how many milligrams of chloramine would you find in one cup (1.0) of drinking water if the concentration is 4.0 ppm?

The theoretical yield of iron (55.845 g/mol) when 10.0 g Fe₂O₃ (159.69 g/mol) reacts with excess carbon (12.01 g/mol) is 6.99 g.

the balance equation is given as :

Fe₂O₃   +  3C     ---->    2Fe   +   3CO

the mass of Fe₂O₃  = 10 g

molar mass of Fe₂O₃  = 159.69 g / mol

the number of moles of Fe₂O₃  = mass / molar mass

                                                    = 10 / 159.69

                                                    = 0.062 mol

1 mole of Fe₂O₃  produce 2 mole of Fe

0.062 mol of Fe₂O₃  = 2 × 0.062 = 0.125 mol of Fe

mole of Fe = 0.125 mol

molar mass of Fe = 55.8 g/mol

mass of Fe = 0.125 × 55.5

                  = 6.99 g

The theoretical yield = 6.99 g

Thus, The theoretical yield of iron (55.845 g/mol) when 10.0 g Fe₂O₃ (159.69 g/mol) reacts with excess carbon (12.01 g/mol) is 6.99 g.

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Answer:

C. a substance made of two oxygen atoms for each carbon atom

The carbon–carbon bonds in naphthalene are not of the equal length. The bonds C₁–C₂, C₃–C₄, C₅–C₆ and C₇–C₈ are about 1.36 Å in length, whereas the other carbon–carbon bonds are about 1.42 Å long.

Naphthalene is two benzene rings joined together. It has three resonance structures. The double bonds present in the benzene ring are delocalized by intramolecular electron transfer to achieve stability. This is called resonance and these structures can be called resonance structures.

The C-C bond length in naphthalene is not the same. This is because naphthalene has a fused ring structure in which two benzene rings are fused. Single and double bonds are alternating, so the lengths of single and double bonds are different.

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25 mL of 2.5 m HNO₃ contains enough nitric acid to dissolve an old copper penny with a mass of 3.94 g

Molarity is a measure of the concentration of a chemical species, especially a solute, in solution and is expressed as the amount of substance per unit volume of solution. The most commonly used unit of molarity in chemistry is moles per liter in SI units using the unit symbols mol/L or mol/dm³.

For the given case,

Molar mass HNO₃ = 63.0 g/mol

Number of moles = 3.94 / 63.0

= 0.0625 moles

Volume = moles / molarity

V = 0.0625 / 2.5

V = 0.025 x 1000

= 25 mL

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To create 50 grams of sodium sulfate, 28.16 grams of sodium hydroxide are needed.

The International System of Units (SI) defines the gram as a unit of mass that is one thousandth of a kilogram. Another concept connected to mass is the gram.

The amount of matter that makes up a substance or an object is truly measured by its mass. The kilogram (kg) is the fundamental SI unit for mass, but lesser quantities are typically measured in grams (g). You would use a balance or perhaps a scale to measure mass.

According to the answer to the previous question, 80 grams of sodium hydroxide and 142 grams of sulfuric acid react to form sodium sulfate. So the amount of sodium hydroxide needed to make 50 grams of sodium sulfate is as follows:

80 × 50 / 142  = 28.16 grams.

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35g

Noting the mass of scientific tools such as beakers can help us take the mass of liquids and other samples that cannot be measured on their own.

Mass of the Liquid

To find the mass of the liquid, we have to know the mass of the beaker. Then, we can subtract the mass of the beaker from the mass of the liquid and beaker combined. This will leave the mass of the liquid.

The liquid has a mass of 35g.

Significant Figures and Units

Whenever doing scientific calculations, it is important to include significant figures and units.

Significant figures show the accuracy of a measurement. When, subtracting numbers, round to the smallest number of decimal places. Neither measurement has decimal points, thus the answer also should not have a decimal point. Thus the answer is just 35.

Then, make sure you have units. Since the original measurements are in grams, the answer should also be in grams. So, the final answer is 35 grams.

