3. how many moles are present in 10.0 g of aluminum(Al)​

Answer:

They cannot be broken down any further

Explanation:

An element is a substance that cannot be broken down into a simpler format. They are distinguished by a unique atomic number. The elements are organized by their atomic number in the periodic table, which highlights elements with similar properties.

Answer:

50.6g Al would be needed

Explanation:

Based on the reaction:

4Al + 3O₂ → 2Al₂O₃

4 moles of aluminium react with 3 moles of oxygen to produce 2 moles of Al₂O₃

To solve this question we need to find the moles of 45g of O₂. Then using the chemical equation find the moles of Al and its mass:

Moles O₂ -Molar mass: 32g/mol-:

45g O₂ * (1mol / 32g) = 1.41 moles O₂

Moles Al:

1.41 moles O₂ * (4mol Al / 3mol O₂) = 1.875 moles Al

Mass Al -Molar mass: 26.98g/mol-:

1.875 moles Al * (26.98g / mol) =

50.6g Al would be needed

The amount of aluminum that would be required to completely react with 45 grams of O2 would be 50.59 grams.

From the balanced equation of the reaction:

\(4 Al + 3 O_2 ---> 2 Al_2O_3\)

The mole ratio of Al to O2 is 4:3.

Mole of 45 grams of O2 = mass/molar mass

                                     = 45/32

                                           = 1.4063 moles

Equivalent mole of Al: 4 x 1.4063/3

                                    = 1.875 moles

mass of Al = mole x molar mass

                 = 1.875 x 26.98

                  = 50.59 grams

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Answer:

3

Explanation:

Applying,

\(2^{n'}\) = R/R'............... Equation 1

Where n' = number of halflives that have passed, R = Original atom of the substance, R' = atom of the substance left after decay.

From the question,

Given: R = 40 atoms, R' = 5 atoms

Substitute these values into equation 1

\(2^{n'}\) = 40/5

\(2^{n'}\) = 8

\(2^{n'}\) = 2³

Equation the base,

n' = 3

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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a. False. In the same OSM (Operating System Memory), it is not necessary for all pages to have the same size. Different pages can have varying sizes depending on the memory allocation requirements of the system.

b. False. In the same OSM, all segments do not need to have the same size.

Segments can have different sizes based on the specific needs of the programs or processes running in the system.

Segmentation allows for flexible memory allocation by dividing the memory into logical segments.

c. True. Internal fragmentation occurs when memory is divided into smaller areas to accommodate smaller data blocks, but the remaining memory within each block is too small to be utilized for another block.

As a result, these small unused portions of memory remain empty, leading to inefficient memory utilization.

This is a disadvantage of the paging architecture employed in a computer's memory management system. It can result in wasted memory space and lower overall system performance.

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There are approximately 12.7 grams of phosphorus in a 50-gram sample of aluminum phosphate.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to know the molar mass and the chemical formula of aluminum phosphate.

The chemical formula for aluminum phosphate is AlPO4. It indicates that each molecule of aluminum phosphate contains one aluminum atom (Al), one phosphorus atom (P), and four oxygen atoms (O).

To calculate the molar mass of aluminum phosphate, we can add up the atomic masses of its constituent elements based on their stoichiometric ratios:

Molar mass of AlPO4 = (molar mass of Al) + (molar mass of P) + (4 * molar mass of O)

Using the periodic table, we can find the atomic masses of the elements:

Molar mass of Al = 26.98 g/mol

Molar mass of P = 30.97 g/mol

Molar mass of O = 16.00 g/mol

Now, let's calculate the molar mass of aluminum phosphate:

Molar mass of AlPO4 = (26.98 g/mol) + (30.97 g/mol) + (4 * 16.00 g/mol)

= 121.95 g/mol

The molar mass of aluminum phosphate is 121.95 g/mol.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to calculate the mass fraction of phosphorus in the compound. The mass fraction is the ratio of the molar mass of phosphorus to the molar mass of aluminum phosphate.

Mass fraction of phosphorus = (molar mass of P) / (molar mass of AlPO4)

= (30.97 g/mol) / (121.95 g/mol)

≈ 0.254

Multiplying the mass fraction by the mass of the sample gives us the grams of phosphorus:

Grams of phosphorus = (mass fraction of phosphorus) * (mass of the sample)

= 0.254 * 50 g

≈ 12.7 g

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Answer:

C. a substance changing from the liquid state to the solid state.

Explanation:

Answer:

C

Explanation:

C

Hydrogen is said to be positively charged and not negatively charged.

