How many grams are represented by 4.20 moles of aluminum oxide?
Report your answer to proper number of significant figures and units.

Answer:

4.0561×0.03÷63.5= 0.001916 mol cu

A coin is 3.00% Cu by mass. If the mass of the coin is 4.0561g, moles of Cu does it contain 0.001916 mole of Cu.

It is the most fundamental characteristic of matter and one of the fundamental quantities in physics.

Mass is a term used to describe how much matter is there in a body. The kilogramme is the SI unit of mass (kg). A body's mass does not alter at any point in time.

Given mass of coin = 4.0561g , moles =? , Cu by mass= 3.00%

4.0561×0.03÷63.5= 0.001916 mole Cu.

Thus, A coin is 3.00% Cu by mass. If the mass of the coin is 4.0561g, moles of Cu does it contain 0.001916 mole of Cu.

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Answer:

d.Elements have unique sets of properties

The temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

To determine the temperature of the gas in Kelvin after its volume is reduced, we can use the combined gas law, which relates the initial and final conditions of pressure, volume, and temperature for a given amount of gas.

The combined gas law equation is:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Where P₁ and P₂ are the initial and final pressures, V₁ and V₂ are the initial and final volumes, T₁ is the initial temperature in Kelvin, and T₂ is the final temperature in Kelvin.

Given that the initial volume V₁ is 3,480 mL, the initial temperature T₁ is -70.0 °C (which needs to be converted to Kelvin), and the final volume V₂ is 2,450 mL, we can substitute these values into the equation.

To convert -70.0 °C to Kelvin, we add 273.15 to it, resulting in T₁ = 203.15 K.

Now we can solve for T₂:

(T₂ * V₁) / T₁ = V₂

T₂ = (V₂ * T₁) / V₁ = (2,450 mL * 203.15 K) / 3,480 mL

Simplifying the equation, we find:

T₂ ≈ 143.27 K

Therefore, the temperature of the gas in Kelvin, after its volume is reduced to 2,450 mL, is approximately 143.27 K.

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Answer:Electrical

Explanation:because its above the earth's surface

Answer:

Chemical O

Explanation:

Answer

ΔHºrxn= 16.2 kJ

Procedure

The first step is to balance the equation. However, it is already balanced.

CH₃COOH → CH₄ + CO₂

For a chemical reaction, the enthalpy of reaction (ΔHrxn) is the difference in enthalpy between products and reactants

We will use the standard enthalpy of formation to calculate the standard enthalpy of reaction:

where

vp= stoichiometric coefficient of the product from the balanced reaction

vr= stoichiometric coefficient of the reactants from the balanced reaction

ΔHºf= standard enthalpy of formation for the reactants or the product

For this problem we will have the following:

Solving we have

ΔHºrxn= 16.2 kJ

Answer:

2 Reactants

Explanation:

its the iron and oxygen

Taking into account definition of reaction stoichiometry, 1.6442 grams of Fe₂O₃ can be produced if 1.15 g of iron is heated and placed in a bottle containing 0.0219 mol of oxygen gas.

In first place, the balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety and the chemical reaction will stop, determining the amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 3 moles of O₂ reacts with 223.4 grams of Fe, 0.0219 moles of O₂ reacts with how much mass of Fe?

mass of Fe= (0.0219 moles of O₂×223.4 grams of Fe)÷ 3 moles of O₂

mass of Fe= 1.63 grams

But 1.63 grams of Fe are not available, 1.15 grams are available. Since you have less mass than you need to react with 0.0219 moles of O₂, Fe will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 223.4 grams of Fe form 319.4 grams of Fe₂O₃, 1.15 grams of Fe form how much mass of Fe₂O₃?

mass of Fe₂O₃= (1.15 grams of Fe× 319.4 grams of Fe₂O₃)÷ 223.4 grams of Fe

mass of Fe₂O₃= 1.6442 grams

Then, 1.6442 grams of Fe₂O₃ can be produced if 1.15 g of iron is heated and placed in a bottle containing 0.0219 mol of oxygen gas.

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The number that is the same as the exponentiation given as follows: 2.5 × 10-³ is 0.0025.

Exponentiation is the process of calculating a power by multiplying together a number of equal factors, where the exponent specifies the number of factors to multiply.

For example, if 10 is multiplied three times, then it can be written as "10 raised to 3" which means 10³. In this case, 10 is the base, and 3 is the exponent.

Therefore, a number 0.0025 can be written in exponentiation as 2.5 × 10-³ by counting the number of zeros forward.

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Answer: d)endothermic with a positive entropy change

Explanation:

Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.

 Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

As temperature of water decreases on dissolution of \(NH_4NO_3\) , it means heat has been absorbed by \(NH_4NO_3\) during dissolution and that heat is taken from water. Thus process is endothermic. As dissolution will lead in the formation of ions \(NH_4^+\) and \(NO_3^-\) , randomness will increase and thus there is a positive entropy change.

