If 23.5 g of magnesium occupies 13.5 cm^3 what is the density of magnesium

Answer:

Option 1

Explanation:

Here the formation of water is shown

\(\\ \tt\bull\rightarrowtail H_2+O_2\longrightarrow H_2O\)

Hydrogen and oxygen combine together to form water.

Refrigerant charged systems should be leak checked with pressure decay test.

Leak checking a system charged with R134a refrigerant is important to ensure that the system is operating properly and efficiently. Leak checking should be done at installation, following service or repair and after any significant vibration or disruption. The most common way of leak checking is to perform a pressure decay test.

This requires pressurizing the system with nitrogen and then measuring the pressure over time. If a leak is present, the pressure will decrease at a greater rate than a system without leaks. Another method is to use a halide leak detector, which uses a combination of a combustible gas and a halide gas that reacts with the refrigerant to produce a visible blue flame when a leak is present.

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Answer:

\(\large \boxed{\text{3.45 L}}\)

Explanation:

We will need a balanced chemical equation with molar masses, so, let's gather all the information in one place.

Mᵣ:       122.55

           2KClO₃ ⟶ 2KCl + 3O₂

m/g:       25.5

(a) Moles of KClO₃

\(\text{Moles of KClO}_{3} =\text{25.5 g KClO}_{3} \times \dfrac{\text{1 mol KClO}_{3}}{\text{122.55 g KClO}_{3}} = \text{0.2081 mol KClO}_{3}\)

(b) Moles of O₂

The molar ratio is 3 mol O₂:2 mol KClO₃

\(\text{Moles of O$_{2}$}= \text{0.2081 mol KClO}_{3} \times \dfrac{\text{3 mol O$_{2}$}}{ \text{2 mol KClO}_{3}} = \text{0.3121 mol O$_{2}$}\)

(c) Volume of O₂

We can use the Ideal Gas Law to calculate the volume of hydrogen.

pV = nRT

T = (25.44 + 273.15) K =  298.59 K

\(\rm V = \dfrac{nRT}{p}= \dfrac{\text{0.3121 mol $\times$ 0.0821 L$\cdot$atm$\cdot$K$^{-1}$mol$^{-1}\times$ 298.59 K}}{\text{ 2.22 atm}} = \textbf{3.45 L} \\\\\text{The volume of oxygen is $\large \boxed{\textbf{3.45 L}}$}\)

Answer:

Solution:-

The balanced equation:

2KClO3 (s)  \rightarrow 2KCl (s) + 3 O2 (g)

Molar mass of KClO3 = 122.55 g/mol

Number of moles of KClO3 = (Mass of KClO3 / Molar mass of KClO3) = (25.5 g / 122.55 g/mol) = 0.2081 mol

From balanced equation, 2 mol of KClO3 produce 3 mol of O2. Or, 1 mol of KClO3 produces (3/2) mol of O2.

therefore, 0.2081 mol of KClO3 will produce = (3/2) × (0.2081) = 0.3121 mol of O2

Now, we have number of moles (n) of O2 = 0.3121 mol

Pressure (P) = 2.22 atm

Temperature (T) = 25.44°C = (273.15 + 25.44) K = 298.59 K

R (Gas constant) = 0.0821 L.atm/mol.K

Volume (V) of O2 = ?

Using the ideal gas equation,

V = nRT / P

Substituting the values in the equation, we get :

V = (0.3121 mol × 0.0821 L.atm/mol.K × 298.59 K) / (2.22 atm) = 3.45 L

Hence, the volume of O2 gas produced = 3.45 L

Explanation:

b. The critical path refers to the longest sequence of activities from the start to the end of a project, considering the duration of each activity.

c. The total duration for the critical path activities is 18 days, which represents the expected project completion time.

The critical path is a term used in project management to refer to the sequence of activities that determines the minimum time required to complete a project. It is the longest path from the start to the end of the project, considering the duration of each activity. The critical path helps identify the activities that must be closely monitored and managed to ensure the project is completed on time.

