What is the percent of Ca in
Ca(C2H3O2)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
[?] % Ca

To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent.

Effect of Solvent:

H2O = most soluble

alcohol = least soluble

glycerin = intermediate solubility

The salt is most soluble in water because salt is an ionic compound and water is a polar solvent. "Like dissolves like" means that substances with similar polarity and intermolecular forces tend to dissolve each other. Water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other, while salt is an ionic compound made up of positively and negatively charged ions. The partial charges on the water molecule can interact with the ions of salt, causing the salt to dissolve.

The choice of solvent affects the dissolving process because it determines the ability of the solvent to interact with the solute. Solvents that are similar in polarity and intermolecular forces to the solute tend to dissolve the solute more easily.

Effect of Pulverizing:

crystal = longest dissolving time

pulverized = shortest dissolving time

The dissolving rates are different because pulverizing the salt increases its surface area, exposing more salt to the solvent and allowing for a greater opportunity for the solute-solvent interactions to occur.

Effect of Temperature:

cold = longest dissolving time

hot = shortest dissolving time

Increasing the temperature of the solvent increases the kinetic energy of the solvent molecules, which leads to more frequent and energetic collisions with the solute particles, resulting in faster dissolving rates.

Effect of Stirring:

stirred = shorter dissolving time

unstirred = longer dissolving time

Stirring increases the rate of the dissolving process by helping to disperse the solute particles evenly throughout the solvent, increasing the surface area of the solute that is in contact with the solvent, and promoting the mixing of the solute and solvent.

Conclusions:

To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent, and stir the solution to disperse the solute particles evenly throughout the solvent.

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Answer: Brainlest Please!

Explanation:

To determine how many bars Alexander should pack, we first need to calculate the energy required for the uphill climb and the return trip. We can use the formula for gravitational potential energy to calculate this:

Energy required = m * g * h

where m is the mass of Alexander and his backpack, g is the acceleration due to gravity, and h is the height of the mountain.

First, we need to convert Alexander's weight from pounds to kilograms:

180 lb * (1 kg / 2.205 lb) = 81.65 kg

Assuming Alexander's backpack weighs 10 kg, his total mass is:

m = 81.65 kg + 10 kg = 91.65 kg

Next, we need to convert the height of the mountain from meters to joules:

5620 m * 91.65 kg * 9.81 m/s^2 = 5,029,669 J

Since Alexander assumes he will need as much energy for the return trip, the total energy required is:

2 * 5,029,669 J = 10,059,338 J

Now, we can calculate the number of bars required to provide this amount of energy.

Each bar weighs 100 g, and contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.

First, we need to calculate the total energy per bar:

10 g of fat * 9 Cal/g + 40 g of protein * 4 Cal/g + 50 g of carbohydrates * 4 Cal/g = 410 Cal

Next, we can calculate the number of bars required:

10,059,338 J * (1 Cal / 4.184 J) * (1 bar / 410 Cal) = 605 bars

Therefore, Alexander should pack approximately 605 nutrition bars for his trip up and down Mt. Krumpett.

Enthalpy change, H, for this reaction per mole of X is thus equal to 0 J/mol.

The amount of heat that the calorimeter, q cal, gains may be calculated using the formula qcal = Ccalt, where t is the change in temperature that the mixture experiences.

The equation: can be used to compute the enthalpy change, H.             ΔH = q / n

The heat absorbed by the water can be calculated using the equation:

q1 = m1 x c1 x ΔT1

m1 = 21.0 g = 0.0210 kg (since the density of water is 1.00 g/mL)

c1 = 4.18 J/(g⋅∘C)

ΔT1 = 25.0 ∘C - 13.5 ∘C = 11.5 ∘C

q1 = (0.0210 kg) x (4.18 J/(g⋅∘C)) x (11.5 ∘C) = 1.09 J

The heat absorbed by X can be calculated using the equation:

q2 = m2 x ΔHfus

where m2 is the mass of X and ΔHfus is the enthalpy of fusion of X.

m2 = 1.70 g = 0.00170 kg

ΔHfus = ΔH / n = ΔH / (m2/M)

where M is the molar mass of X.

