Which process is spontaneous?

These comprise variables that you alter to test a hypothesis, variables that you measure to ascertain findings, and variables that you maintain constant to design an experiment that is legitimate.

The fundamental categories of variable that are pertinent to experiments are as follows. A variable that is altered as part of an experiment is known as an independent variable. constant variables used throughout the investigation. the amount of water provided to each plant, the room's temperature and lighting conditions, and other factors. Three dependent and one independent variables make up this experiment. The biomass of the crops during harvest is the dependent variable. The definition of your variables and the choices you make regarding their manipulation and measurement are crucial components of experimental design.

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The statement the force of gravity attracts the sun and all the other planets in the solar system toward each other is True.

The force of gravity is a universal force of attraction that exists between any two masses in the universe. It is the force that gives objects weight and keeps them bound to the Earth's surface. The force of gravity is equal to the mass of an object multiplied by the gravitational constant.

Therefore, with this data, we can see that it is True that the gravitational pull between the sun and all the other planets in the solar system causes them to be drawn toward one another.

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The compound octane is a hydrocarbon with the molar mass of 114.26 g/mol. It contains 8 carbon atoms and 18 hydrogens. Hence, the molecular formula is C₈H₁₈.

Hydrocarbons are organic compounds containing carbon -hydrogen bonds. Alkanes are saturated hydrocarbons with the general formula of CₙH₂ₙ₊₂.

Given the molar mass of octane  = 114.26 g/mol

mass of hydrogen = 18.17 g.

atomic mass of H = 1.009 g/mol

then, number of moles of H  = 18.17 /1.009 = 18 moles.

Thus, there are 18 hydrogens.

Now, the mass of carbons = 114.26 -18.17 = 96.6 g

atomic mass of carbon = 12 g/mol

no.of moles of carbon = 96.6/12 = 8 moles

Thus, there are 8 carbons.

Therefore, the molecular formula of octane is C₈H₁₈.

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The equilibrium constant, Ka, for the acid is 1.08 x [tex]10^{-13}[/tex].

For the equilibrium constant, Ka, for a monoprotic acid, we can use the relationship between the acid's dissociation constant (Ka) and the acid's concentration and the pH of the solution.

The relationship between the acid's dissociation constant (Ka), the acid's concentration (c), and the pH of the solution (pH) is given by the following equation:

Ka =   [tex]\frac{(H+)^{2}}{HA}[/tex]          

Where [H+] is the concentration of hydrogen ions in the solution, [HA] is the concentration of the acid, and [A-] is the concentration of the conjugate base.

We know that the acid concentration is 0.0126 M and the pH of the solution is 6.51. We can use this information to calculate the hydrogen ion concentration in the solution using the following equation:

pH = -log[H+]

[H+] =  [tex]10^{-pH}[/tex]

[H+] = [tex]10^{-6.51}[/tex] = 3.16 x [tex]10^{-7}[/tex]

So, the hydrogen ion concentration in the solution is 3.16 x 10^-7 M

We can now use this information to calculate the equilibrium constant, Ka, for the acid:

Ka =  [tex]\frac{(H+)^{2}}{HA}[/tex]

Ka =  [tex]\frac{(3.16 * 10^{-7}) ^{2} }{ 0.0126}[/tex]

Ka = 1.08 x [tex]10^{-13}[/tex]  

So, the equilibrium constant, Ka, for the acid is 1.08 x [tex]10^{-13}[/tex].

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Answer:

The correct response is:

1• Cu(1)CI 5.00 A, 10 min Mass of Cu deposited =4.97g

This is true because by using Faraday's laws of electrolysis, the mass of copper deposited is directly proportional to the current and time.

The molar mass of copper is 63.5 g/mol, and the Faraday constant is 96485 C/mol.

Cu(1)CI has a current of 5.00 A and a time of 10 min, so the mass of Cu deposited can be calculated as:

mass of Cu deposited = (5.00A * 10min * 96485C/mol) / (63.5g/mol) = 4.97g

The other options are not true as they don't match the given current and time.