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Answer:

14 mol O₂

Explanation:

The reaction between CO and O₂ is the following:

CO + O₂ → CO₂

We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:

2CO + O₂ → 2CO₂

As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:

28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂

The correct answer is d. Ru (Ruthenium). The electron configuration of Ru is \([Kr] 5s^2 4d^6\), but when it is in its ground state, one of the 4d electrons is promoted to the 5s orbital.

Ruthenium is a rare transition metal element that has the atomic number 44 and the symbol Ru. It is part of the platinum group of metals, which also includes elements like platinum, palladium, and rhodium. It has a silvery-white metallic appearance and is one of the densest elements, with a density of 12.4 g/cm³. It has a high melting point of 2,334°C and a boiling point of 4,696°C. It is a hard, brittle metal that is resistant to corrosion and oxidation. It is used in various industrial and technological applications, such as in the production of hard disk drives, electrical contacts, and jewelry.

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Answer:  There are 6.9 mol of \(F_{2}\) are required to react completely with 2.30 mol of S.

Explanation:

The given reaction equation is as follows.

\(S(s) + 3F_{2}(g) \rightarrow SF_{6}(g)\)

Here, 1 mole of S is reaction with 3 moles of \(F_{2}\) which means 1 mole of S requires 3 moles of \(F_{2}\).

Therefore, moles of \(F_{2}\) required to react completely with 2.30 moles S are calculated as follows.

\(1 mol S = 3 mol F_{2}\\2.30 mol S = 3 mol F_{2} \times 2.30 \\= 6.9 mol F_{2}\)

Thus, we can conclude that there are 6.9 mol of \(F_{2}\) are required to react completely with 2.30 mol of S.

The equation that describes the total amount of pure saline in the solution is: x + y = 45.

In the given scenario, x represents the amount of saline solution and y represents the amount of saline solution. The experiment calls for a total of 45 gallons of the saline solution. Since the total amount of saline in the solution is the sum of the amounts in each component, the equation x + y = 45 represents the total amount of pure saline in the solution.

The equation simply states that the combined amounts of saline solution (x) and saline solution (y) should add up to 45 gallons, fulfilling the requirement of the experiment. It provides a straightforward mathematical representation of the relationship between the two components in terms of their total quantity.

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A. If the bubble point pressure is less than the operating pressure of the flash unit (0.6 bar), the mixture will flash. B. The final composition and amount of the phases will depend on the initial vapor fraction and the operating pressure. C. We can repeat the calculation in part B to determine the composition and amount of the equilibrium liquid and vapor at the new conditions. D. If the vapor fraction is high, it may indicate that the feed is rich in the more volatile components, such as toluene.

A. To determine if the mixture will flash, we need to compare the bubble point pressure (the pressure at which the first bubble of vapor appears) with the operating pressure of the flash distillation unit. We can use a software tool or a phase equilibrium diagram to calculate the bubble point pressure for the given mixture. If the bubble point pressure is less than the operating pressure of the flash unit (0.6 bar), the mixture will flash.

B. If the mixture flashes, we can calculate the composition and amount of the equilibrium liquid and vapor using the material balance and the equilibrium relationship. We need to assume an initial vapor fraction, and then calculate the vapor and liquid flow rates, and check if the initial assumption is consistent with the equilibrium relationship.

We can repeat this process until we converge to a consistent solution. The final composition and amount of the phases will depend on the initial vapor fraction and the operating pressure.

C. To determine if the mixture will flash at 1.5 bar and 140°C, we need to repeat the same calculation as in part A, but using the liquid exiting the first flash unit as the feed. If the mixture flashes, we can repeat the calculation in part B to determine the composition and amount of the equilibrium liquid and vapor at the new conditions.

D. To calculate the percentage of the original benzene that is now a vapor, we need to add up the vapor flow rates of benzene in both flash units and divide by the total benzene flow rate in the feed. We can use the same approach to calculate the percentage of toluene that is now a vapor.

The percentage will depend on the operating conditions and the composition of the feed. If the vapor fraction is high, it may indicate that the feed is rich in the more volatile components, such as toluene.

