Describe the properties of noble gases. Based on their electronic arrangement

The grams of H₂ produced, if the chemical reaction produces 129 grams of  AlCl₃ are 2.92 grams. (Option b)

To determine the grams of H₂ produced, we need to use the balanced equation and the molar ratios between AlCl₃ and H₂.

From the balanced equation:

2 moles of AlCl₃ react with 3 moles of H₂

To find the moles of AlCl₃ produced:

129 grams AlCl₃ x (1 mole AlCl₃ / molar mass AlCl₃) = moles of AlCl₃

Now, using the molar ratios, we can determine the moles of H₂ produced:

moles of AlCl₃ x (3 moles H₂ / 2 moles AlCl₃) = moles of H₂

Finally, we can convert the moles of H₂ back to grams:

moles of H₂ x (molar mass H₂ / 1 mole H₂) = grams of H₂

Let's calculate it:

Given:

Mass of AlCl₃ produced = 129 grams

Molar mass of AlCl₃:

Al: 26.98 g/mol

Cl: 35.45 g/mol x 3 = 106.35 g/mol

Total molar mass = 26.98 g/mol + 106.35 g/mol = 133.33 g/mol

Calculations:

moles of AlCl₃ = 129 g AlCl₃ / 133.33 g/mol = 0.9676 moles AlCl₃

moles of H₂ = 0.9676 moles AlCl₃ x (3 moles H₂ / 2 moles AlCl₃) = 1.4514 moles H₂

grams of H₂ = 1.4514 moles H₂ x (2.02 g/mol / 1 mole H₂) = 2.93 grams of H₂

Therefore, the correct answer is b. 2.92 grams.

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Answer:

9*(10+9)

(90+81)

(171) is the answer

The water and the solutes leave the capillaries at the arterial end because the blood pressure is the greater than the osmotic pressure at the arterial end.

The blood pressure is the greater than the osmotic pressure at the arterial end and the water molecules  and the solutes leave the capillaries at the arterial end. At the arterial end of capillary, the blood pressure is exceeds the limit of the the osmotic pressure, that will causes the  net movement of the fluid out of the capillary.

Thus, due to the higher blood pressure than the osmotic pressure the solutes and the water leaves the artial end.

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A molecule can be formed by two or more Atoms joining together to form Chemical bonds

A molecule can be formed by two or more Atoms joining together to form Chemical bonds.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

A molecule is composed of a set number of atoms arranged in a specific pattern. The atoms are held in place by chemical bonds formed when atoms move close enough for orbitals to overlap and share electrons.

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Answer:

the answer is b, which is one

Answer:

5.31×10¯²³ g.

Explanation:

Data obtained from the question include:

Molar weight of O2 = 32 g/mol

Mass of 1 oxygen atom =..?

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.

This implies that 1 mole of O2 also contains 6.02×10²³ atoms.

1 mole of O2 = 32 g

The mass of 1 atom of O2 can be obtained as follow:

32 g of O2 contains 6.02×10²³ atoms.

Therefore Xg of O2 will contain 1 atom i.e

Xg of O2 = 32/6.02×10²³

Xg of O2 = 5.31×10¯²³ g

Therefore, the mass of a single oxygen atom is 5.31×10¯²³ g.

The mass of a single oxygen atom is 5.31 x 10⁻²³ grams. Therefore, option D is correct.

The molecular weight of oxygen gas is 32 g/mol. To find the mass of a single oxygen atom, divide the molecular weight by Avogadro's number (6.022 x 10²³ atoms/mol).

Avogadro's number (6.022 x 10²³) represents the number of particles (atoms, molecules, or ions) in one mole of a substance.

To find the mass of a single oxygen atom, divide the molecular weight of oxygen gas by Avogadro's number:

Mass of a single oxygen atom = (32 g/mol) / (6.022 x 10²³ atoms/mol)

Simplifying the expression:

Mass of a single oxygen atom = 5.31 x 10⁻²³ g

Therefore, the mass of a single oxygen atom is 5.31 x 10⁻²³ grams.