The reaction you provided is a combination of an oxidation-reduction (redox) reaction and an acid-base reaction. The oxidation-reduction component of the reaction is the conversion of As(III) to As(V) and the conversion of NO3- (nitrate) to NO (nitric oxide). The acid-base component of the reaction is the conversion of H+ (hydrogen ions) to H2O (water).

Here is the step-by-step oxidation-reduction reaction:

As(III) (arsenite) is oxidized to As(V) (arsenate) by losing electrons:

As(III) → As(V) + 3e-

NO3- (nitrate) is reduced to NO (nitric oxide) by gaining electrons:

NO3- + 4H+ + 4e- → NO + 2H2O

The electrons lost by As(III) are gained by NO3-:

As(III) + NO3- → As(V) + NO + 2H2O

The acid-base component of the reaction is the conversion of H+ (hydrogen ions) to H2O (water) by reacting with the water generated by the oxidation-reduction reaction:

2H+ + 2H2O → 4H+

The overall balanced equation of this redox reaction is:

As₂O3 + H+ + NO3- → H₂ASO4 + NO

Please note that As₂O₃ is Arsenic trioxide and H₂ASO₄ is Arsenic Acid and NO is Nitric oxide.

According to law of definite proportion, the ratio of elements in calcium carbonate is always fixed. Thus on mole of calcium carbonate is 100 g which contains one Ca atom weighs 40 g. Thus,200 g of CaCO₃ contains 80 g of Ca.

Law of definite proportion states that, every compound will maintain a definite proportion of its constituent elements always irrespective of the source and method of preparation.

Therefore, all the elements in a compound will be in a fixed ratio with total mass of the compound. There is only one Ca in one formula unit of CaCO₃.

atomic mass of Ca = 40 g/mol

molar mass of CaCO₃ = 100 g/mol/

Hence, 100 g of CaCO₃ contains 40 g of Ca, if 200 g of CaCO₃ is taken, the mass of Ca doubles to 80 g to keep the definite proportion of the composition.

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To find out how many meters the skydiver fell, you can use the formula:

distance = speed x time

distance = 10 m/s x 15 seconds

distance = 150 meters

Therefore, the skydiver fell 150 meters during his 15-second fall.

Speed is a scalar quantity that describes how fast an object is moving. It is typically measured in units of distance per time, such as meters per second (m/s) or kilometers per hour (km/h).

Speed is different from velocity, which is also a measure of an object's movement, but velocity is a vector quantity and it describes an object's speed in a certain direction. Speed is the magnitude of velocity and it's a scalar quantity which only describes how fast an object is moving without considering direction. The formula for speed is distance traveled divided by the time it takes to travel that distance.

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The chemical formula of the ionic crystal is Ca₄F₈ (option D).

Ionic crystal in chemistry is a crystalline form of an ionic compound.

According to this question, an ionic crystal is depicted in the attached image. The green balls represent fluoride ions while the blue balls represent calcium ions.

Based on the ionic crystal, there are four (4) calcium ions and eight (8) fluoride ions, hence, the formula of the ionic crystal is Ca₄F₈.

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The following is the letter explaining how ground water could heat the air in the school.

Dear David Li,

Thank you for your concerns about the proposed groundwater heating system for Riverdale School. I understand your concern that 30°C water may not have enough energy to heat the school, but I assure you that the groundwater system is designed to effectively heat the air in the school.

The groundwater system works by pumping warm water from underground wells into a heat exchanger. The heat exchanger then transfers the heat from the water to the air, which is then circulated throughout the school via a forced air system. This process increases the temperature of the air in the school, providing warmth to the students and staff.

In terms of the temperature of the school, it is important to note that the proposed groundwater system is designed to maintain a stable temperature in the school. This means that the system will work to keep the air temperature at a comfortable level, regardless of the outside temperature. The stable temperature in the school will provide an optimal learning environment for the students, allowing them to focus on their studies.

I hope this explanation clarifies how the groundwater system can effectively heat the air in the school and provides the necessary stability for the students to focus on their learning. If you have any further questions or concerns, please do not hesitate to reach out.