We can rearrange this equation to solve for ΔH:  ΔH = q2 x (m2/M)

With this assumption, we can calculate ΔH as follows:

ΔH = q / n = (q1 + q2) / n

ΔH  = (1.09 J + q2) / (0.00170 kg / 77.0 g/mol)

ΔH  = (1.09 J + q2) / 0.0000221 mol

The fact that the heat absorbed by X is equal to the heat emitted by the solution can be used to solve for q2:  q2 = -q1

Therefore,  ΔH = (1.09 J - q1) / 0.0000221 mol

Substituting q1, we get:

ΔH = (1.09 J - 1.09 J) / 0.0000221 mol

ΔH = 0 J/mol

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An example of solar energy being used in the U.S is in the heating of swimming pools, and powering of cabins in off grid regions.

14. Using hydrogen as a fuel source involves using it as a primary energy carrier to power vehicles or generate electricity. It can be combined with oxygen to create water, producing energy in the process. The process of using hydrogen as a fuel source is known as hydrogen fuel cell technology, which involves the conversion of chemical energy into electrical energy.

15. Hydrogen is the most abundant element in the universe but is rarely found in its pure form on Earth. It is usually found in combination with other elements such as oxygen in water, carbon in hydrocarbons, and nitrogen in ammonia. Hydrogen can be extracted from water, natural gas, coal, and biomass through various methods such as steam-methane reforming, electrolysis, and biomass gasification.

16. Advantages of using hydrogen as a fuel source include:

Disadvantages of using hydrogen as a fuel source include:

17. A fuel cell is an electrochemical device that converts chemical energy into electrical energy through a chemical reaction between hydrogen and oxygen. It consists of an anode, a cathode, and an electrolyte, with the hydrogen fuel entering the anode and the oxygen entering the cathode. The hydrogen molecules are split into protons and electrons, with the protons passing through the electrolyte and the electrons flowing through an external circuit, generating electricity. The oxygen combines with the protons and electrons at the cathode, producing water as the only byproduct.

18. Solar energy is a form of renewable energy that is derived from the sun's radiation. It is harnessed through various technologies such as photovoltaics, solar thermal systems, and concentrated solar power to generate electricity, heat water, and power homes and businesses.

19. A solar cell is a semiconductor device that converts sunlight directly into electricity through the photovoltaic effect. It is made of a thin layer of a semiconductor material such as silicon that is treated with impurities to create a p-n junction. When sunlight strikes the cell, it creates an electric field that separates the positively charged holes and negatively charged electrons, generating an electric current.

20. Advantages of using solar energy include:

Disadvantages of using solar energy include:

21. An example of solar energy being used in the U.S is in the heating of swimming pools, and powering of cabins in off grid regions.

Nucleophilic addition that targets the C=C double bond's electrophilic carbon is known as conjugate addition in,-unsaturated systems.

Changes in temperature, gas production, precipitant formation, and color are common components of chemical reactions. Cooking, digesting, and combustion are a few straightforward examples of common reactions.

When atoms' chemical bonds are established or ruptured, chemical processes take place. The materials that initiate a chemical change are known as reactants, while the materials created as a result of the reaction as known as products.

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The IUPAC name for the compound given in the question is 2,3-dibromo-5-methylheptane

The IUPAC name for compound can be obtained by using the following steps:

Thus, the IUPAC name for the compound is: 2,3-dibromo-5-methylheptane

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Answer:

1. Atoms

Explanation:

The products and reactants of a chemical reaction are usually related in terms of their atoms and molecules. During a chemical reaction, atoms are rearranged to form new molecules, and these new molecules are the products of the reaction. However, the atoms themselves are not created or destroyed in the process.

For example, if we consider the combustion of methane (CH4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), the reactants (methane and oxygen) and the products (carbon dioxide and water) are all made up of the same types of atoms (carbon, hydrogen, and oxygen), but they are rearranged in different ways. The chemical properties of the reactants and products may differ, but they are still related in terms of their atomic and molecular composition.

It's difficult though to say which is more likely between atoms and molecules because they are both essential components of chemical reactions. In a chemical reaction, atoms combine to form molecules or break apart from molecules to form new molecules. Therefore, both atoms and molecules are important in a chemical reaction.

