The question is in the photo

Answer:

6.0 x 10³ - 2.3 x 10³ = 3700

3700 ---------> 3.7 x 10³

7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.

Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]

Avogadro's number is the number of particles in one mole of substance. 6.022 × 10²³ is known as Avogadro's Constant / Avogadro's Number.

Avogadro's Number = 6.022 × 10²³

Now put the values in above formula we get

Number of moles = [tex]\frac{\text{Given number of atoms}}{\text{Avogadro's Number}}[/tex]

                             = [tex]\frac{4.41 \times 10^{24}}{6.022 \times 10^{23}}[/tex]

                             = 7.32 moles

Thus from the above conclusion we can say that 7.32 moles of Chromium is present in 4.41 × 10²⁴ atoms.

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The percentage yield of the oxygen gas is 60%.

The reaction equation is;

2H^+ + H2O2 + 2MnO4 -> 2MnO2 + 4H2O + 3O2

Number of moles of hydrogen peroxide = 30/1000 * 0.30 M = 9 * 10^-3 moles

Number of moles of  potassium permanganate = 30/1000 * 0.30 M = 9 * 10^-3 moles

Now;

1 mole of H2O2 reacts with 2 moles of permanganate

 9 * 10^-3 moles of H2O2 reacts with  9 * 10^-3 moles * 2 moles/1 mole  

= 1.8 * 10^-2 moles

Hence, permanganate is the limiting reactant

b) The theoretical yield of oxygen is;

2 moles of oxygen produced 3 moles of O2

9 * 10^-3 moles oxygen  produced 9 * 10^-3 moles *  3 moles/2 moles

= 0.0135 moles

If 1 mole of O2 occupies 22.4 L

0.0135 moles of O2 occupies 0.0135 moles * 22.4 L/ 1 mole

= 0.302 L or 302 mL

c) Percentage yield of oxygen = 178 mL/ 302 mL * 100/1

= 60%

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Answer:

I'm thinking you should go for the option C.

The pH of the solution is obtained to be 9.67.

A buffer is a solution that serves to militate against changes in acidity or alkalinity. The buffer is often made of a solution of a strong acid and its salt or a weak base and its salt.

Now we have the that;

Number of moles of base = 250 /1000 *  0.80 = 0.2 moles

Number of moles of salt = 150/1000 *  0.50 = 0.075 moles

Total volume of the solution = 250 + 150 = 400 mL or 0.4 L

Molarity of the base = 0.2 moles/0.4 L = 0.5 M

Molarity of the salt =  0.075 moles/ 0.4 L = 0.1875 M

pKb = - log( 1.8 x 10^-5) = 4.74

pOH = pKb + log [salt/base]

pOH =  4.74 + log (0.1875/ 0.5)

pOH = 4.33

pH = 14 - 4.33

pH = 9.67

The pH of the solution is obtained to be 9.67.

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Answer:

D.) Zn + H₂SO₄ ----> ZnSO₄ + H₂

Explanation:

Single-Replacement Reaction: a reaction in which an element in a compound is swapped with another element

    ex.) Zn + H₂SO₄ ----> ZnSO₄ + H₂

Double-Replacement Reaction: a reaction in which a cation in one compound is swapped with a cation in another

    ex.) Ba(OH)₂ + H₂SO₄ ----> BaSO₄ + 2 H₂O

Synthesis Reaction: a reaction in which two or more elements/compounds combine to form a new molecule

    ex.) 2 Mg + O₂ ----> 2 MgO

    ex.) H₂O + CO₂ ----> H₂CO₃

According to the research, a hazard is the real possibility that we will suffer some harm. An example of a hazard is free toxic gases.

It is associated with situations that have potentially harmful effects on the body, the environment or property.

In chemistry, it is understood as those conditions of potential health damage caused by uncontrolled exposure to chemical agents of various kinds, such as the release of toxic and flammable gases such as ethanol.

Therefore, we can conclude that according to the research, a hazard is the real possibility that we will suffer some harm. An example of a hazard is free toxic gases.

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Answer: PINK

Explanation:

Answer:

At Anode: oxidation occurs i.e loss of electrons

At cathode: reduction occurs i.e gain of electrons

OPTION 1 is the correct answer

Filling out the table of elements below following the outlined order:

An element can be defined as a substance that can not be broken down into simpler substances.

An element serves as a building blocks for compounds and mixtures.

In conclusion, each element and its property as requested in the table are given above.

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1.2 x 10² L of oxygen is formed if 77.37 L of water is produced.

