How many moles are in 15.0 g Aluminum

Photoelectric effect is the ejection of electrons from the metal surfaces, when light hos on it. The ejection of electrons makes the surface metal atoms to produce ions. Hence, D is correct.

The phenomenon of ejection of electrons from the surface of a metal when light of a suitable frequency falls on it is called photoelectric effect. Upon striking the surface of metals , light can set up an electric current which current which corresponds to the flow of electrons. This phenomenon is discovered by Einstein

For instance, visible light can cause ejection of electrons from the surface of metal like cesium which has low ionization enthalpy. This phenomenon is related to the observation that if light is considered as particles.

The particles of light is then called as photoelectrons or photons. Photoelectric effect thus, produce the metal ions by ejecting electrons from the atom.

Find more on photoelectric effect:

brainly.com/question/26465043

#SPJ9

A): The closest orbital to the nucleus, called the 1s orbital, can hold up to two electrons. This orbital is equivalent to the innermost electron shell of the Bohr model of the atom. It is called the 1s orbital because it is spherical around the nucleus. The 1s orbital is always filled before any other orbital.

From the question, the equilibrium constant in each case is;

\(1)  2.2 * 10^6\\2)2 * 10^-13\\3) 4.5 * 10^-7\)

The equilibrium constant is a dimensionless value and is independent of the initial concentrations of the reactants and products. It represents the ratio of the forward reaction rate to the reverse reaction rate at equilibrium.

We know that we can be able to obtain the equilibrium constant of the reaction in question by manipulating the equilibrium constant of the given equation.

In the first case;

\(K = (5 * 10^12)^1/2\\= 2.2 * 10^6\)

Second case;

\(K = (5 * 10^12)^-1\\K = 2 * 10^-13\)

Third case;

\(K = (5 * 10^12)^-1/2\\K = 4.5 * 10^-7\)

Learn more about equilibrium constant:https://brainly.com/question/28559466

#SPJ4

Answer:

The formula shows that there is one atoms of iron in each formula unit of FeCl3, and by definition the number of molecules or formula units in a mole is Avogadro's Number. Therefore, 5.33 moles contains 5.33 X Avogadro's Number of atoms, which is 3.21 X 1024 atoms, to the justified number of significant digits.

Answer:

The formula shows that there is one atoms of iron in each formula unit of FeCl3 , and by definition the number of molecules or formula units in a mole is Avogadro's Number . Therefore , 5.33 moles contains 5.33 X Avogadro's Number of atoms , which is 3.21 X 1024 atoms , to the justified number of significant digits .

To prepare 10.0 ml of a 0.25% m/v HCl solution, you will need to mix 2.5 ml of 1% m/v HCl solution with 7.5 ml of distilled water.

To make 10.0 ml of a 0.25% m/v HCl solution from 1% m/v HCl, dilute the 1% m/v HCl solution by a factor of 4.

Here's how to figure out how much 1% m/v HCl and distilled water you'll need:

Determine the concentration of HCl in the final solution:

A 0.25% m/v HCl solution contains 0.25 grams of HCl per 100 mL. 

As a result, there will be 0.25 g/100 ml x 10 ml = 0.025 g of HCl in 10 ml of solution.

Determine the quantity of 1% m/v HCl required:

1% m/v HCl implies that there is one gram of HCl in every 100 ml of solution. You will need the following to make 0.025 g of HCl:

0.025 g/1 g x 100 ml = 2.5 ml of 1% m/v HCl solution

Determine the amount of distilled water required:

To prepare the remaining 7.5 ml of solution, use the following :

10 ml - 2.5 ml = 7.5 ml of distilled water

For more such questions on solution, click on:

https://brainly.com/question/23269908

#SPJ4

Answer:

\( \frac{13}{6} \: c\)

Explanation:

The total isotopic mass is 13 (7 neutrons, 6 protons because this is Carbon)

Answer:

To calculate the specific heat of the rock, you can use the formula for heat transfer: Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity and ΔT is the change in temperature.

In this case, we can assume that the heat lost by the rock is equal to the heat gained by the water. Therefore:

Q(rock) = Q(water)

m(rock)c(rock)(T(final) - T(initial, rock)) = m(water)c(water)(T(final) - T(initial, water))

where m(rock) = 6.7 g, T(initial, rock) = 100.0°C, T(final) = 45°C, m(water) = 100.0 g (assuming the density of water is 1 g/mL), c(water) = 4.18 J/g°C (specific heat capacity of water), and T(initial, water) = 23°C.