The bleach was in excess compared to the dye in the reaction between bleach and dye.

In the textile business, bleach is used to bleach cotton and linen. It is also used to bleach wood pulp in the paper industry and to bleach laundry.

It is the primary component of a solution that contains between 3 and 6 percent sodium hypochlorite (NaOCl), along with trace amounts of sodium hydroxide, hydrogen peroxide, and calcium hypochlorite.

A form of base that works particularly well at eliminating stains and colors is chlorine bleach.

A plot of ln(Abs) vs. time shows a straight line, indicating that the order with regard to the dye is "first order." The sequence of the reaction with respect to the bleach can be determined by looking at the rate constants and bleach volume.

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Rsa and diffie-hellman are two protocols that tls is capable of using for key exchange.

TLS encrypts the TCP header and payload. The packet payload stays encrypted the entire way since encryption is done in the protocol on one end system and decryption in the protocol on the other end system.

Both IPv4 and IPv6 networks use IPsec to authenticate and encrypt data packets. A packet's IP header contains IPsec protocol headers, which specify how a packet's contents are handled, including how it is delivered across a network and routed.

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The number of O₂ molecules required for cellular respiration of two glucose molecules would be 12.

Cellular respiration is the process by which biofuels are oxidized in the presence of inorganic electron acceptors, such as oxygen, to produce large amounts of energy and facilitate the mass production of ATP.

During aerobic respiration, 1 molecule of glucose is oxidized to 6 molecules of carbon dioxide with the help of 6 molecules of oxygen. Six water molecules are also formed in the process. Together, all three stages of cellular respiration generate up to 38 molecules of ATP from just one molecule of glucose.

First, let's look at the balanced breathing equation:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

From this formula, there are 6 moles of O₂ for every mole of glucose molecule required for full reaction.

Therefore, two glucose molecules require 6 x 2 = 12 mol of O₂.

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The given question is incomplete and the complete question is

A sample of 0.0606 mol of iron(III) chloride FeCl₃ was dissolved in water to give 35.4 mL of solution. What is the molarity  of the solution?

The molarity of the solution is 0.0017 mol/L

The molarity or concentration can be described by using the moles of the solute per liter of known aqueous solution and which is the volume the molarity also is designated as molar concentration

Here given data is

Iron(III) chloride = 0.0606 mol

Water means volume = 35.4 mL

We have to find molarity of the solution = ?

Molarity = moles of solute/volume of solution

Molarity =  0.0606 mol / 35.4 mL

Molarity = 0.0017 mol/L

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The correct answer with the correct number of significant figures is 1.554 * 10²⁴; the correct option is B.

Significant figures refer to each of the digits of a number that are used to express the given number to the required degree of accuracy, beginning from the first non-zero digit.

Significant figures are used to express the accuracy of a given calculation.

Significant figures are also used in the approximation of numbers.

In determining the number of significant figures to be used for a calculation, the level of accuracy required as well as the highest number of significant figures used in the calculation are considered.

Considering the given calculation:

6.022 × 1023 × 2.58

The highest significant figures of number in the calculation is four significant figures.

Hence, the answer will have four significant figures.

6.022 × 10²³ × 2.58 = 1.554 * 10²⁴

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Answer: Conduction

Explanation: Conduction is the transfer of heat energy from one substance to another or within a substance. Have you ever left a metal spoon in a pot of soup being heated on a stove? After a short time, the handle of the spoon will become hot.

Answer: it is transferred by conduction.

Explanation:

I took the test

Bond breaking is exothermic if more energy is released when we break the bond.

We know that a bond is able to hold two or more atoms together. Thus when a bond must be supplied with energy if we want to break the bond. Given that a bond can only be broken when we apply energy to it, we also have to consider the energy difference between the breaking and the making of the bond.

If the energy that is released at the breaking of the bond is higher than the energy that is required to make the bond then the process of the breaking of the bond is exothermic.

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The latest estimate for the annual number of photos taken is 1.72 trillion.

People are taking more images all around the world, and Rise Above Research, a consulting organization that conducts market research for the digital imaging sector, predicts that the total number of photos taken worldwide will reach 1.5 trillion in 2022.