The density of water at STP = 0.99 g/ ml but we will assume 1 g/ml

Determine the mass of water ([tex]H_{2}[/tex]o) = 77.37 L × [tex]\frac{1000 ml}{1l}[/tex] × [tex]\frac{1g}{ml}[/tex]

The mass of water = 77370 g

Convert mass into moles = 77370 [tex]H_{2}[/tex]o × [tex]\frac{1mol}{18.01528} H _{2}O[/tex]

= 4294.6876 mol of [tex]H_{2} O[/tex]

Use stoichiometry to find how many mols of oxygen [tex]o_{2}[/tex] were used:

= 4294.6876 mol of [tex]H_{2} O[/tex] × [tex]\frac{13 mol }{10 mol}[/tex]

= 5583.0939 mol [tex]o_{2}[/tex]

Convert mols to mass = 5583.0939 mol ×[tex]\frac{32 g}{mol }[/tex]

= 178659.0059 g [tex]o_{2}[/tex]

Convert mass into liters

The density of [tex]o_{2}[/tex] at STP = [tex]\frac{1.439}{ml}[/tex]

Density of [tex]o_{2}[/tex] = 1.2 × [tex]10^{2}[/tex]

Hence,1.2 x 10² L of oxygen is formed if 77.37 L of water is produced.

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1.2 x 10² L of oxygen is formed  if 77.37 L of water are produced at STP. The term is derived from the Greek word "oxy genes," which means "forms acid." a periodic table column that is vertical.

What is oxygen ?

The chemical element oxygen has an atomic number of 8. At normal temperatures and pressures, oxygen transforms into the chemical compound (O2) of two atoms, which is a colorless gas.

The density of H₂O at STP = 0.99 g ÷ ml, but we will assume 1 g/ml

The mass of  H₂O = 77370 g

Use stoichiometry to find  moles of oxygen given by

= 4294.6876 mol of X

= 5583.0939 mol

Convert moles into mass = 5583.0939 mol X

= 178659.0059 g

Then convert it into liter. 1.2 x 10² L of oxygen is formed  if 77.37 L of water.

Thus, 1.2 x 10² L of oxygen is formed  if 77.37 L of water are produced at STP.

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The proper name of the compound is now 1,1 - dihydroxy-3-phenyl propene.

Firstly we know that the parent chain is based on propane. Now we have three substituents on that parent chain. Two hydroxy moieties and one phenyl moiety.

The proper name of the compound is now 1,1 - dihydroxy-3-phenyl propene.

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The correct order is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f. The correct option is B.

The correct order of energy sublevel is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.

Thus, with the exclusion of 5s, 5p, 6s, 5d, 6p, 7s, 5f, 6d, and 7p, what we have left in order of increasing energy is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f.

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The correct order from least to greatest energy for the energy sublevels is;  1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f (Option B).

The Aufbau principle offers a method in which the energy levels in an atoms are arranged from the least to the greatest. We know that electrons are filled into orbitals in order of increasing energy.

Thus, the correct order from least to greatest energy for the energy sublevels is;  1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 4d, 4f (Option B).

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The molecule is water. Molecular formula of water is H₂O. Molecular weight of water is 18 g. The percentage composition of hydrogen and oxygen in water is 11.11 % and 88.89 %. Intermolecular force in water is dipole-induced dipole and London dispersion.

Name of the molecule is Water. Molecular formula of the compound is H₂O.

Molecular mass of H₂O = 2 × Atomic weight of H + Atomic weight of O

                                       = 2 × 1 + 16

                                       = 2 + 16

                                       = 18

The water molecule is Covalent because hydrogen atoms share electrons with the oxygen atom.

Percentage composition = [tex]\frac{\text{Mass of element}}{\text{Molar Mass}}[/tex]

Now,

Molar mass of Water = 18

Percentage composition of hydrogen = [tex]\frac{2}{18} \times 100[/tex]

                                                               = 11.11 %

Percentage composition of Oxygen = [tex]\frac{16}{18} \times 100[/tex]

                                                            = 88.89 %

In water molecule dipole-induced dipole and London dispersion forces are present because water has H-bonds.

The given molecule is water. Water is important for human body to keep a normal temperature. It carries nutrients. It protects our body organs and tissues. The function of water is to serves a s a lubricant. It helps to prevent constipation. It makes up Saliva.

Thus from the above conclusion we can say that The molecule is water. Molecular formula of water is H₂O. Molecular weight of water is 18 g. The percentage composition of hydrogen and oxygen in water is 11.11 % and 88.89 %. Intermolecular force in water is dipole-induced dipole and London dispersion.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Questions: Choose one molecule that is vital to the human body. Provide the following information: Name of the molecule

Now, provide the following information: Molecular formula

Now, provide the following information about your chosen molecule: Molecular mass

Now, provide the following information about your chosen molecule: The type of molecule (covalent or ionic)

Now, provide the following information about your chosen molecule: Percent composition of each element

Now, provide the following information about your chosen molecule: Intermolecular forces within the molecular

Now, provide the following information about your chosen molecule: Describe why the molecule is important and its function within the human body.

Answer:

Explanation:

yogurt is a colloid because of the milk/dairy in it. yogurt is a complex colloid.

As yogurt includes living bacterial cultures, proteins, lipids, and milk solids in addition to water, yoghurt is a colloid.