Sincerely, [Your Name]

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The net ionic reaction for each of the reaction is

a) [tex]3Pb^{2+} + 6Cl^----- > 3PbCl{2}[/tex]

b) [tex]3Sr^{2+} + 2PO_{4} ^{3-} ---- > Sr_{3}( PO_{4}) _{2}[/tex]

c) [tex]2Ag^+ + 2I^- --- > 2AgI[/tex]

d) [tex]Cu^+ + CO_{3} ^{2-} ----- > Cu_{2} CO_{3}[/tex]

We have to note that if we talk about the net reaction equation, we can be able to talk about the final ionic reaction after we have removed the spectator ions. Note that when we speak of the spectator ions, we mean the ions that do not take part in the reaction.

In this case, we have been give the precipitate in each of the reactions and we can use the formula of the precipitate to be able to deduce the net ionic reaction that took place.

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B. Water. Water is the most abundant chemical in the living organisms.Water is essential to all living things because it is involved in many chemical processes .

that occur within their cells and bodies. The universal solvent, water, functions as a medium for the chemical processes to take place. Additionally, substances that have been dissolved are transferred throughout the body from one area to another. Water is present in great quantity in living things. It is the only polar molecule found in living things that can passively diffuse through a cell membrane. It serves as one among the building blocks for photosynthesis and is essential for several metabolic processes. The most prevalent element found in living things, oxygen, makes up around 65% of the mass of the entire body.  that have been dissolved are transferred throughout the body from one area to another.

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0.13 gram of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate.

The term molarity is defined as the number solute dissolve in per litre of solution.

The balanced chemical equation that describes this double replacement reaction is as follows:

2NaOH + ZnSO₄ ⇒ Zn(OH)₂  + Na₂(SO)₄

Notice that you need 2 moles of sodium hydroxide in order to react with

1 mole of zinc(II) sulfate and produce 1 mole of zinc(II) hydroxide.

Use the molarities and volumes of the two solutions to figure out how many moles of each reactant you are mixing together.

0.00275 moles of NaOH

0.00379 moles of zinc sulphate

0.00379 moles of zinc sulphate × 2 mole NaOH / 1 mole zinc sulphate

= 0.00759

0.00137 moles of zinc oxide × 99.42 / 1 mole zinc hydroxide

= 0.13 gram

Thus, 0.13 gram of precipitate forms when 22.0ml of 0.125mol sodium hydroxide reacts with 34.5ml of 0.110mol zinc sulfate.

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If an observer in the northern hemisphere was to face south at noon on January 1, they would be presented with a unique sight.

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The molecular formula of the hydrocarbon having 82.76 % carbon and hydrogen is [tex]C_{4} H_{10}[/tex].

Hydrocarbon are defined as an organic compound consisting of hydrogen and carbon. These are the examples of group 14 hydrides. Hydrocarbons are colorless compounds and these are hydrophobic. The  odors of hydrocarbons are weak.

Suppose we have 100 g of the given compound. if there are 82.76 g of carbon then it should have 17.24 g of hydrogen in it.

The molar mass of carbon is 12.01 g/mol.

The molar mass of hydrogen is 1.01 g/mol.

We have to calculate the number of moles.

Number of moles of carbon = 82.76 g / 12.01g/ mole

                                                = 6.89 mole

Number of moles of Hydrogen = 17.24 g / 1.01g/ mole

                                                      = 17.07 mole

Now we have to divide the moles of carbon and hydrogen by the smallest value.

For carbon, 6.89 mole / 6.89 mole = 1

For Hydrogen, 17.07 mole / 6.89 mole = 2.5

Then the ratio becomes 2: 5. so the empirical formula is [tex]C_{2}H_{5}[/tex] having the weight of 29.07 g / mole.

n = molecular mass / weight of empirical

  = 58.1 g/ mole / 29.07 g / mole

  = 2

so the molecular formula becomes 2 * [tex]C_{2} H_{5}[/tex] = [tex]C_{4} H_{10}[/tex] .