Around the world, 1.72 trillion images are taken annually, or 54,400 each second or 4.7 billion per day. Every year, around 2.3 trillion pictures will be taken by 2030. Photutorial research indicates that 1.2 trillion photos were shot globally in 2021. In 2022, the amount will rise to 1.72 trillion.

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The maximum probably identification of this element is Beryllium.

Bromine and chlorine belong to the equal organization and consequently have similar chemical houses. The element with atomic wide variety 35 is bromine.

Chlorine and bromine belong to the identical group and consequently have similar residences. extraordinary numbers of neutrons affect the mass variety.

The mass number determines physical houses the atomic range determines chemical houses. consequently, isotopes have similar chemical residences but different bodily homes.

The factors with the most comparable chemical homes are those in the same institution or row of the periodic desk. factors are ordered through atomic variety and become in vertical corporations with the same quantity of valence electrons, in order that they have comparable chemical residences.

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At the end of the citric acid cycle most of the energy originally present in at in glucose is now found in NADH , FADH₂ .

At the end of the citric acid cycle most of the energy stored in the glucose found in NADH , FADH₂ . for each glucose molecule 10 NADH and 2 molecules of FADH₂  those are taken for the electron transport chain. At the end of the citric acid cycle the carbon originally present in glucose at CO₂.

Thus, At the end of the citric acid cycle most of the energy originally present in at in glucose is now found in NADH , FADH₂.

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The efficiency of the ramp is 0.25 or 25% if the input work is 96 J and output work is 24 J

This is the output-to-input ratio, which is frequently multiplied by 100 to get a percentage.

Given values: Input work = 96 J, Output work = 24 J

To find: Efficiency of a ramp= ?

Formula used: percent efficiency = (output work/input work) × 100

The efficiency will range from 24 J to 96 J because both the output and the input in this scenario take the form of work.

Percent efficiency = [tex]\frac{24}{96} \times 100[/tex]

                              = 25%

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Acids give hydrogen ions (H+) to water when they are dissolved in it. The hydrogen atoms that make up hydrogen ions have just one proton left after losing an electron, giving them a positive electrical charge.

Acids and bases dissolve in water and inhibit water dissociation by increasing the concentration of either protons or hydroxide ions, one of the byproducts of water self-ionization.

In an aqueous solution, strong acids and bases are completely ionised. In an aqueous solution, weak acids and bases ionise to a lesser extent. The acidity or basicity of their aqueous solutions can be changed by the salts of weak acids or bases.

Water has the capacity to combine to function as both an acid and a base simultaneously.

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Exit polls are one of the ways the media is able to predict the winners and losers of an election.

Exit polls have historically and in the course of the world been used as a test towards, and hard indicator of, the diploma of election fraud. some examples of this include the 2004 Venezuelan keep in mind referendum and the 2004 Ukrainian presidential election.

A benchmark poll is usually the first ballot taken in a marketing campaign. it's miles often taken before a candidate publicizes their bid for office, but every now and then it happens at once following that assertion after they have had a few possibilities to raise the budget. Polls help citizens study facts approximately each of the applicants. Polls tell the electorate the troubles that applicants assist. Polls discover the pinnacle candidates and the media interview those applicants.

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Answer:

It's B

Explanation:

at ground state the atomic number or proton number is equal to the electron number

Normally

the trend for electronic configuration goes as

1s² - 2S² - 2P⁶ -3S² - 3P⁶ -4S² - 3D¹⁰ and so on

(with each number representing a particular energy level and we go from lower to higher energy level)

but for this case we have sulfur

so we go from

1s² - 2S² - 2P⁶ - 3S² - 3P⁴ (I think that was what was supposed to be there not just 2P)

you fill from the lowest energy level to the highest and stop filling when you run out of electrons

since we only had 16 electrons I stopped at 3P⁴

Stirring is only required to dissolve sucrose sugar in water.

What is solubility?

Solubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. The opposite characteristic, insolubility, refers to the solute's incapacity to create a solution. The solvent is often a solid or a liquid, whereas the solute may be a solid, liquid, or gas. Both could be solution-based compounds or pure chemicals. Except in extremely rare circumstances, gases are always miscible in all ratios, and the only way a solid or liquid may be "dissolved" in a gas is by first becoming gaseous.

Temperature, pressure, and the makeup of the solute and solvent (including their pH and the presence of additional dissolved materials) are the key determinants of solubility.

Hence, stirring is only required to dissolve sucrose sugar in water.

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They would all exhibit the same pressure. The same number of moles of each gas are put in various containers, thus the gas will take up the same amount of space.

We could see the gases at the same temperature now. Since their volumes are equal, they will all have the same pressure. Now, by performing the following straightforward math, we can better comprehend this:

For H2:

Number of mole (n) = 1 mole

Volume (V) = 22.4L

Temperature (T) = 298K

Gas constant (R) = 0.0821 atm.L/Kmol

Pressure =..?

PV = nRT

Divide both side V

P = nRT /V

P = 1 x 0.0821 x 298 / 22.4

P = 1 atm

Therefore, H2 has a pressure of 1 atm.

For N2:

Number of mole (n) = 1 mole

Volume (V) = 22.4L

Temperature (T) = 298K

Gas constant (R) = 0.0821 atm.L/Kmol

Pressure =..?

PV = nRT

Divide both side V

P = nRT /V

P = 1 x 0.0821 x 298 / 22.4

P = 1 atm

Therefore, N2 has a pressure of 1 atm

For O2:

Number of mole (n) = 1 mole

Volume (V) = 22.4L

Temperature (T) = 298K

Gas constant (R) = 0.0821 atm.L/Kmol

Pressure =..?

PV = nRT

Divide both side V

P = nRT /V

P = 1 x 0.0821 x 298 / 22.4

P = 1 atm

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The statement from which investigation is an example of repetition is investigation 4. Option D.

Instructions are available in written or recorded form. The purpose of the statement is to summarize the information provided by those involved and prevent it from altering the story of what was witnessed. A hypothesis is a possible answer to a question. It is based on their own observations, existing theories, and information gleaned from other sources.

Scientists use hypotheses to make predictions. This is a testable statement that describes what the outcome of the investigation will be. A theory is a well-documented explanation of an observation. A scientific law is a statement that summarizes the relationships between variables. Experiments are controlled methods of testing hypotheses. A research study is a comprehensive set of techniques used to uncover secrets hidden.

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Assuming that you wanted to find out how long Nina's has been doing her watering activities, you should just simply divide the total amount of barrel with its daily usage. 75/5 = 15 weeks.

Her rain barrel held 75 L of water when she began watering. This indicates that there were 75 L left when she started at 0 weeks.

The first coordinate will therefore be; (0, 75). the y-axis is 75 and the x-axis is 0.

We are informed that she utilised 5 L of water from her barrel each week. Since 5 litres were consumed each week until the barrel was empty, the time it took for the barrel to be empty was 75/5, or 15 weeks.

This indicates that after the water is finished, the y-axis will be 0 L and the x-axis will be 15 weeks (0, 15).

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Water weighs is 12.371 g.

Mevoporation dish weighs 1.135 g.

Mevoporating dish plus a sample of MHydrate equals 25.637g

Mfirst heated sample plus Mevoporating dish = 16.428g

Mevoporation dish plus a second hot sample equals 13.266g

Serving of mevoporating = 1.135g

Mhydrated sample + Mevoporating dish = 25.637g

Mevoporating dish g = 25.637-1.135g=24.502g where Mhydrate sample is equal to 25.637g.

Serving of mevoporating = 1.135g

Second heated sample from a mevoporating dish weighs 13,266g

Msalt anhydrous = Msecond heated sample = 13.266-Mevoporating dish g = 13.266-1.135g = 12.131g

Msalt anhydrous = 24.502-12.131g=12.371g where Mwater = Mhydrate sample

12.371 g for Mwater

The sample and the dish have a combined mass of 13.266 g following a second heating session. After the second time, the pupil ends the heat/cool/weigh cycle.