Substituting these values into the equation above and solving for c(rock), we get:

c(rock) = (m(water)c(water)(T(final) - T(initial, water))) / (m(rock)(T(final) - T(initial, rock)))

c(rock) = (100.0 g * 4.18 J/g°C * (45°C - 23°C)) / (6.7 g * (45°C - 100.0°C))

c(rock) ≈ 1.26 J/g°C

So the specific heat of the rock is approximately 1.26 J/g°C.

Answer:

b. Stir the water

Explanation:

Answer:

c,b not sure,c,v,b hope it will help u

The amount of table salt in one serving or 155g of chips is 0.608g if the sample of chips used to make the filtrate weighed 75.5 kg.

By undergoing titration by Mohr's method with AgNO₃ and KCl, The chemical reaction is given by,

AgNO3(aq) + NaCl(aq) --> AgCl(s) + NaNO3(aq)

No moles of KCI are given by W/G.M.Wt

= 0.5/74.55

= 0.006707 moles of KCI

Then, from the reaction,

no of moles of KCI = no of moles of AgNO₃

Therefore,

molarity of AgNO₃ = no of moles/volume in L

= 0.006707/0.0625

= 0.107312M

47.2 ml of AgNO₃ solution to precipitate all of the chlorides.

Then, no of moles of Cl⁻ = molarity x volume in L

On substituting,

= 0.107312*0.0472

= 0.005065 moles

no of moles of Cl⁻ = no of moles of NaCl

mass of NaCl = no of moles of NaCl x gram molar mass of NaCl

 = 0.005065 x 58.5

 = 0.2963g of NaCl

155/75.5. = 2.05298013 chips

2.05298013x 0.2963 = 0.608298013 g

Therefore, 0.608g of NaCl is in 115g of chips.

To know more about food chemistry, click below:

https://brainly.com/question/29517724

#SPJ4

(1) The element with an electron configuration of    1s22s22p63s23p64s23d6 is Iron (Fe).

The above electronic configuration is the repesentation of the electrons presents in different orbitals of the iron(Fe) .we have seen that all orbitals is completely filled before D orbital.

(2) The element with an electron configuration of 1s22s22p63s23p6 is Argon (Ar)

The above electronic configuration is the repesentation of the electrons presents in different orbitals of the Argon(Ar) .we have seen that all orbitals  is completely filled.

(3) The name of the element with a valence electron configuration of 4s1 is Potassium (K)

The above electronic configuration is the repesentation of the electrons presents in different orbitals of thePotassium (K) .we have seen that all orbitals  is completely filled before  4s1.

(4) The name of the element with a valence electron configuration of 2s22p5 is Flourine (F)

The above electronic configuration is the repesentation of the electrons presents in different orbitals of the Flourine (F) .we have seen that all orbitals  is completely filled before  2p5.

A. An element with the valence electron configuration 3s1 would form a monatomic ion with a charge of +1. In order to form this ion, the element will lose one electron from the 3s subshell.

B. An element with the valence electron configuration 3s23p3 would form a triatomic ion with a charge of -3. In order to form this ion, the element will gain three electrons from the 3s and 3p subshells.

Elements achieve an inert gas configuration by gaining or losing electrons to attain a full valence shell of electrons, resulting in a stable electron configuration. This is also known as having a complete octet in their outermost energy level.

To know more about  valence electron click below:

https://brainly.com/question/28977387#

#SPJ4

One of the benefits of utilizing an automated chest compression device is that it provides consistent and effective compressions, which can lead to better outcomes for patients in cardiac arrest. These devices are designed to deliver compressions at a consistent rate and depth, which is difficult to achieve consistently with manual compressions.

Manual chest compressions are physically demanding and can result in fatigue, which can impact the quality of compressions over time.

Automated devices, on the other hand, are designed to provide consistent compressions for extended periods without fatigue, which can improve outcomes for patients in cardiac arrest.
Another benefit of automated chest compression devices is that they can free up medical personnel to perform other tasks during a cardiac arrest.

When performing manual compressions, medical personnel must stay in close proximity to the patient and continue to provide compressions for extended periods.