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The complete question is,

What is the molecular formula for a compound that composed of 82.76% carbon having a molecular mass of 58.1 g/mole and is composed solely of carbon and hydrogen?

molecular formula is [tex]C{4H{10} }[/tex] for the hydrocarbon compound consisting of carbon and hydrogen.

An organic substance made up of hydrogen and carbon is referred to as a hydrocarbon. These group 14 hydride examples are shown. Hydrocarbons are invisible molecules that repel water. Hydrocarbons have hardly detectable smells. Consider that we have 100 g of the specified chemical. 17.24 g of hydrogen should be present if there are 82.76 g of carbon.

Carbon has a molar mass of 12.01 g/mol.

Hydrogen has a molar mass of 1.01 g/mol.

We must determine the amount of moles.

Number of moles of carbon = 82.76 g / 12.01g/ mol = 6.89 mole

Number of moles of Hydrogen = 17.24 g / 1.01g/ mol = 17.07 mole

The next step is to divide the moles of hydrogen and carbon by the least number. 6.89 mole / 6.89 mole equals one for carbon.

17.07 moles / 6.89 moles of hydrogen equal 2.5

Then, the ratio changes to 2 to 5. Therefore, the empirical formula weighs 29.07 g per mole.

n = empirical weight / molecular mass

29.07 g/mole / 58.1 g/mole = 2

Consequently, the molecular equation is 2 * [tex]C_{2} H_{5\\}[/tex] = [tex]C_{4} H_{10}[/tex]

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The complete question is,

What is the molecular formula for a compound that composed of 82.76% carbon having a molecular mass of 58.1 g/mole and is composed solely of carbon and hydrogen?

the specific heat capacity of the metal is  0.3427 J/g°C.

Water mass is 140.0 g.

Water started out at a temperature of 20.0 °C.

100 g is the mass of a specific metal.

Metal's initial temperature is 95.0°C.

Water and metal's combined final temperature is 24.6°C.

The water will gain heat because its initial temperature is lower than that of the metal, which will lose heat because it is at a greater initial temperature. Therefore, heat obtained by water equals heat lost by metal.

formula: (mass water)(finalT- initalT) = (mass metal)(initialT- finalT)(Cp metal) ( Cp water)

after entering the provided info we obtain,

(100g )(95°C -24.6°C)

(140.0g)(24.6°C–20.0°C) = (Cp metal) (4.184 J/g°C)

The formula is (100g)(70.4°C)(Cp metal)=(140.0g)(4.6°C)(4.184 J/g°C)

7863.7 g°C = 2694.5 J (Cp metal)

Cp metal = 2694.5% J/7863.7% g°C

Cp of metal therefore equals 0.3427 J/g°C.

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1. 2Na : Cl2

2. 24 and 36.

3. The reactant mass is 372 grams and the product mass is 372 grams.

4. 3.92 moles

The enthalpy change for a reaction where activation energy for both forward and reverse reactions is the same value is zero.

Enthalpy change (ΔH) is a measure of the heat absorbed or released during a chemical reaction. It is the difference in the enthalpy of the reactants and products. The activation energy (Ea) is the energy required to overcome the energy barrier between the reactants and products to allow a chemical reaction to occur.

If the activation energy for both the forward and reverse reactions of a chemical process is the same value, it means that the energy required to go from reactants to products is the same as the energy required to go from products to reactants. Therefore, the enthalpy change of the reaction is zero. The enthalpy change of the reaction is given by the difference in the enthalpy of the reactants and products.

ΔH = H(products) - H(reactants)

Therefore, if the activation energy for the forward and reverse reactions is the same, the enthalpy change for the reaction is zero.

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CH4 is non polar, co and CH3CL is polar and dipole-dipole and dispersion,NH3 is hence hydrogen-bonding, dipole-dipole, and dispersion.

Being non-polar, CH4 As a result, it will only disperse!

Since co and CH3cl are both polar, they will dipole. Interaction

Mey cannot create hydrogen bonds since neither NO nor GDF have been damaged by hydrogen.