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The statement 'On treatment with dilute \(H_{2}SO_{4}\), ethene forms ethanol' is true as ethanol is the main product of this reaction.

The reaction between ethene and dilute H2​SO4​ produces ethanol. This reaction is an example of hydration reaction, in which water is added to a compound. In this case, the water molecule is provided by the dilute sulfuric acid (H2​SO4​). The reaction can be represented by the following equation:CH2=CH2​ + H2​O → CH3​CH2​OH​.

In this reaction, the double bond between the two carbon atoms in ethene is broken, and a hydrogen atom and a hydroxyl group (-OH) are added to the two carbon atoms, forming ethanol. This reaction is typically carried out in the presence of a catalyst, such as phosphoric acid, to increase the rate of the reaction.

Answer: The enthalpy of combustion, per mole, of butane is -2657.4 kJ

Explanation:

The balanced chemical reaction is,

\(2C_4H_{10}(g)+13O_2(g)\rightarrow 8CO_2(g)+10H_2O(g)\)

The expression for enthalpy change is,

\(\Delta H=[n\times H_f_{products}]-[n\times H_f_{reactants}]\)

Putting the values we get :

\(\Delta H=[8\times H_f_{CO_2}+10\times H_f_{H_2O}]-[2\times H_f_{C_4H_{10}+13\times H_f_{O_2}}]\)

\(\Delta H=[(8\times -393.5)+(10\times -241.82)]-[(2\times -125.7)+(13\times 0)]\)

\(\Delta H=-5314.8kJ\)

2 moles of butane releases heat = 5314.8 kJ

1 mole of butane release heat = \(\frac{5314.8}{2}\times 1=2657.4kJ\)

Thus enthalpy of combustion per mole of butane is -2657.4 kJ

Water combines with carbon dioxide to produce slightly acidic groundwater

that dissolves limestone and forms caves.

This is because the reaction between water and carbondioxide to form

bicarbonate ions( HCO₃⁻). The bicarbonate ions dissociate into Hydrogen

atoms thereby increasing the acidity.

The acidic environment results in the formation of acidic groundwater that

dissolves limestone and forms caves.

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Answer:

hi

Explanation:

Answer:

Fleshy Fruits: All of most of the ovary wall (pericarp) is soft or fleshy at maturity. ... partitions, juicy seed vesicles, and a leathery exocarp similar to a hesperidium. ... This is a very common dry fruit found in many different plant families.

Explanation:

The water containing 2% starch solution will not change color immediately when lugol's iodine is added. A dialysis bag is a membrane that is semipermeable and holds the fluids that the kidneys normally remove. They are also used in the experiments.

A solution made of potassium iodide and iodine is known as lugol's iodine. The properties can be used as a reagent and an antiseptic and could be used to diagnose cancer. The iodine in Lugol's solution binds to glycogen's alpha-1,4 glucans, which are polysaccharides. This solution takes time to develop blue color when added to the 2% starch solution.

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Answer:

About 60 grams.  

Explanation:

The on point answer is 61.28 grams.

Using dimensional analysis with the labels of atoms or molecules, we found that there are 4.94 * 10²⁴ atoms of P, 7.41 * 10²⁴ atoms of Si, and 5.60 * 10²³ atoms of Mn in the given moles.

Here's a step-by-step explanation for each problem:
1.) 8.21 mol of P:
Step 1: Identify the conversion factor. In this case, we will use the Avogadro's number, which is 6.022 * 10²³ atoms/mol.
Step 2: Apply dimensional analysis using the given moles of P and the conversion factor.
(8.21 mol P) * ( 6.022 * 10²³ atoms/mol) = 4.94 * 10²⁴ atoms of P.
2.) 12.3 mol of Si:
Step 1: Identify the conversion factor. In this case, we will use the Avogadro's number, which is  6.022 * 10²³atoms/mol.
Step 2: Apply dimensional analysis using the given moles of Si and the conversion factor.
(12.3 mol Si) * ( 6.022 * 10²³ atoms/mol) = 7.41 * 10²⁴ atoms of Si.
3.) 0.93 mol of Mn:
Step 1: Identify the conversion factor. In this case, we will use the Avogadro's number, which is  6.022 * 10²³ atoms/mol.
Step 2: Apply dimensional analysis using the given moles of Mn and the conversion factor.
(0.93 mol Mn) * ( 6.022 * 10²³ atoms/mol) = 5.60 * 10²³ atoms of Mn.