Yoghurt is a colloid because it contains living bacterial cultures, proteins, lipids, and milk solids in addition to water. A colloid forms a homogenous mixture rather than settling or separating over time because the particles or components are uniformly distributed throughout the medium. A water-in-oil emulsion, specifically yoghurt is regarded as an emulsion colloid. This implies that water droplets are evenly distributed across an ongoing fat or oil matrix. The matrix of yoghurt is made up of milk solids, proteins, and lipids, and the water phase is present as droplets. Lactic acid is produced when bacteria in the bacterial culture, including Lactobacillus bulgaricus and Streptococcus thermophilus, ferment milk's lactose.

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Answer:

CH3CH2OH

Explanation:

CH3CH2OH the ethanol is regarded as neutral since pH is very close to 7 and CH3CHO or acetaldehyde is an extremely weak basic max pH of 8.

Answer:

Options

*A) 60 cm3 = Correct.* This is the answer

B) 10 cm3

C) 40 cm3

D) 30 cm3

E) 70 cm3

Explanation:

Molecular simulation is the part of the drug discovery life cycle that most likely uses quantum computing.

Drug discovery refers to the process to identify and validate medications in pharmaceutical research.

Drug discovery exploits computational approaches based on quantum modeling to accelerate this process.

In conclusion, molecular simulation is the part of drug discovery associated with quantum computing.

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Taking into account the definition of dilution, the concentration of the new solution is 1 mol/L.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

6 mol/L× 200 mL= Cf× 1200 mL

Solving:

(6 mol/L× 200 mL)÷ 1200 mL= Cf

1 mol/L= Cf

In summary, the concentration of the new solution is 1 mol/L.

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Taking into account the reaction stoichiometry, 2.713 grams of aspirin are formed when 2.08 grams of salicyclic acid reacts.

In first place, the balanced reaction is:

C₄H₆O₃ + C₇H₆O₃ (Salicyclic Acid) →C₉H₈O₄ (aspirin) + C₂H₄O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 138 grams of salicyclic acid form 180 grams of aspirin, 2.08 grams of salicyclic acid form how much mass of aspirin?

[tex]mass of aspirin=\frac{2.08 grams of salicyclic acidx 180 grams of aspirin}{138 grams of salicyclic acid}[/tex]

mass of aspirin= 2.713 grams

Then, 2.713 grams of aspirin are formed when 2.08 grams of salicyclic acid reacts.

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Answer:

0.396 J/g°C (to 3 sf)

Explanation:

50.0 = 10.6(24.9-13.0)(c)

c = 0.396 J/g°C (to 3 sf)

The thermodynamics of leaching of ilmenite in hydrochloric acid for titania pigment production is an industrial production of nano-sized titanium dioxide (TiO2).

Thermodynamics is defined as the change in the energy of system that brings about work in that system.

The leaching of ilmenite which is a titanium-iron oxide mineral with HCl can lead to the production of titanium dioxide (TiO2).

The use of thermodynamics in this process controls the heat and energy of the leaching system leading to a better yield of final products.

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Answer:

you will taste the flavour of the food

The percent yield of the reaction that produced 0.350 mol HCI is 83.17%

Actual yield = 0.35 × 36.5

Actual yield = 12.775 g

Percentage yield = (Actual / Theoretical) × 100

Percentage yield = (12.775 / 15.36) ×100

Percentage yield = 83.17%

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Answer:

Oxidation - K

Reduction - Cu

Explanation:

2K --> 2K^+

Cu^+2 --> Cu

Answer: 962 torr

Explanation:

Answer:

424 °C

Explanation:

If all other variables are held constant, the missing temperature can be found using the Charles' Law equation:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final temperature.

V₁ = 435 mL                    V₂ = 842 mL

T₁ = 219 °C                       T₂ = ? °C

V₁ / T₁ = V₂ / T₂                                          <----- Charles' Law

435 mL / 219 °C = 842 mL / T₂                <----- Insert values

1.9863 = 842 mL / T₂                               <----- Simplify left side

(1.9863) x T₂ = 842 mL                             <----- Multiply both sides by T₂

T₂ = 424 °C                                              <----- Divide both sides by 1.9863

The volume of the CO₂ produced at STP, given the data is 141 mL

P₁V₁ / T₁ = P₂V₂ / T₂

Where

P₁V₁ / T₁ = P₂V₂ / T₂

(99.81 × 156) / 298 = (101.325 × V₂) / 273

Cross multiply

298 × 101.325 × V₂ = 99.81 × 156 × 273

Divide both sides by 298 × 101.325

V₂ = (99.81 × 156 × 273) / (298 × 101.325)

V₂ = 141 mL

Thus, the volume of the CO₂ produced at STP is 141 mL

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Answer:

Option (2)

Explanation:

The two compounds formed will be AgCl and NaNO₃.

We can see that this will result in a balanced equation, so the answer is Option (2).

Answer:

B) NaNO3 + AgCl (s)

Explanation:

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