However, if we had to choose one that is more likely to be common between the reactants and products, it would probably be atoms. This is because in most chemical reactions, the atoms involved in the reactants are rearranged to form the products. The chemical reaction simply involves the rearrangement of the atoms, but the atoms themselves are not created or destroyed

On the other hand, molecules may change significantly during a chemical reaction, as they are made up of specific arrangements of atoms. The chemical properties of the reactants and products may also differ because of changes in the molecular structure. Therefore, while molecules are still an essential part of chemical reactions, it is more likely that atoms will be common between the reactants and products.

Answer:

53.69 mg/m³

Explanation:

To calculate the concentration of ethyl acetate in milligrams per cubic meter, we need to know the total volume of the room and the amount of ethyl acetate that evaporated in grams.

The total volume of the room is:

V = l x w x h

V = 9.00 m x 6.00 m x 3.00 m

V = 162.00 cubic meters

To convert the amount of ethyl acetate evaporated from grams to milligrams, we multiply by 1000:

amount of ethyl acetate = 8.701 g = 8,701 mg

Now we can calculate the concentration of ethyl acetate in milligrams per cubic meter:

concentration = amount of ethyl acetate / volume of room

concentration = 8,701 mg / 162.00 cubic meters

concentration = 53.69 mg/m³

Therefore, the concentration of ethyl acetate in the unventilated room is 53.69 mg/m³.

H+ (aq) + OH- (aq) → H2O (l)

For each problem:

Problem 1:

Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.

We have two equations:

x + y = 200 (total mass of the solution)

0.15x + 0.20y = 0.17(200) (total amount of solute in the solution)

Solving these equations:

x = 80 g (mass of 15% solution needed)

y = 120 g (mass of 20% solution needed)

Therefore, 80 g of 15% solution and 120 g of 20% solution need to be mixed to prepare 200 g of 17% solution.

Problem 2:

Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.

We have two equations:

x + y = 300 (total mass of the solution)

0.18x + 0.05y = 0.07(300) (total amount of solute in the solution)

Solving these equations:

x = 120 g (mass of 18% solution needed)

y = 180 g (mass of 5% solution needed)

Therefore, 120 g of 18% solution and 180 g of 5% solution need to be mixed to prepare 300 g of 7% solution.

Problem 3:

Let x be the mass of the final solution.

The total amount of solute in the final solution is:

0.15(200 g) + 0.20(350 g) = 55 g + 70 g = 125 g

The total mass of the final solution is:

200 g + 350 g = 550 g

Therefore, the mass percentage of the final solution is:

(125 g / 550 g) x 100% = 22.7%

Problem 4:

Let x be the mass of the final solution.

The total amount of solute in the final solution is:

0.15(300 g) + 35 g = 80 g

The total mass of the final solution is:

300 g + 35 g = 335 g

Therefore, the mass percentage of the final solution is:

(80 g / 335 g) x 100% = 23.9%

Problem 5:

Let x be the mass of the final solution.

The total amount of solute in the final solution is:

0.25(400 g) = 100 g

The total mass of the final solution is:

400 g + 150 g = 550 g

Therefore, the mass percentage of the final solution is:

(100 g / 550 g) x 100% = 18.2%

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Answer: 3.79

Explanation: The balanced chemical equation for the reaction between formic acid (HCOOH) and KOH is:

HCOOH + KOH → HCOOK + H2O

We can use the stoichiometry of this reaction to calculate the number of moles of formic acid that reacted with the KOH:

moles of KOH = (20.00 mL)(0.500 mol/L) = 0.01000 moles

moles of HCOOH = moles of KOH

Therefore, the initial number of moles of formic acid is:

moles of HCOOH = (10.00 mL)(x mol/L) = 0.01000 moles

where x is the molarity of formic acid.

Solving for x, we get:

x = 1.00 M

Therefore, the molarity of the formic acid is 1.00 M.