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Percent yield = 78.7% , the correct answer is D) 78.7%, which represents the percent yield of NaCl in the reaction.

To calculate the percent yield of NaCl in the given chemical equation, we need to compare the actual yield of NaCl with the theoretical yield. The theoretical yield is the amount of NaCl that would be produced if the reaction went to completion based on stoichiometry.

First, we need to determine the theoretical yield of NaCl. By examining the balanced equation, we can see that the stoichiometric ratio between CuCl2 and NaCl is 1:2. This means that for every 1 mole of CuCl2, 2 moles of NaCl are produced.

Step 1: Convert the mass of CuCl2 to moles using its molar mass.

Molar mass of CuCl2 = 63.55 g/mol (atomic mass of Cu) + 2 × 35.45 g/mol (atomic mass of Cl)

Molar mass of CuCl2 = 134.45 g/mol

Moles of CuCl2 = 31.0 g / 134.45 g/mol ≈ 0.231 mol

Step 2: Use the stoichiometry to calculate the theoretical yield of NaCl.

Since the stoichiometric ratio between CuCl2 and NaCl is 1:2, the moles of NaCl produced will be twice the moles of CuCl2.

Moles of NaCl (theoretical) = 2 × 0.231 mol = 0.462 mol

Step 3: Convert the moles of NaCl to grams using its molar mass.

Molar mass of NaCl = 22.99 g/mol (atomic mass of Na) + 35.45 g/mol (atomic mass of Cl)

Molar mass of NaCl = 58.44 g/mol

Theoretical yield of NaCl = 0.462 mol × 58.44 g/mol ≈ 26.96 g

Now, we can calculate the percent yield using the formula:

Percent yield = (Actual yield / Theoretical yield) × 100

Percent yield = (21.2 g / 26.96 g) × 100 ≈ 78.7%

Option D

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Answer:

Two nuclei, heat energy, gamma radiations and neutrons are the products of nuclear fission reaction.

Explanation:

Element: Carbon

Mass number: 12

atomic number: 6

No of protons : 6

13.11 moles of methane is present in 7.9×\(10^{24}\) molecules of methane

The number of moles of a substance is nothing but the the ratio of its given mass in the chemical reaction to the mass of one mole of the substance. One mole of any substance equals Avogadro's number, that is, 6.023×\(10^{23}\). It is also used to express concentration units such as mole per liter or also molecular weight.

Avogadro's number, is the  number of units in one mole of any substance , is equal to 6.02214076 × \(10^{23}\). The units can  be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction as well.

According to Avogadro's law we can say that;

6.023×\(10^{23}\) molecules of methane  will contain 1 mole of methane.

Then we can calculate the number of moles present in 7.9×\(10^{24}\) molecules.

⇒ 7.9×\(10^{24}\) = 13.11 moles

6.023×\(10^{23}\)

Therefore 13.11 moles are present in the above given question.

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Liquid. It's volume stays the same but liquid changes shape based on what it's contained in

Answer:

a.

Explanation:

[character limit pass]

The circumstances that will cause a hurricane to increase in strength is if the hurricane moves over warmer water. Hence, option a is correct.

Hurricanes are stronger winds generated by high pressure difference.  They deteriorate quickly over land because it isolates them from the humidity and heat of tropical ocean water and causes more friction than the sea surface.

Even the warmest and most humid regions of land, like Florida's Everglades, will significantly reduce wind speeds and increase pressure in a hurricane's low-pressure center.

A storm will be greatly diminished if dry air is allowed to enter its center due to vertical wind shear. In addition, hurricanes lose strength when they cross colder water outside of the tropics.

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Answer:

Liquid

Explanation:

I just got it right (:

Answer:

the answer is 1. nonmetal; low

Answer:

B) On genes within chromosomes

Explanation:

Answer:

B) On genes within chromosomes

The diagram represents a nuclear fission reaction where a Uranium-235 nucleus absorbs a neutron, becomes unstable and splits into two fragments releasing energy and neutrons.