Therefore, co and CH3cl are merely dipole-dipole and dispersion.

Because H is connected to its hydrogen atoms, NH can create hydrogen bonds.

NH3 is hence hydrogen-bonding, dipole-dipole, and dispersion.

Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least contain LDF.

Classify each substance based on the intermolecular forces present in that substance. Hydrogen bonding, dipole-dipole, and dispersion Dipole dipole and dispersion only Dispersion onlyof 1.CH4, 2. co and ch3cl 3. nh3

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2 of 1H NMR signals for this isomer of xylene and the ratio 1:1 in which they appear.

An aromatic hydrocarbon called xylene is utilised extensively as a solvent in both industry and medical technologies. It is a colourless, sweet-smelling liquid or gas that is present in crude wood spirit but also naturally exists in petroleum, coal, and wood tar. Its chemical formula is C6H4(CH3)2, and it is known as dimethyl benzene because it has a six-carbon ring that has two methyl groups linked to it. The three isomeric forms of it are ortho-, meta-, and para-xylene. In the production of coke fuel, the catalytic reforming process and coal carbonization result in the production of xylene, an essential petrochemical. Depending on the source, it can also be found in crude oil in concentrations ranging from 0.5% to 1%.

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Answer:

-a covalent bond.

Explanation:

As sodium chloride is soluble in water, it will dissolve in water and being insoluble calcium carbonate will make precipitate, which can be separated easily.

To separate calcium carbonate and sodium chloride follow the steps given below:-

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The specific aims that you want the project to achieve are known as project objectives.

Every choice made throughout the project life cycle will be influenced by the project objectives, which is why it's so important to articulate them as clearly as possible at the outset.

Using the SMART methodology for creating project management objectives is one of the greatest ways to ensure that your project goals are clear and explicit.

PMs and their teams may plan projects effectively and guarantee on-time, on-budget delivery by using SMART project objectives.

Therefore, The specific aims that you want the project to achieve are known as project objectives.

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In the given scenario, the order of activity from most active to least active is zinc, iron and lead.

The activity of an element in a chemical reaction is determined by its ability to participate in the formation of a compound. In this case, zinc is replacing both iron and lead, meaning it is more active than both of those elements and considered to be the most active element. Iron is only replacing lead, making it less active than zinc but more active than lead.

Lead is the only element that is being replaced, making it the least active element among the three. This order of activity is based on the relative ability of these elements to participate in chemical reactions and form compounds.

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Basalt is an ingenious salt which is found near the surface. Limestone fossils are found in sedimentary sequences and they are old by 2.7 billion years. Sand stones with trilobites are old about 500 million years.

Rocks are the major parts of the tectonic plates of earth, There are broadly three classes of rocks namely, sedimentary rocks, igneous rocks and metamorphic rocks.

Basalt is a type of well grained igneous rocks found near the surface of earth. Rapid cooling of lava rich in Mg and Ca composes Basalt rock

Limestone, a form of carbonate sedimentary rock composed primarily of calcium carbonate (CaCO3). The minerals calcite and aragonite, which are various crystal forms of CaCO3, make up the majority of its material. When these minerals separate from water that has dissolved calcium, limestone is created.

Sileous sandstone is a typical component of nearshore deposits about 500-600 million years of age. This often grades into siltstone and shale as it moves into the sea, with finer-grained sediment accumulating in deeper water to create these rocks.

Shale rocks with ammonites have an age of about 70 million years. Ammonites are spiral shaped fossilized shells of marine animals.

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Sodium chloride solution that can be prepared from the stock solution is 2,000 mLA.

A 0.45% sodium chloride solution needs to be prepared. A 1,000 ml supply of sodium chloride 0.9% is available at the drugstore. As directed by your doctor, the final amount of the 0.45% sodium chloride solution that can be prepared from the stock solution is 2,000 mLA. This solution is typically supplied by injection into a vein. It can be given at home, in a doctor's office, or in a hospital. If you intend to use this product at home, ask your health care practitioner for all preparation and usage instructions. Check the product visually for any specks or dis-coloration before using. In the event of either, do not use the liquid. If you intend to combine this solution with another medication, check with your doctor or pharmacist first before acting, do this. Find out how to handle and dispose of medical supplies properly. Your age, weight, health, and how you respond to treatment all go into the dosage.