Answer:

The first and second one for sure

Explanation:

Answer:Im not sure ABT THIS ONE

Explanation:

Answer:

Cartilage

Explanation:

Be careful, if you grind down your cartilage it pinches your nerves and can cause serious problems

Answer:

In a lab, a student mixes 25.0 ml of 0.115 M aluminum sulfate with 34.0 ml of 0.0975 M Lead (III) nitrate. Calculate the grams of the precipitate that is formed.

Explanation:

Answer:

4.82 g

Explanation:

To solve this problem we'll use the definition of molarity:

We are given the volume and concentration (keep in mind that 100mL=0.100L):

Now we calculate the number of NaCl moles required:

Then we convert 0.0825 NaCl moles into grams, using its molar mass:

gas has little particles that float around but very slowly and split up all around the place

Ethyne gas undergo combustion reaction to give two moles of carbon dioxide and water as per the balanced equation written below:

\(\rm C_{2} H_{2} + \frac{5}{2} O_{2} \rightarrow 2CO_{2} + H_{2}O\)

Combustion is a type of reaction in which a gas burns in oxygen to give water and carbon dioxide. Hydrocarbons alkanes, alkenes or alkynes easily undergo combustion reaction and they can be used as fuels.

C₂H₂ is an alkyne names ethyne and it is an unsaturated hydrocarbon with triple bond between two carbon atoms. Ethyne gas reacts with oxygen to give two moles of carbon dioxide and one mole of water.

To balance the number of carbons the right side carbon dioxide is multiplied by 2 and the number of oxygens is balanced accordingly to get the balanced equation as follows:

\(\rm C_{2} H_{2} + \frac{5}{2} O_{2} \rightarrow 2CO_{2} + H_{2}O\)

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Answer:

c. one must have a higher kinetic energy than the other system

To ensure insurance coverage for Percocet, it is essential to verify the patient's insurance coverage and check if prior authorization is required. If prior authorization is necessary, gather the required information, complete the authorization form, and submit it to the insurance company.

When a patient presents a prescription for a medication like Percocet, which requires prior authorization from the insurance company, several steps should be taken:

Verify Insurance Coverage: Check the patient's insurance coverage and confirm if prior authorization is required for Percocet. This can be done by contacting the insurance company or using an online portal provided by the insurer.

Review Prior Authorization Criteria: Understand the specific requirements set by the insurance company for obtaining prior authorization for Percocet. This may include documentation, medical history, and supporting evidence to justify the need for the medication.

Gather Patient Information: Collect relevant patient information, including medical records, diagnosis, and any previous treatments. This information will be used to support the prior authorization request.

Complete Prior Authorization Form: Fill out the necessary prior authorization form provided by the insurance company. Ensure that all required information is accurately entered, including the patient's details, prescriber information, and supporting documentation.

Submit the Request: Send the completed prior authorization form along with any supporting documents to the insurance company. This can be done electronically through their designated channels or by fax/mail, following their specified process.

Follow Up: Monitor the progress of the prior authorization request. Follow up with the insurance company to confirm receipt, inquire about any additional information needed, and track the status of the request.

Inform the Patient: Keep the patient informed about the prior authorization process, estimated timelines, and any potential out-of-pocket costs they may incur.

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The change in freezing point is 1.02°C

The change in the freezing point (ΔTf) is calculated from the following equation:

ΔTf = i x Kf x m

Given:

i = 1 (Van't Hoff factor, is equal to 1 because the solute is a nonelectrolyte)

Kf = 1.86°C/m (Freezing point constant of the solvent)

m = molality

We have to calculate the molality (m), which is equal to the moles of solute in 1 kg of solvent:

m = moles solute/ kg solvent

The solute is C₆H₁₂O₆. Thus, we calculate the moles of solute by dividing the mass into its molecular weight (Mw):

Mw(C₆H₁₂O) = (12 g/mol C x 6) + ( 1 g/mol H x 12) + (16 g/mol O x 6) = 180 g/mol

moles solute = mass C₆H₁₂O/Mw(C₆H₁₂O) = 14.7 g/(180 g/mol) = 0.082 mol

The solvent is water. Its mass (in kg) is obtained from the volume and the density, as follows:

kg solvent = V x density = 150 mL x 1.00 g/mL x 1 kg/1000 g = 0.15 kg

Now, we calculate the molality (m):

m = moles of solute/kg solvent = 0.082 mol/(0.15 kg) = 0.546 m

Finally, we calculate the change in freezing point:

ΔTf = i x Kf x m = 1 x 1.86°C/m x 0.546 m = 1.02°C

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Chlorine is more reactive than bromine because it replaces both bromine and iodine.