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The empirical formula of the compound is K2O.

We need to determine the ratio of atoms in the compound. Here, we are given the masses of potassium and oxygen that are produced by decomposing the compound.

From the given information, we know that

Mass of K = 19.55 g

Mass of O = 4.00 g

We can use these masses to determine the number of moles of each element:

Moles of K = 19.55 g / 39.10 g/mol (molar mass of K) = 0.500 mol

Moles of O = 4.00 g / 16.00 g/mol (molar mass of O) = 0.250 mol

Next, we need to find the simplest whole number ratio of K to O. To do this, we divide each number of moles by the smaller number of moles (in this case, 0.250 mol):

Moles of K / Moles of O = 0.500 mol / 0.250 mol = 2.00

This means that the ratio of K to O in the compound is 2:1.

Therefore, the empirical formula of the compound is K2O.

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Answer:

4.4 × 10^-7

3 × 10^5

Explanation:

scmack me wit dat brainliest

Answer:

B is correct answer because The enthalpy is negative so this means the reaction produces heat and the reaction is exothermic

Find the number of moles in each reactant in the formula CO + 2 H2 CH3OH.

= 174371 g = 174.4 kg.

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Direct contact between objects causes conduction or heat transfer. The heat is transferred inside the fluid during convection. Heat transfer in radiation happens by electromagnetic waves without the use of particles.

First, ascertain whether the two things are in contact. If they are, conduction is how heat is transferred between them. Determine whether there is a fluid medium, such as a liquid or gas, connecting the items if they are not in contact.

Evidence of heat transport is apparent. Convection is the phenomenon that causes the air to shimmer over radiators. Conduction is the phenomenon that causes you to feel warm when you place your hand on a spoon that has been sitting in a hot bowl of soup (radiation).

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The internal pressure of the gas in PSI when its temperature reaches 946 Celsius would be 148.7 PSI.

Using the ideal gas law:

PV = nRT

where R is the universal gas constant.

At STP, the pressure is 1 atm and the temperature is 0°C (273 K).

n = PV/RT = (1 atm x 22.4 L) / (0.0821 L·atm/(mol·K) x 273 K) = 1 mol

This means that there is one mole of gas in the can.

To determine the pressure of the gas in the can at 946°C, we need to convert the temperature to kelvin:

T = 946°C + 273 = 1219 K

Now we can rearrange the ideal gas law to solve for the pressure:

P = nRT/V

We know that n = 1 mol, and we can assume that the volume of the can is constant. Therefore, we can write:

P = RT/V

We can use the value of R in units of PSI·ft^3/(lb·mol·K):

R = 10.73 PSI·ft^3/(lb·mol·K)

We also need to convert the temperature to units of Kelvin:

T = 1219 K

Substituting these values into the ideal gas law equation, we get:

P = (10.73 PSI·ft^3/(lb·mol·K)) x (1219 K) / (22.4 L x 0.0353 ft^3/L)

P = 148.7 PSI

Therefore, the internal pressure of the gas in the can is 148.7 PSI when its temperature reaches 946°C. It's important to note that aerosol cans should not be thrown into a fire, as they can explode and cause injury or damage.

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The balanced chemical equation for the reaction is 4Na + O₂ → 2Na₂O. This means that for every 4 moles of sodium (Na) and 1 mole of oxygen (O₂) that react, 2 moles of sodium oxide (Na₂O) are produced.

To determine the correct answer, we need to use stoichiometry to calculate the theoretical yield of Na₂O based on the amount of Na and O₂ present in each scenario. We can then compare the calculated yield to the given yield of 169 g and 527 g to see which starting material (Na or O₂) produces a lower yield.

A. To calculate the theoretical yield of Na₂O based on 5.43 moles of Na:

5.43 moles Na x (2 moles Na₂O / 4 moles Na) x (62 g Na₂O / 1 mole Na₂O) = 168.78 g Na₂O

The calculated yield of Na₂O based on 5.43 moles of Na is very close to the given yield of 169 g. Therefore, we can conclude that Na is not the correct answer.