Nuclear fission is the process of splitting an atomic nucleus into two or more smaller nuclei with the release of energy, while nuclear fusion is the process of combining two or more atomic nuclei into a larger nucleus with the release of energy.

In a nuclear fission reaction, energy is released due to the conversion of a small amount of mass into a large amount of energy, in accordance with Einstein's famous equation E=mc^2. The release of energy occurs when the Uranium-235 nucleus splits into two fragments, releasing neutrons and gamma radiation in the process.

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The majority of the energy required for life on Earth is produced and maintained by photosynthesis, which is also substantially responsible for producing and maintaining the oxygen content of the atmosphere. 

6CO₂ + 6H₂O = 6O₂ + C₆H₁₂O₆

6 moles of water are required for 1 mole of glucose.

Therefore, 0.9 x 6 = 5.4 moles of water are needed for every mole of glucose.

5.4 x 18 = 97.2 g

Plants and other living things employ a process called photosynthesis to transform light energy into chemical energy that can then be released through cellular respiration to power the organism's activities. Carbohydrate molecules like sugars and starches, which are created from carbon dioxide and water, contain some of this chemical energy.

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Answer: 26kj

Explanation:

Just took the test and got it right :D

Answer:

i didn't understand the question properly but i think the answer will be that amount of hydrogen will decrease while amount of oxygen will be same

plsss mark as brainliest

Correct Answer: 0.01g

The scales and balances have various divisions and units that define the accuracy of the measurement system. The smallest division on the balance scale is 0.001 gm. This, option D is correct.

Scales have been defined as the measurement system that estimates the quantity of the various substances in various units including, centimeters, meters, kilograms, grams, milligrams, liter, milliliters, etc. These units are interconvertible.

1 gram is the while part of the gram unit, 0.1 shows one-tenth part of the gram, 0.01 shows the one-hundredth part of the gram, and 0.001 shows the thousandth part of the gram. one gram is the largest number on the scale and 0.001 gm is the smallest number on the balance.

Therefore, option D. 0.001 gm is the smallest number.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{9.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.282392..\)

We have the final answer as

Hope this helps you

The heat of formation of anhydrous aluminium chloride (Al₂Cl₆) is 953.0 kJ/mol.

To calculate the heat of formation of Al₂Cl₆, we need to use Hess's Law and add up the enthalpies of the reactions that lead to the formation of Al₂Cl₆.

The reaction we want to calculate is:

2Al(s) + 3Cl₂(g) → Al₂Cl₆(s)

We can break this down into the following steps:

Step 1: Al₂Cl₆(s) → Al₂Cl₆(aq)

ΔH₁ = -643.0 kJ/mol

Step 2: Al₂Cl₆(aq) → 2AlCl₃(aq)

ΔH₂ = -2 × (-1004.0 kJ/mol)/3 = 668.0 kJ/mol

Step 3: 2AlCl₃(aq) + 3H₂(g) → 2Al(s) + 6HCl(aq)

ΔH₃ = -AH₁ = -(-1004.0 kJ/mol) = 1004.0 kJ/mol

Step 4: 2H₂(g) + 2Cl₂(g) → 4HCl(g)

ΔH₄ = 2 × (-183.9 kJ/mol) = -367.8 kJ/mol

Step 5: 4HCl(g) → 4HCl(aq)

ΔH₅ = -4 × (-73.2 kJ/mol) = 292.8 kJ/mol

Now, we can add up the enthalpies of these steps to get the overall enthalpy of the reaction:

ΔHf°(Al₂Cl₆) = ΔH₁ + ΔH₂ + ΔH₃ + ΔH₄ + ΔH₅

= -643.0 kJ/mol + 668.0 kJ/mol + 1004.0 kJ/mol - 367.8 kJ/mol + 292.8 kJ/mol

= 953.0 kJ/mol

Therefore, the heat of formation of anhydrous aluminium chloride (Al₂Cl₆) is 953.0 kJ/mol.

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