Fluorine is the most sensitive while on the other hand, the astatine is the least reactive as compared to other elements. The chlorine displaces both bromine and iodine, and bromine displaces iodine because of its high reactivity. The element that replaces other atom is considered as more reactive.

The order of reactivity is that the chlorine is more reactive than bromine, which indicates that chlorine is more reactive than iodine.

So we can conclude that chlorine is more reactive than bromine due to high reactivity.

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Okay I need an explanation from YOU. when is this due? If it’s last minute, why didn’t you do it when you had time? This is very irresponsible, unless you have a personal reason. Please quit commenting on others just for the points. I helped you with one, because I thought it was just one question you needed help with. No one is going to finish this for you. I’m sorry but it’s the truth, everyone here needs help. No one is here TO help. So please be cooperative and try to learn. Of course, I’m sorry if it is for a very personal reason as it happens to everyone where you need the work ASAP because of a reason. Hopefully, it’s not because you were lazy. Appreciate your education as not many people in the world have it.

B. It will be slow because you will have to wait for natural processes to affect each area.

What is Ocean?

An ocean is a vast body of saltwater that covers more than 70% of the Earth's surface. Oceans are the largest bodies of water on our planet and are essential for supporting life on Earth. Oceans play a crucial role in regulating the Earth's climate, absorbing heat and carbon dioxide, and generating oxygen.

The impact of human activities on ocean shores zones, such as coastal development, pollution, and overfishing, can have long-lasting and sometimes irreversible effects on these ecosystems. Restoring or mitigating the impacts of human activities on ocean shores zones requires time and effort, as natural processes need to take place to restore the affected areas.

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Answer:

Liquid–liquid extraction

Explanation:

The percentage by mass of hydrogen can be calculated from the problem as 2.016

To calculate the mass percent of an atom in a compound, you first need to determine the molar mass of the compound and the molar mass of the atom of interest.

Determine the molar mass of the compound by adding up the atomic masses of all the atoms in the compound.

Determine the number of moles of the atom of interest in one mole of the compound. This is done by dividing the atomic mass of the atom by the molar mass of the compound.

We know that the relative molecular mas of the compound is; 300 g/mol

Then;

Percent by mass of hydrogen is; 6/300 * 100/1

= 2.016%

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The "Wakanda speech," six weeks have passed, and the world is still in shock.

Thus, Global leaders and analysts were taken aback by King T'Challa's declaration at the United Nations General Assembly that the Kingdom of Wakanda is not a developing country of textiles, farms, and shepherds with a GDP per person of roughly $760 but rather a technological superpower and Wakanda speech.

The country's widespread employment of cutting-edge magnetic levitation trains, flying machines, opaque holograms, and spinal cord-healing beads has led to the coining of the phrase "uber-developed" nation.

The most watched video ever is currently "Welcome to the Future," an introduction video created by Wakanda's recently established Ministry of Foreign Affairs.

Thus, The "Wakanda speech," six weeks have passed, and the world is still in shock.

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Answer:

you can see the empirical formula at the pic

The empirical formula for compound (a) is NiI2, (b) is BaBr2 and (c) is BeS.

Empirical formula of a compound is defined as the simplest whole number ratio of atoms present in a compound.

(a) 1.245 g Ni : 5.381 g I

Mole of Ni ; Mole of I = 1.245/59 : 5.381/127 = 0.02 : 0.04 = 1:2

So the formula is NiI2

(b) 2.677 g Ba : 3.115 g Br

Mole of Ba : Mole of Br = 2.677/137 : 3.115/60 = 0.019 : 0.038

= 0.02 : 0.04 = 1:2

So the formula is BaBr2

(c) 2.128 g Be : 7.557 g S

Mole of Be : Mole of S = 2.128/9 : 7.557/32 = 0.2 : 0.2 = 1:1

So the formula is BeS

Thus, empirical formula for compound (a) is NiI2, (b) is BaBr2 and (c) is BeS.

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We need a color key to determine the pH of a solution using pH indicator paper.

pH is the measure of the hydrogen ions concentration in a solution which means the measure of acidity or alkalinity of the solution.

Generally, the pH scale ranges from 0 to 14.

A solution having a pH less than 7 is said to be acidic whereas a solution having a pH more than 7 is considered basic or alkaline

A solution having a pH equal to 7 is said to be neutral

pH indicators are weak acids that are found as natural dyes and that change color to show how many H⁺ (H3O⁺) ions are present in a solution.

The substance you are analyzing has an acidic, basic, or neutral pH value, which is calculated from the negative logarithm of H⁺ concentration.

The paper form of pH indicators is typically dipped into solutions and then removed for comparison against a color/pH key. Usually, the liquid form of pH indicators is added directly to solutions.

Thus, a color key or pH key is needed to determine the pH of a solution using pH indicator paper.

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Answer:

color key

creating a color key

have known PH values

A

Explanation:

hope this helps its all the answers in one