B. To calculate the theoretical yield of Na₂O based on 4.25 moles of O₂:

4.25 moles O₂ x (2 moles Na₂O / 1 mole O₂) x (62 g Na₂O / 1 mole Na₂O) = 527.25 g Na₂O

The calculated yield of Na₂O based on 4.25 moles of O₂ is very close to the given yield of 527 g. Therefore, we can conclude that O₂ is not the correct answer.

C. Since Na is not the correct answer and O₂ is not the correct answer, the only option left is C. Therefore, the correct answer is O₂ because it has the lower starting mass.

To determine the amount of chlorine gas needed to make a certain amount of sodium chloride, we need to use stoichiometry and the balanced equation for the reaction.

According to the equation, 2 moles of sodium react with 1 mole of chlorine gas to produce 2 moles of sodium chloride. Therefore, for every mole of sodium chloride produced, we need half a mole of chlorine gas.

Since we want to make 0.6 moles of sodium chloride, we need half that amount, or 0.3 moles of chlorine gas. Thus, the correct answer is B) 0.3.

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Thick liquid layer that interacts with an inert carrier gas or mobile phase and is chemically linked to the inside of a capillary column

What is a chromatographic example?

Chromatography Methods

Some forms of liquid chromatography include high-performance liquid chromatography (HPLC), size exclusion chromatography, and supercritical fluid chromatography. Ion-exchange, resin, and paper chromatography are a few other varieties of chromatography.

What is the chromatography's fundamental tenet?

Chromatography is one more method for separating and analyzing chemical mixtures. The method is based on the interaction of polarity between the sample and two additional components, the solid (or stationary) phase, and the mobile phase, which can be either a liquid or a gas.

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Answer:

Explanation:

a substance's enthalpy of fusion tells you how much heat is needed in order to convert

1 g

of said substance from solid at its melting point to liquid at its melting point.

In water's case, an enthalpy of fusion equal to

333.55 J g

−

1

tells you that

1 g

of ice at

0

∘

C

can be converted to

1 g

of liquid water at

0

∘

C

by supplying

333.55 J

of heat.

Your ice cube has a mass of

55.0 g

, which means that it will require

55.0

g

⋅

=

Δ

H

fus



333.55 J

1

g

=

18,345.25 J

Rounded to three sig figs, the number of sig figs you have for the mass of the ice cube, the answer will be

heat needed

=

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

18,300 J

a

a

∣

∣

−−−−−−−−−−

Answer:Ocean breezes keep coastal Galveston cooler than Del Rio, which is inland and exposed to southerly winds.

Explanation: inwards has winds and outwards doesn’t have winds just the coast.

Answer:

I was traveling on a train where I fell asleep. someone stole my luggage in which I had money and other essentials. when the ticket checker arrived a lady paid my fine. she helped me a lot. when I told her about being robbed she helped me and took me to the police station and I found my bag. I insisted she take the money she paid for my fine but she said that in return you too help someone."I have never found such a kind person ever since.".....

Explanation: I think this is what you are looking for. Hope this helps.

Answer:

Intermolecular force for oil the dipole-dipole.

Intermolecular force for water hydrogen bonds.

Intermolecular force for vegetable oil nonpolar compound.

Intermolecular force for corn syrup fructose.  

The step in a chemical reaction that defines the pace (or rate) at which the entire reaction occurs is known as the rate-determining step.

Thus, The rate-determining step is comparable to the funnel's neck. The breadth of the funnel's neck, not the pace at which water is poured into it, limits or determines how quickly water flows down a funnel.

The sluggish step of a reaction controls the rate of a reaction, much like the funnel's neck.

Not all reactions have rate-determining stages, and those that do only have them if one of their steps is noticeably slower than the others.

Thus, The step in a chemical reaction that defines the pace (or rate) at which the entire reaction occurs is known as the rate-determining step.