With an automated device, medical personnel can step back and focus on other tasks, such as administering medications or managing the airway, while the device provides consistent compressions.
In addition, automated devices can be used in a variety of settings, including hospitals, ambulances, and other pre-hospital settings.

This allows for consistent care across different locations and can help improve outcomes for patients who experience cardiac arrest.
Overall, the use of automated chest compression devices can provide significant benefits for patients in cardiac arrest, including more consistent and effective compressions, increased efficiency, and improved outcomes.

For more such questions on cardiac arrest

https://brainly.com/question/30215118

#SPJ8

The best type of planning hull for handling rough water is a deep-V hull. A deep-V hull that has a sharp, angled V-shape at the bottom and is designed to cut through the water.

This design allows the hull to ride up over waves and maintain stability and control in choppy seas. The deep-V also helps to reduce spray, making it more comfortable for passengers. Additionally, the deep-V hull has greater speed and maneuverability than other types of planing hulls, allowing it to maneuver effectively in rough water. The deep-vee hull also helps the boat to cut through waves and maintain its course, while the sharp bow and stern reduce drag and increase the boat’s speed.

To learn more about water click here https://brainly.com/question/28465561

#SPJ4

Lauric acid, 300 g

Benzoic acid, 30 g

Paper towels

Advance Preparation

It is important that you do the laboratory yourself beforehand. Time may be saved by pre-filling the test-tubes with about 25 g of lauric acid and having the hot and warm water baths ready. [NOTE: The mass of the lauric acid in the test-tubes must be determined to the nearest gram.]

Answer:

intruducing nuclear in a country like nepal where the knowledge of nuclear science is limited is a major task.

Explanation:

(maybe it will help if not sorry because my answer is wrong)

Nepal is a landlocked country that has been facing challenges in meeting its energy demand. The country is heavily dependent on imported fossil fuels, which are expensive and have negative environmental impacts.

Nuclear energy is the energy that is released from the nucleus of an atom through a process called nuclear reaction. Nuclear reactions can occur spontaneously or can be induced by bombarding the nucleus with particles such as neutrons.

However, Nepal currently does not have any nuclear power plants, and the country has not developed any nuclear energy infrastructure. Therefore, the development of nuclear energy in Nepal would require significant investment in terms of time, money, and human resources. Additionally, there are concerns about the safety and security of nuclear energy, and these issues would need to be addressed before nuclear energy could be developed in Nepal.

Despite these challenges, there are some potential benefits to the development of nuclear energy in Nepal. Nuclear energy has the potential to provide a reliable source of energy that is not dependent on imported fossil fuels. Additionally, nuclear energy is a low-carbon source of energy that could help Nepal reduce its greenhouse gas emissions and mitigate the impacts of climate change.

In conclusion, the development of nuclear energy in Nepal is a complex issue that requires careful consideration of the potential benefits and risks. While nuclear energy could provide a reliable and low-carbon source of energy, there are significant challenges that would need to be addressed before nuclear energy could be developed in Nepal.

Learn more about nuclear energy here:

https://brainly.com/question/2409175

#SPJ4

Answer:

H3PO4 + 3KOH -> K3PO4 + 3H20

Answer:

hope its helpful to uh....

Based on the molarity of the solutions;

pH is the negative logarithm to base ten of the hydrogen ions concentration of a solution.

pOH is the negative logarithm to base ten of the hydroxide ions concentration.

Also;

For HCl:

pH = -log [H3O+]

pH =-log (0.200)

pH = 0.699

Then;

poH= 14-0.699

pOH = 13.301

For NaOH:

pOH= -log [OH-]

= -log (0.0143)

pOH = 1.845

Then;

pH= 14-poH

= 14- 1.845

pH = 12.16

For HNO3:

pH= -log[H3O+]

=-log(3.0)

= -0.4771

Then;

pOH = 14-9-0.4771

pOH = 14.4771

For [Ca(OH)2]

molarity = 0.0031M

2 moles of OH- are produced

[OH-]= 2 × 0.0031

[OH-] = 0.0062M

pOH = - log[OH-]

=-log(0.0062)

=-log(6.2x10-3)

=-(-2.21)

pOH = 2.21

Then;

pH =14-2.21

pH =11.79

Learn more about pH and pOH at: https://brainly.com/question/13557815

55.845 g/mol of the mass of cans in the box we brought had a mass of 23kg. 411.74 mol moles we have.