A hydrogen atom loses an electron, becoming positively charged (it has a charge of +1), and this creates a hydrogen ion. Due to the fact that a hydrogen atom only possesses one proton and no electrons, a hydrogen atom is frequently referred to as only a proton.

A proton in the nucleus of a hydrogen atom is surrounded by one electron. In order to form a full outer shell and become more stable, hydrogen usually loses this electron or shares it with another atom in a covalent bond. Hydrogen is only one proton thick when its electron is removed, giving it a positive charge.

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Answer:

We are to name the compound:

Assuming carbon is represented by the big gray atoms while the smaller ones represents hydrogen atoms and the the red atom represents oxygen, the chemical formula of the compound is:

CH3CH2CH2OH

The simplest straight-chain alkynes containing seven to twelve carbons are:

1. Heptyne (7 carbons)

2. Octyne (8 carbons)

3. Nonyne (9 carbons)

4. Decyne (10 carbons)

5. Undecyne (11 carbons)

6. Dodecyne (12 carbons)

Here are the structures and names of the simplest straight-chain alkynes containing seven to twelve carbons:

1. Heptyne:

  Structure: H-C≡C-C≡C-C≡C-C≡C-H

  Name: 1-Heptyne

2. Octyne:

  Structure: H-C≡C-C≡C-C≡C-C≡C-C≡C-H

  Name: 1-Octyne

3. Nonyne:

  Structure: H-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-H

  Name: 1-Nonyne

4. Decyne:

  Structure: H-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-H

  Name: 1-Decyne

5. Undecyne:

  Structure: H-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-H

  Name: 1-Undecyne

6. Dodecyne:

  Structure: H-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-C≡C-H

  Name: 1-Dodecyne

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The two geologic events which occur very slowly as a result of tectonic forces and movement are convection in the mantle and plate subduction.

This is a term which is referred to as the process in which there is collision between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate.

This is caused by geologic events which occur very slowly as a result of tectonic forces while on the other hand, mountains and volcanoes occur abruptly which is therefore the reason why options A and C were chosen as the correct choice.

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Answer: A and C

Explanation:

To predict the rate constant at 542 K using the given activation energy and the rate constant at 701 K, we can apply the Arrhenius equation. By substituting the values into the equation, we can calculate the rate constant at the desired temperature.

To predict the rate constant at 542 K using the given activation energy (Ea = 1.50 x 10^2 kJ/mol), we can use the Arrhenius equation:

k2 = k1 * e^(-Ea / (R * T2))

where k1 is the rate constant at the known temperature (701 K), k2 is the rate constant at the desired temperature (542 K), Ea is the activation energy, R is the gas constant (8.314 J/(mol*K)), and T2 is the temperature in Kelvin (542 K).

First, we need to convert the activation energy from kJ/mol to J/mol by multiplying it by 1000:

Ea = 1.50 x 10^2 kJ/mol * 1000 J/1 kJ = 1.50 x 10^5 J/mol

Now, we can calculate the rate constant at 542 K:

k2 = 2.57 M^(-1)s^(-1) * exp(-1.50 x 10^5 J/mol / (8.314 J/(molK) * 542 K))

k2 ≈ 2.57 M^(-1)*s^(-1) * exp(-34.84)

Using the above calculation, we can determine the rate constant at 542 K.

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Answer:

21.0g of CO2

Explanation:

The molarity of NaOH solution is 0.114 M.

Given, Mass of flask and vinegar solution= 25.17 g.Mass of flask= 15.12 gVolume of vinegar solution (in mL)= 10.00 mlInitial volume of NaOH (in mL)= 0.00 mlFinal volume of NaOH (in mL)= 39.00 mlThe Mass of vinegar solution is 10.0503 g.The volume of NaOH used in titration is 39.00 ml.Let's calculate the molarity of the NaOH solution.First, calculate the moles of NaOH used in the reaction. Moles of NaOH = Molarity × Volume of NaOH (in L) Converting volume in mL to L,Volume of NaOH used = 39.00 mL = 39.00/1000 L = 0.0390 LThe molarity of NaOH solution is given by;Molarity of NaOH = Moles of NaOH / Volume of vinegar solution (in L)Converting volume in mL to L,Volume of vinegar solution = 10.00 mL = 10.00/1000 L = 0.0100 LNow, substituting the values; Molarity of NaOH = 0.114 M.