At the equivalence point, all of the formic acid has reacted with the KOH, and the solution contains only the salt formed by the reaction, potassium formate (HCOOK). The pH at the equivalence point can be calculated using the equation for the salt hydrolysis constant:

Kb = Kw/Ka

where Kb is the base dissociation constant of the conjugate base (formate ion), Kw is the ion product constant for water (1.0 × 10^-14 at 25°C), and Ka is the acid dissociation constant of the acid (formic acid). Rearranging this equation, we get:

Kb/Ka = [OH^-][HCOO^-]/[HCOOH]

At the equivalence point, the concentration of the formate ion (HCOO^-) is equal to the concentration of the KOH added (0.01000 moles / 30.00 mL = 0.3333 M). We can assume that the concentration of the hydroxide ion (OH^-) is also equal to 0.3333 M, since KOH is a strong base and will dissociate completely. Substituting these values into the equation above, we get:

Kb/Ka = (0.3333)^2 / [HCOOH]

Solving for [HCOOH], we get:

[HCOOH] = (0.3333)^2 / (1.8 × 10^-4) = 6181.5 M

Taking the negative logarithm of this concentration, we get the pH at the equivalence point:

pH = -log[HCOOH] = -log(6181.5) = 3.79

Therefore, the pH at the equivalence point is 3.79.

Regenerate response

Answer:

-lithium

-atomic number

-mass number

-protons

Explanation:

There are therefore a total of 14 atoms: 2 Al, 3 C, & 9 O. In other words, 3.5 moles of calcium carbonate will contain 3.5 moles if carbon because each mole of calcium carbonate has one mole of carbon.

Hence, 40.078 divided by 100.086 everything multiplied by 100% represents the mass percentage for calcium in calcium carbonate. This yields a value of almost 40%. Carbon's mass percentage is calculated by taking 12.011 and dividing it by 100.086, then multiplying that result by 100% to get a number of roughly 12 percent.

The subscripts (2 and 3) in this formula indicate how so many atoms will make up one unit of the molecule. There are two aluminium atoms and three oxygen atoms, respectively, denoted by the numbers 2 and 3.

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Assuming that the student measured the mass of the elements using a balance and the volume using a graduated cylinder, we can use the following formula to calculate the density:

Density = mass / volume

Let's say the masses of the elements were 10.23 grams, 20.0 grams, and 21.5 grams, and the volumes were 10 mL, 20 mL, and 25 mL respectively.

Then, the densities would be:

Density of element 1 = 10.23 g / 10 mL = 1.023 g/mL

Density of element 2 = 20.0 g / 20 mL = 1.0 g/mL

Density of element 3 = 21.5 g / 25 mL = 0.86 g/mL

What is density?

Density is a physical property of matter that describes how much mass is contained in a given volume of a substance. It is defined as the amount of mass per unit volume, and is typically measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

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Answer:

The key difference between aluminum and magnesium is that the aluminum is a corrosion resistant metal whereas magnesium is not. Magnesium and aluminum are two chemical elements that we can categorize as metals in the periodic table. Both are naturally occurring metals in different mineral forms.

Explanation:

According to the kinetic molecular theory, gases are described by the following statement:

This statement highlights that gases are made up of particles that are in constant motion, moving in straight lines until they collide with another particle or the walls of the container.

The motion of gas particles is random, and their energy increases as the temperature of the gas increases. The kinetic molecular theory also suggests that the particles in a gas are far apart from each other and do not attract or repel each other, except during collisions.

Additionally, the kinetic molecular theory states that the pressure of a gas is caused by the collisions of gas particles with the walls of the container. The higher the concentration of gas particles or the faster they are moving, the greater the pressure of the gas.

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The Theory of Plate Tectonics is a scientific theory that explains how the Earth's outer shell is composed of several large plates that move and interact with each other over time.

Three observations about the Earth that provide evidence to support the Theory of Plate Tectonics are:

Earthquakes: Earthquakes occur when the movement and interaction of the tectonic plates cause rocks to fracture and shift. These seismic events are most common along the boundaries of the tectonic plates, where the movement and interaction are most pronounced. The distribution of earthquakes around the world is consistent with the theory of plate tectonics.

Volcanic Activity: Volcanic activity is closely related to the movement of tectonic plates. Many of the world's most active and well-known volcanoes are located near plate boundaries, where the movement and interaction of plates lead to the formation of magma chambers and the release of volcanic material. This relationship between volcanoes and plate boundaries supports the theory of plate tectonics.