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The noble gas neon is used for filling neon signs. Like other noble elements, it has a full octet that is complete outer energy level of electrons, which makes the gas unlikely to combine with the other elements.

The Neon is the noble gas.  according to the octet rule the element should contains the 8 valence electrons in the outer most shell to fulfill the octet rule and acquire the stability. the atomic number of the neon is 10 the electronic configuration is given as :

Neon atomic number 10 : [He] 2s² 2p⁶

so, the outermost electrons in the valence shell is 8 . so the noble gas itself very stable . neon does not react with any other elements to gain the stability.

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When a 25.0-ml sample of HCl is titrated with 0.350 m KOH. 34.6 ml of the base are required to reach the equivalence point. The concentration of HCl is 0.4844 M

The concentration of a substance is the amount of solute contained in a given volume of solution. Concentration is usually expressed in terms of molarity, expressed as the number of moles of solute in 1 L of solution. Solution concentration is the degree to which a solute is dissolved in a given amount of solvent or solution. An enriched response is a response that contains a very large amount of solute.

Concentration of HCl can be calculate as follows:

Titration is the process of determining the amount of substance A by adding measured increments of substance B, the titrant with which it reacts, until exact chemical equivalence is reached (equivalence point).

The formula (Macid x V acid =Mbase x Vbase ) represents the titration formula in chemistry.

M acid x V acid =Mbase x Vbase

Macid  =Mbase x Vbase

                  V acid

Macid  = 0.350 M x 34.6mL

                  25mL

M HCl = 0.4844 M

Therefore, when a 25.0-ml sample of HCl is titrated with 0.350 m KOH. 34.6 ml of the base are required to reach the equivalence point. The concentration of HCl is 0.4844 M

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15.13g is the mass of sodium formate, nahco2, must be dissolved in 250.0 ml of 0.100 m formic acid (hco2h) to yield a buffer solution of ph. 3.88

The sodium salt of formic acid, HCOOH, is sodium formate, HCOONa. It typically appears as a fine, white powder. Since formic acid can be produced cheaply and in large quantities by carbonylating methanol and hydrolyzing the ensuing methyl formate, sodium formate is often made by neutralizing formic acid with sodium hydroxide. In the final phase of the production of pentaerythritol and in the crossing Cannizzaro reaction of formaldehyde with the aldol reaction result trimethylol acetaldehyde [3-hydroxy-2,2-bis(hydroxymethyl)propenal], sodium formate is also inevitably produced as a by-product.

pH = pKa + log [base/acid]

3.88 = 3.752 + log (x / 1)  {1 comes from the 1.00 M formic acid}

log x = 0.128

x = -0.89 M (molarity)

MV = g/molar mass

(0.89 mol/L) (0.250 L) = x / 68.0069 g/mol

x =  15.13 g

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Answer:

The final state of the hydrogen atom is ground state after the emission of the photons.

The given parameters;

wavelength of the photon absorbed, λ₁ = 92.05 nm = 92.05 x 10⁻⁹ m

wavelength of the photon emitted, λ₂ = 1736 nm = 1736 x 10⁻⁹ m

The change in the energy of the photon is calculated as follows;

ΔE = hf₂ - hf₁

The new energy level is calculated as follows using Borh's model;

Thus, the final state of the hydrogen atom is ground state after the emission of the photons.

Explanation:

Any substance that is resistant to breakdown by common chemical reactions.

Elements                   No. of atoms

[tex]$2 \mathrm{CH}_4$[/tex]                          2- Carbon and 8-Hydrogen                            

[tex]$10 \mathrm{Mg}(\mathrm{OH})_2$[/tex]                 10-Magnesium, 20-Oxygen and 20-Hydrogen

[tex]$5 \mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$[/tex]                 10- Aluminum, 15- Sulfur and 60- Oxygen

[tex]$3 \mathrm{H}_2 \mathrm{O}$[/tex]                           6- Hydrogen and 3- Oxygen

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