Determine the number of moles in 1.5 x 10^25
atoms of iron.

Answer:

1c

2b

3a

Explanation:

Step 1: Write the general expression to calculate the freezing point depression

The freezing point depression is a colligative property, that can be calculated using the following expression.

ΔT = i × Kc × b

where,

i: van 't Hoff factor (number of ion particles per formula unit)

Kc:  cryoscopic constant (Kc for water: 1.86 °C.Kg/mol)

b: molality (moles of solute per kilogram of solvent)

All the solution have the same Kc and the same b (1 mol/1 kg = 1 m), so ΔTf variation will depend on i

Step 2: Calculate the freezing point of the Na₃PO₄ solution

Na₃PO₄ has 4 ions (3 Na⁺ and 1 PO₄³⁻), so i = 4.

ΔT = i × Kc × b = 4 × 1.86 °C.Kg/mol × 1 mol/kg = 7.44 °C

T = 0°C - 7.44 °C = -7.44 °C

Step 3: Calculate the freezing point of the CuSO₄ solution

CuSO₄ has 2 ions (1 Cu²⁺ and 1 SO₄²⁻), so i = 2.

ΔT = i × Kc × b = 2 × 1.86 °C.Kg/mol × 1 mol/kg = 3.72 °C

T = 0°C - 3.72 °C = -3.72 °C

Step 4: Calculate the freezing point of the C₆H₁₂O₆ solution

C₆H₁₂O₆ is a nonelectrolyte (it doesn't ionize), so i = 1

ΔT = i × Kc × b = 1 × 1.86 °C.Kg/mol × 1 mol/kg = 1.86 °C

T = 0°C - 3.72 °C = -1.86 °C

Answer:

A. In the Presense of a base

Explanation:

Just took the test from Edgunuity

Phenolphthalein turns pink in color in the presence of a base. Therefore, option A is correct.

Phenolphthalein is a chemical compound that is often used as an acid-base indicator. It is colorless in acidic solutions and pink or red in basic solutions.

Phenolphthalein is often used in titrations to determine the endpoint of a reaction between an acid and a base. It can also be used as a laxative or in forensic investigations to test for the presence of blood.

Phenolphthalein has a chemical formula of C₂₀H₁₄O₄ and is synthesized by reacting phthalic anhydride with phenol in the presence of a strong acid catalyst. It is also used as a pH indicator. phenolphthalein has been found to have potential health benefits, such as reducing the risk of cancer, improving digestion, and reducing inflammation. Therefore, option A is correct.

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Answer:

It’s answer #2

Explanation:

I only know this because i just got it wrong

The correct structural formula for the acid that is poured into the beaker is CH₃COOH.

Acetic acid is also called ethanoic acid. It is form as a byproduct of fermentation. It forms vinegar. Vinegar is 4 to 6% acetic acid with water.

It is widely used in homes as cleaning agent, in cooking, washing etc.

Thus, the correct option is 2, CH₃COOH.

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Answer:

Molarity = moles ÷ liters

to get moles of NaBr divide grams of NaBr by its molar mass (mass of Na + mass of Bromine)

Na = 22.989769

Br = 79.904

molar mass of NaBr = 102.893769

6.6g ÷ 102.893769 = 0.064143826 moles of NaBr

0.064143826 moles ÷ 0.60 liters = 0.1069 molar concentration or 11 %

Explanation:

Facilitar el movimiento y desplazamiento de objetos pesados reduciendo el rose del objeto contra el suelo, Obtener un movimiento circular por efecto de la fuerza de un liquido, en el caso de contadores, molinos, centrales hidroeléctricas y turbinas.

Transmitir el movimiento de un eje a otro como en el caso de las lavadoras, bicicletas y neveras. Reducir drásticamente el esfuerzo necesario para elevar y mover objetos, como en casos de pozos de agua y ascensores Transformar movimientos giratorios en otros movimientos o viceversa. ,

Answer:

I think the answer is 2mL.

Explanation:

i hope it help.

Answer: Mass is converted to the energy binding a nucleus together.

Explanation: a p e x

Mass is converted to the energy binding a nucleus together cause a mass defect.Hence , Option (C) is correct.

The actual atomic mass is less than the predicted mass calculated by adding the masses of nucleons.

This additional mass is accounted for by binding energy that is released when a nucleus is formed.

When a nucleus is formed, some of the mass is converted to energy and this results in the mass defect.

Therefore, Mass is converted to the energy binding a nucleus together cause a mass defect. Hence , Option (C) is correct.

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The correct answer is

C. -432.4 J/mol K

Answer: There are 0.0129 moles of silver present in 1.4 grams of silver (Ag).

Explanation:

Given: Mass of silver = 1.4 g

Number of moles is the mass of substance divided by its molar mass.

As molar mass of silver is 107.86 g/mol. Therefore, moles of silver are calculated as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{1.4 g}{107.86 g/mol}\\= 0.0129 mol[/tex]

Thus, we can conclude that there are 0.0129 moles of silver present in 1.4 grams of silver (Ag).

Answer:

Expensive and low storing capacity.

Explanation:

The storing of renewable energy is a big challenge for us because this renewable energy can't be stored for a long due to expensive and low storing capacity. There are two challenges about the storing of renewable energy is that the battery are very expensive and can store very less amount of energy which makes unable to store the renewable energy. The scientists should make a storing device which is not too much expensive and has more storage capacity.

Answer:

7.23x10^23 atoms

Explanation:

1 mole = 6.023x10^23

1.20 mole = 6.023x10^23 x 1.2

                = 7.23x10^23 atoms

The atoms present in 1.20 moles of copper is 7.23 × [tex]10^{23}[/tex] atoms.