To determine the number of moles of tin cans you have, we need to know the molar mass of the metal that the cans are made of. Tin cans are usually made of steel, which is an alloy made primarily of iron and carbon, with small amounts of other elements.

To convert the mass of the cans (23 kg) to moles, we need to use the following formula:

moles = mass / molar mass

moles = 23,000 g / 55.845 g/mol = 411.74 mol

Therefore, the number of moles of iron in the 23 kg of tin cans is approximately 411.74 mol.

Learn more about  molar mass here:

https://brainly.com/question/12127540

#SPJ4

Answer:

they all look like they are

Explanation:

Answer:

Only A and B are redox

Explanation:

Redox reactions are ones where elements change their oxidation states. That means any reactions that involve free elements that are also in compounds, ex: Na in a) is in both 2Na and 2NaCl are redox because their oxidation states change from 0 to whatever in the compound. This means A and B are redox reactions.

For C, (CO3) has a charge of -2, and reactants have charges C = +4, O = -2, and H = +1

The product compounds are all zero charge, so charges C = +4 and O = -2 makes CO2 charge 0 and H = +1 and O = -2 also gives H2O a zero charge. Since al elements of reactants are products do not have a change in charge, it is not redox.

Note that Oxygen is almost always at a charge of -2, that should help you with  calculations.

Similarly in d), (NO3) has charge -1, with charge N = +5, O = -2, and Pb = +2.

K tends to have charge +1 and I -1.

For d) reactants, Pb = +2 and I = -1 still gives PbI2 a zero charge. KNO3 also leaves it a zero charge.

Therefore d) also does not have any charge change in elements so it is not redox

The features of a standard hydrogen electrode are :

1. Temperature of 298 K (25°C)

2. Carbon electrode

3. Hydrogen gas at 1.01 x 10^5 Pa (1 atm) pressure

4. Electrolyte solution containing a hydrogen ion activity of 1 mol/L

5. Platinum wire as the current collector

6. A Potential of 0.00 V (relative to the hydrogen gas)

These features are what make up the Standard Hydrogen Electrode (SHE). The temperature of 298 K is the temperature at which the SHE is calibrated and is the standard temperature used in most laboratory experiments. The carbon electrode serves as the interface between the hydrogen gas and the electrolyte, and the hydrogen gas is held at 1.01 x 10^5 Pa (1 atm) pressure. The electrolyte solution contains a hydrogen ion activity of 1 mol/L, which is necessary for the electrode to function properly. A platinum wire is used as the current collector, and the electrode has a potential of 0.00 V, relative to the hydrogen gas. All of these features are necessary for the SHE to function properly and for the electrode to serve as the reference for all other electrochemical measurements.

To know more about electrodes refer to the link  brainly.com/question/17060277

#SPJ4

The incorrect statement in this case is statement i. A solution cannot be a gas. A gas is not a solution on its own, but it can be a component in a mixture or a solution.

A mixture is a combination of two or more substances that are not chemically combined and can exist in any state - solid, liquid, or gas. A solution, on the other hand, is a homogeneous mixture where one substance (the solute) is dissolved in another substance (the solvent). The solute can be a solid, liquid, or gas, but the solvent must be a liquid.
Statement ii is correct. A solution can be homogeneous or heterogeneous. A homogeneous solution has uniform composition throughout, meaning that the solute is evenly distributed in the solvent. In contrast, a heterogeneous solution has non-uniform composition, meaning that the solute is not evenly distributed in the solvent.
Statement iii is also correct. A solution is a homogeneous mixture. This means that the solute is evenly distributed in the solvent to create a uniform composition. A homogeneous mixture has the same properties and composition throughout, and the components cannot be visibly distinguished from each other.

In summary, a solution cannot be a gas, but it can be a homogeneous mixture of a solid, liquid, or gas dissolved in a liquid solvent. A mixture can exist in any state and can be homogeneous or heterogeneous, while a solution is always a homogeneous mixture.

To learn more about gases:

https://brainly.com/question/22817140

#SPJ11

Answer:

4.  0.5 kilometers (1st option)

5.  0.1 00 liters (last option)

Explanation:

500 meters to kilometers

4.