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Understanding physical properties of matter is essential in everyday life for a variety of purposes, from cooking to choosing materials.

Knowledge of physical properties of matter is extremely important in everyday life as it helps us understand the nature of substances we come into contact with. One example is the use of boiling points in cooking. Different substances have different boiling points which determine the temperature at which they boil. This information is crucial in determining cooking times and ensuring that food is cooked properly.

For instance, water boils at 100 degrees Celsius, while sugar syrup boils at a much higher temperature. If the wrong temperature is used, food may be undercooked or overcooked, leading to undesired outcomes. Knowledge of physical properties also helps in choosing the right materials for different purposes, such as choosing heat-resistant materials for cooking.

In conclusion, understanding physical properties of matter is essential in everyday life for a variety of purposes, from cooking to choosing materials.

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There are 2.23 moles of C2H6 gas in 50.0L at STP. To determine the number of moles in a given volume of gas at STP, we can use the ideal gas law equation.

The ideal gas law equation is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature. At STP, the pressure is 1 atm and the temperature is 273.15 K. So the calculation is

PV = nRT

n = \(\frac{P.V}{R.T}\)

n = \(\frac{(1 atm) (50 L)}{(0.0821 L.atm/mol.K)(273.15K)}\)
n = 2.23 mol

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Answer:

Explanation:

6 electrons

carbon dioxide, C has atomic number 6 so it has 6 electrons and oxygen has atomic no 8, i.e 16 electrons.

Answer:

In the water molecule oxygen combines with two hydrogens and so has a valency of 2. A simple diagram of a water molecule makes this plain. The hydrogen atoms are each sharing one pair of electrons - they have a valency of 1. The oxygen atom is sharing two pairs of electrons - it has a valency of 2.

HClO will not dissociate completely in water among the given option.

When acids dissolve in water, they can dissociate into ions. Strong acids dissociate completely, while weak acids only partially dissociate. To determine which acid will not dissociate completely, we need to identify the weak acid among the options.

HClO is a weak acid known as hypochlorous acid. It does not dissociate completely in water. Instead, it partially dissociates into H⁺ and ClO⁻ ions.

On the other hand, HCl, HClO₄, and HNO₃ are strong acids and dissociate completely in water, producing H⁺ ions. These strong acids are considered to be fully ionized in aqueous solutions.

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Answer:

no there is no bonds between the two of these

Answer:

Explanation:Science is the scholarly and down to earth movement, including the efficient investigation of the structure and the laws of nature with intensive trial and pragmatic perception. Science is isolated into three branches: Natural sciences, Social sciences, formal sciences.

Science offers new information and revelations of many things we do not know. Day by day, science is progressing. Now science has helped man reach the moon, which was once unknown to man as a satellite. Every invention in technology or medical techniques is based on science and scientific research

Ionic compounds have a net charge of what ?

zero

Any ionic compound will have a net charge of zero. Another way of saying this is that cations and anions must always combine in such a way so that their charges cancel.

Answer:zero

Any ionic compound will have a net charge of zero. Another way of saying this is that cations and anions must always combine in such a way so that their charges cancel.

Explanation:

Answer:

384.9 mL.

Explanation:

What is given?

Volume 1 (V1) = 823.7 mL.

Pressure 1 (P1) = 351.8 torr.

Pressure 2 (P2) = 752.9 torr.

What do we need? Volume 2 (V2).

Step-by-step solution:

This is a Boyle's Law problem. Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases.

The formula of the law is:

Where P is pressure and V is volume. We want to find volume 2, 'V2'. So let's solve for 'V2' and replace the given data that we have in the new formula:

The new volumewill be 3384.9 mL You can note as the pressure is increasing, the volume is decreasing.

Answer: SMALLEST is lithium

LARGEST is Fluorine

Explanation:

The enthalpy change of the given reaction is negative, so the reaction is an exothermic reaction.

Enthalpy change of a reaction is the energy changes that occur when reactant molecules form products.

Enthalpy is the heat content of a substance.

When enthalpy change is positive, the heat content of the product is greater than that of the reactant and the reaction is an endothermic reaction.

Whereas, when enthalpy change is negative, the heat content of the reactant is greater than that of the product and the reaction is an exothermic reaction.

Therefore, since the enthalpy change of the given reaction is negative, the reaction is an exothermic reaction.

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