. is the correct option.

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--The given question is incomplete, the complete question is

"A ring and a disk both at rest roll down a hill together. Which rolls slower? A) disk B) ring C) both roll at the same speed D) not enough information to answer the question."--

Answer: 1.354 g/mL . The problem provides us with the mass of the empty flask (99.895 g) and the mass of the flask with the solution (126.975 g).

To determine the mass of the solution, we subtract the mass of the empty flask from the mass of the flask with the solution:

Mass of the solution = mass of flask with solution - mass of empty flask

= 126.975 g - 99.895 g

= 27.080 g

Next, we use the volume of the flask (20.0 ml) as the volume of the solution since the unknown substance was added to fill the flask to the mark and water was added to dissolve it to a total volume of 20.0 ml.

Finally, we calculate the density of the solution using the formula:

Density of the solution = mass of solution / volume of solution

Plugging in the values we found, we get:

Density of the solution = 27.080 g / 20.0 ml

= 1.354 g/mL

Therefore, the density of the solution is 1.354 g/mL.

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Answer:

C.

Explanation:

Answer:

b. the precision of the throws

Explanation:

When dealing with paper delivery homeowners are mainly concerned about the precision of the throws. They technically want the paper to land directly on their front door. Landing there, the paper will be protected from the rain and be visible for the homeowner to easily see it and pick it up in the morning when they wake up. Bad precision can lead the paper to fall into a puddle or on the grass where it will get wet and become useless or even end up breaking a window or other fragile items.

Answer:

a: cells

Explanation:

just did it. your welcome have a nice day

answer :- The smallest unit of life that conducts all life function are cell

Answer::::::::::::

D

When atoms and molecules speed up or slow down, that is a physical change. When they change state from liquid to solid or from gas to liquid, that is a physical change. ... The ions or molecules can still come back together to form the original substance

The physical change which happens to atoms and molecules in a solution that is strongly heated in a flame is;

Atoms and molecules which are units of matter when strongly heated in a flame have increased internal energy and would undergo a phase change to a more energetic state of matter which is the gaseous state.

As such, the physical change that occurs in them is. increased internal energy.

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The heat energy absorbed by the water in the experiment according to the calorimeter data is 10450 J

From the question give above, the following data were obtained:

From calorimetry, we understood that heat absorbed is given by the following formula

Q = MCΔT

Inputting the given parameters, we can obtain the heat absorbed by the water as follow:

Q = 100 × 4.18 × 25

Q = 10450 J

Thus, we can conclude that the heat energy absorbed by the water is 10450 J

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