A chemical element is made up of atoms, which are the basic components of ordinary matter.

Calculation of atoms

Given data:

n = 1.20 moles.

It is known that.

1 mole = 6.023 × [tex]10^{23}[/tex]

So, 1.20 moles = 6.023 ×  [tex]10^{23}[/tex]  × 1.2 = 7.23 ×  [tex]10^{23}[/tex]  atoms.

Therefore, number of atoms in copper will be  7.23 ×  [tex]10^{23}[/tex] atoms.

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Carbon has an outer shell consisting of 4 valence electrons. ... Thus, a carbon ion can have a charge of anywhere from -4 to +4, depending on if it loses or gains electrons. Although the most common oxidation states of carbon are +4 and +2, carbon is able to make ions with oxidation states of +3, +1, -1, -2, and -3.

Answer:

Explanation:

\we must convert the mass of NaCl in grams into moles. We do this by dividing by the molecular weight of NaCl (58.4 g/mole). Then, we divide the number of moles by the total solution volume to get concentration. The NaCl solution is a 0.1 M solution.

Answer:

0.125

Explanation:

boom

Answer:

C

Explanation:

energy from different sources leads to different types of rocks. energy inside the earth(volcanoes) melts rocks into liquid rock(molten larva) but energy from the sun(heat radiation) causes rock to weather(breakdown) into small pieces of rocks

Answer:

the frequency of photons [tex]v = 1.509\times10^{39}Hz[/tex]

Explanation:

Given:  first ionization energy of 1000 kJ/mol.

No. of moles of sulfur = 1 mole

[tex]\Delta E_1 = 1000KJ/mol[/tex]

We know that plank's constant

[tex]h = 6.626\times10^{-34} Js[/tex]

Let the frequency of photons be ν

Also we know that ΔE = hν

this implies ν = ΔE/h

[tex]= \frac{10^6J}{6.626\times10^{-34} Js}[/tex]

[tex]v = 1.509\times10^{39}Hz[/tex]

Hence, the frequency of photons [tex]v = 1.509\times10^{39}Hz[/tex]

Answer:

What is the question your asking?

Explanation:

All atoms of the same element have the same properties.

Answer:

one parent

Explanation:

As one parent cell divides it into two daughter cells and so on.

Answer:

18.6 ml

Explanation:

From the balanced equation given:

Volume of oxygen = 27.9 mL

From the equation, we will see that three moles of oxygen react with CS_2 to give two moles of sulfur dioxide (SO_2)

Also, three mL of O_2 yields two mL of SO_2

Now, to calculate the volume of SO_2; we have:

[tex]=27.9 mL \times \dfrac{2 mL \ of SO_2}{3 mL \ O_2}[/tex]

= 18.6 mL of SO_2

Answer:

A. heavy nuclei

Explanation:

They absorb neuyrons in order to hain stability.

[tex] \longrightarrow\sf \pmb {Exothermic \: Reaction}[/tex]

[tex] \tt \green {An \: exothermic \: reaction \: is \: indicated \: by \: writing \: “+Heat” \: or \: “+Heat \: energy” \: or \: “+Energy” \: on \: the \: products \: side \: of \: an \: equation.}[/tex]

Answer: Heat is included as one of the products.

Explanation:

Answer:

The correct answer is - 2770000 cm.

Explanation:

1 kilometer = 1000 meter

1 meter = 100 centimeter

1 kilometer = 100*1000 cm

1 km = 100000 cm.

then,

27.7 kilometers = 2.77 × 10^6 centimeters

So, 27.7 kilometers = 27.7 × 100000

= 2.77 × 106 or 2770000 centimeters.

Answer:

(b) fully filled valence s orbitals

Explanation:

Electron configuration of Be: 1s22s2

2s2 is fully filled

Answer:

Answer: Number of moles of KOH present in solution is 3.75.

Explanation:

0.1 moles

There are 0.1 moles of solute in 250 mL of 0.4 M solution.

1 Answer. 1 mol of NaOH

Answer:

1.96 × 10²⁴ molecules

Explanation:

Step 1: Given data

Mass of ethanol (m): 150. g

Step 2: Calculate the number of moles (n) corresponding to 150. g of ethanol

The molar mass of ethanol is 46.07 g/mol.

150. g × 1 mol/46.07 g = 3.26 mol

Step 3: Calculate the number of molecules in 3.26 moles of ethanol

To convert moles into molecules, we need Avogadro's number: there are 6.02 × 10²³ molecules in 1  mole of molecules.

3.26 mol × 6.02 × 10²³ molecules/1  mol = 1.96 × 10²⁴ molecules

Answer:

1 mole.

Explanation:

1.6x10^23 = NA = 1 mole of any substance.

Answer:

I think the answer is C. D. And F.

Explanation:

I’m sorry if I’m wrong :(

Answer:

I think the answer is BCD and maybe F

Explanation:

Answer:

The answer is C = 9.52

Explanation:

I took the test

The pOH of a solution that has a pH of 4.48 at 25°C is 9.52. Details about pH can be found below.

pH refers to the power of hydrogen in a substance while the pOH refers to the power of hydroxyll ions. The pH of a solution ranges from 0 - 14 indicating the strength of acidity and alkalinity.

The relationship between the pH and pOH in a solution is given as follows:

pH + pOH = 14

According to this question, a solution at 25 degrees celsius has a pH of 4.48. The pOH of the solution is calculated as follows:

4.48 + pOH = 14

pOH = 14 - 4.48

pOH = 9.52

Therefore, the pOH of a solution that has a pH of 4.48 at 25°C is 9.52.

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