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A system of linear equations to balance the following chemical reaction:

Limestone, CaCO₃, neutralizes the acid, H₃ O, in acid rain is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

To balance the chemical equation:

H₃O + CaCO₃ → H₂O + Ca + CO₂

We need to ensure that the number of atoms of each element is the same on both sides of the equation.

Let's assign variables to the coefficients of each compound:

H₃O: x

CaCO₃: y

H₂O: z

Ca: a

CO₂: b

Now, we can set up the system of equations based on the number of atoms for each element:

For hydrogen (H):

3x = 2z

For oxygen (O):

3x + 3y = 2z

For calcium (Ca):

y = a

For carbon (C):

y = b

For calcium (Ca):

a = 1

Solving this system of equations will give us the balanced coefficients. Let's solve it:

From the equation y = a, we have y = 1.

From the equation y = b, we have b = 1.

Substituting b = 1 into the equation 3x + 3y = 2z, we have:

3x + 3 = 2z

From the equation 3x = 2z, we have x = (2/3)z.

Substituting x = (2/3)z into the equation 3x = 2z, we have:

3(2/3)z = 2z

2z = 2z

This equation is true for any value of z, indicating that z can take any value.

Therefore, we can choose z = 3 to simplify the coefficients:

x = (2/3)z = (2/3)(3) = 2

y = 1

z = 3

a = 1

b = 1

Thus, the balanced equation is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

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If a chemical factory causes noxious fumes to be emitted in the neighborhood, a third party would be the people living in the surrounding neighborhood.

They are referred to as third-party victims, as they are not directly associated with the chemical plant and are suffering from the plant's harmful effects due to its location.In the given case, the chemical factory is causing noxious fumes to be emitted into the surrounding neighborhood, which is causing health hazards to the people living there. They can face breathing problems and even develop other health problems as a result of inhaling these noxious fumes. Since the people living there are not directly associated with the chemical plant, they are considered third-party victims.To be held responsible for the damages caused by these fumes, the plant owner should compensate the third-party victims by providing them with appropriate medical treatment and financial compensation. Besides, the chemical factory should install proper equipment to control these fumes from spreading into the surrounding environment. Therefore, the third-party victims have the right to sue the chemical factory to seek compensation for the damages they've incurred.

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Answer:

0.618 moles ZnCl2

Explanation:

Divide the 84.23 g by the total grams in one mole. You can find how many grams in 1 mole (molar mass) by adding the average atomic masses of the compound. For ZnCl2 65.39+35.45+35.45 = 136.29 g/mol. Then divide that by the grams you have.

According to the mole concept, there are 0.618 moles in 84.23 g of zinc chloride.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is calculated as mass/molar mass on substitution in formula, number of moles =84.23/136.28=0.618 moles.

Thus, there are 0.618 moles in 84.23 g  of zinc chloride.

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When a patient is admitted to the emergency department with symptoms of headache, weakness, and slight confusion, the physician diagnoses carbon monoxide poisoning. In this case, the nurse should first administer oxygen therapy to the client.

Carbon monoxide poisoning is a medical emergency that occurs when carbon monoxide (CO) gas is breathed in.

It may cause serious harm or death, making it important to identify and manage the condition as soon as possible.

CO is a colorless, odorless, tasteless gas that is produced by burning fuels like coal, wood, charcoal, oil, kerosene, natural gas, and propane.

Carbon monoxide poisoning is a medical emergency that can lead to death if not treated quickly.

Symptoms of carbon monoxide poisoning include:

Headache

Dizziness

Nausea and vomiting

Weakness

Fatigue

Chest pain

Shortness of breath

Confusion

Loss of consciousness

The treatment for carbon monoxide poisoning involves removing the person from the source of CO gas and providing oxygen therapy.

Administering 100% oxygen through a mask is the preferred method of treatment, as it helps to reduce the amount of carbon monoxide in the blood and tissues.

This helps to restore oxygen to the body's tissues and organs, and it also helps to prevent the formation of carbon monoxide in the bloodstream.

The nurse should first administer oxygen therapy to the client because it is the first and most important step in treating carbon monoxide poisoning.

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