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60 years must pass to reduce a 25 mg sample of cesium 137 to 6.25 mg.

A first-order reaction is one in which the rate of reaction is linearly dependent on the concentration of only one reactant, ie. in a first-order reaction, the rate is affected by changes in the concentration of only one of the reactants. Radioactive decay is an first order reactio of chemical kinetics.

Equation of first order reaction is : kt = 2.303 log [A₀]/[A]

Given, half life = 30 years means that k(30) = 2.303 log [A₀]/[A₀/2]

k(30) = 2.303 x log 2

k(30) = 2.303 x 0.3010

k(30) = 0.693

k = 0.693/30

k = 0.0231

Now, we know the value of k. Putting this value in the first order reaction :-

kt=2.303 log [A₀]/[A]

0.693/30 x t(in years) = 2.303 log 25/6.25

(log2 x 2.303 x t)/30 = 2.303 log 4

(log2 x 2.303 x t)/30 = 2.303 x 2log2

t/30 = 2

t=60years

Other approach would be, in this first order reaction of chemical kinetics, according to question, one half life passes. After one half life, amount of radiactive substance becomes half. So, if initially we had 25 mg of cesium-137, after one half life, we'd have half of this value = 12.5 g remaining cesium-137. After another half life, we'd have half of this value = 6.25 mg. Hence, we reached the required amount of sample in 2 half lives = 2 x 30 years = 60 years.

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Account for a relative atomic mass of magnesium that was less than usual on another planet Because the atomic mass stated is a weighted average of such different isotopes.

The amount of neutrons within the nucleus can cause two atoms of the same element to possess the same Atomic Number however a different Relative Atomic Mass. Isotopes were elements having varying mass numbers. The quantity of electrons has no effect on the relative atomic mass.

The weight in grams of both the number of atoms from an element represented in 12.00 g of carbon-12 was described as the element's absolute atomic mass. To determine the relative atomic mass of chlorine, take the average mass of one chlorine atom and multiply it by 100.

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The molar mass of a compound is defined as the sum of the molar masses of the various elements that makes up the compound.

The molar mass of the medication, C₁₇H₂₀O₅S can be obtained as follow:

Molar mass of C₁₇H₂₀O₅S = (17 × 12) + (20 × 1) + (5 × 16) + 32

Molar mass of C₁₇H₂₀O₅S = 204 + 20 + 80 + 32

Molar mass of C₁₇H₂₀O₅S = 336 g/mol

The number of mole of medication in one tablet can be obtained as follow:

Mole = mass / molar mass

Number of mole of one tablet = 0.125 / 336

Number of mole of one tablet = 0.000372 mole

The number of mole of firocoxib that Dobby takes each day can be obtained as follow:

Mole = mass / molar mass

Number of mole of tablets taken each day = 0.1875 / 336

Number of mole of tablets taken each day = 0.000558 mole

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Some solute will precipitate If a supersaturated solution is introduced to a mechanical disturbance or a seed crystal.

Any disruption or addition of a seed crystal will cause the solute to precipitate out of solution and crystallize in a supersaturated solution, which is a sensitive system.When the concentrations are on the solubility curve, saturation (crystallization and condensation) takes place. The solution is referred to as supersaturated if the concentrations are higher than the solubility curve. Supersaturation can happen through three different mechanisms: precipitation, nucleation, and metastable. In rare circumstances, it is possible to make a solution that behaves strangely and contains more solute than is found in a saturated solution. This is known as a supersaturated solution. Supersaturated solution or super solution is the term used to describe such a solution.

complete question:If a supersaturated solution is introduced to a mechanical disturbance or a seed crystal, what will happen?

Select the correct answer below:

there will be further dissolution

some solute will precipitate

the solution will heat up

depends on the solution

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