1 kilometer = 1000 meters

We use the formula SBD (SMALL TO BIG DIVIDE) i hope this helps you

500 ÷ 1000

= 0.5 kilometers

5.

100 milliliter to liter

SBD

100 ÷ 1000

= 0.1 00 liters

Answer:

The Kinetic energy decreases

Explanation:

because the speed of the molecules slows down.

Answer:

What exactly are you asking?

Explanation:

I am unsure, this reaction is a balanced reaction by default if that was what you were asking.

Answer:

Fibre optic technology.

Explanation:

Fibre optic technology, as the name implies, uses light pulses to transmit data via strands of glass or plastic. It's the preferred technology for the government's National Broadband Network (NBN), which offers 100Mbps+ download speeds.

From the reaction of 74.2 g of N2 and 14.0 moles of H2, approximately 3.18 x 10^24 molecules of NH3 can be produced.

To determine how many molecules of NH3 can be produced from the reaction of 74.2 g of N2 and 14.0 moles of H2, we need to use the balanced chemical equation for the reaction:

N2 + 3H2 -> 2NH3

First, let's convert the mass of N2 to moles. The molar mass of N2 is 28.02 g/mol, so:

74.2 g N2 * (1 mol N2/28.02 g N2) = 2.64 mol N2

Next, we need to determine the limiting reactant. To do this, we compare the moles of N2 and H2 in a 1:3 ratio. Since there are 2.64 moles of N2 and 14.0 moles of H2, we divide the moles of each reactant by their respective coefficients in the balanced equation:

2.64 mol N2 / 1 = 2.64
14.0 mol H2 / 3 = 4.67

The mole ratio tells us that for every 1 mole of N2, we need 3 moles of H2. Since we have more moles of H2 (4.67) than moles of N2 (2.64), H2 is in excess, and N2 is the limiting reactant.

Now we can calculate the moles of NH3 produced. According to the balanced equation, 1 mole of N2 produces 2 moles of NH3. So:

2.64 mol N2 * (2 mol NH3/1 mol N2) = 5.28 mol NH3

Finally, we can convert moles of NH3 to molecules. Avogadro's number tells us that 1 mole of any substance contains 6.022 x 10^23 molecules. Therefore:

5.28 mol NH3 * (6.022 x 10^23 molecules NH3/1 mol NH3) = 3.18 x 10^24 molecules NH3

Therefore, from the reaction of 74.2 g of N2 and 14.0 moles of H2, approximately 3.18 x 10^24 molecules of NH3 can be produced.

Learn more about reaction here:-

https://brainly.com/question/16737295

#SPJ11

Answer:

The pressure will be 4.27 atm.

Explanation:

Gay-Lussac's law can be expressed mathematically as follows:

\(\frac{P}{T} =k\)

Where P = pressure, T = temperature, K = Constant

This law indicates that the quotient between pressure and temperature is constant.

This law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.

You want to study two different states, an initial state and a final state. You have a gas that is at a pressure P1 and a temperature T1 at the beginning of the experiment. By varying the temperature to a new value T2, then the pressure will change to P2, and the following will be fulfilled:

\(\frac{P1}{T1} =\frac{P2}{T2}\)

In this case:

Replacing:

\(\frac{4 atm}{293 K} =\frac{P2}{313 K}\)

Solving:

\(P2= 313 K* \frac{4 atm}{293 K}\)

P2= 4.27 atm

The pressure will be 4.27 atm.

We have to determine the molecular formula of a compound. We know that its empirical formula is CH. To find the molecular formula we have to compare the molar mass of the empirical formula with the molar mass of the compound (65.09 g/mol).

Let's start determining the molar mass of the empirical formula. The atomic masses of C and H are:

C: 12.01 amu H: 1.01 amu

With those values we can calculate the molar mass of CH:

molar mass of CH = 1 * 12.01 + 1 * 1.01

molar mass of CH = 13.02 g/mol

If we divide the molar mass by the molar mass of the empirical formula we will get the relationship between them.

x = molar mass/molar mass of the empirical formula

x = 65.09 g/mol / (13.02 g/mol)

x = 5

Finally to get the molecular formula we have to multiply each element by that ratio.

Answer: C₅H₅ is the molecular formula.