Continental Drift: The theory of plate tectonics also explains the phenomenon of continental drift, which refers to the movement of the Earth's continents over time. According to this theory, the continents are part of the tectonic plates and have moved and shifted over millions of years. The fit of the coastlines of Africa and South America is a well-known example of continental drift and supports the theory of plate tectonics.

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The solution, which is closest to option 4, is 7.816 x 10²⁴ atoms of ions.

An atom can generate a positive charge or a negative charge depending on whether the number of electrons in the atom is greater or fewer than the number of protons in the atom. When one atom is drawn to another atom as a result of an imbalance in the numbers of its electrons and protons, it is referred to as an ION.

We must first figure out how many moles of iron there are in 363 g of iron fillings in order to answer this problem. The formula is as follows:

number of moles=mass/molar mass

The molar mass of iron (Fe) is 55.85 g/mol. Therefore:

number of moles of iron = 363 g / 55.85 g/mol = 6.499 mol

363 g of iron fillings have the following amount of iron ions in total:

total number of iron ions = 2 x number of moles of iron

= 2 x 6.499 mol

= 12.998 mol

The number of moles of iron ions can be converted to the overall amount of iron ions using Avogadro's number (6.022 x 10²³ ions/mol) as follows:

total number of iron ions

= 12.998 mol x 6.022 x 10²³ ions/mol

= 7.816 x 10²⁴ ions

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The experimental percentage of water by mass, given that the hydrate is heated and it produces 9.87 g of anhydrous, is 22.6%

First, we shall determine the mass of the water in the hydrate. Details below:

Mass of water = Mass of hydrate - Mass of anhydrous

Mass of water = 12.75 - 9.87

Mass of water = 2.88

Finally, we shall determine the experimental percentage of water by mass. Details below:

Experimental percentage of water = (mass of of water / mass of hydrate) × 100

Experimental percentage of water = (2.88 / 12.75) × 100

Experimental percentage of water = 22.6%

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The percentage by mass of hydrogen can be calculated from the problem as 2.016

To calculate the mass percent of an atom in a compound, you first need to determine the molar mass of the compound and the molar mass of the atom of interest.

Determine the molar mass of the compound by adding up the atomic masses of all the atoms in the compound.

Determine the number of moles of the atom of interest in one mole of the compound. This is done by dividing the atomic mass of the atom by the molar mass of the compound.

We know that the relative molecular mas of the compound is; 300 g/mol

Then;

Percent by mass of hydrogen is; 6/300 * 100/1

= 2.016%

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The total number of moles of reactants and products in the chemical reaction given is 9 moles

The total number of mole of reactants and products in the chemical reaction can be obtained as follow:

2H₂S + 3O₂ -> 2H₂O + 2SO₂

The following were obtained from the above equation:

Total number of mole = Mole of reactants + mole of products

Total number of mole = 5 mole + 4 moles

Total number of mole = 9 moles

Thus, we can say that the total number of mole is 9 moles

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A chemical reaction is known by;

2. Heat is released

3. A gas is given off

A change in color may indicate that a chemical reaction has occurred. For example, when iron is exposed to air and moisture, it rusts and turns from silver to reddish-brown.

If a gas is produced during a reaction, it can indicate that a chemical reaction has occurred. For example, when baking soda is mixed with vinegar, carbon dioxide gas is produced, which causes bubbles to form.

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Answer:

A. The complete balanced chemical equation, including phase labels, for the reaction is:

BaCl2 (aq) + K2O (aq) → BaO (s) + 2KCl (aq)

B. The type of reaction that has occurred is a double displacement or metathesis reaction. In this reaction, the barium cations (Ba2+) and potassium anions (K+) exchange partners, resulting in the formation of solid barium oxide (BaO) and aqueous potassium chloride (KCl).

C. The indicator that tells you a chemical reaction has occurred is the formation of a solid precipitate. In this reaction, the solid barium oxide (BaO) that forms is a clear indication that a chemical reaction has occurred. Additionally, the fact that the reactants are aqueous and the products include both a solid and an aqueous solution also indicates a chemical reaction has taken place.

To determine the number of HCl molecules in 4.91 L of HCl acid at 25°C, we can use the following steps:

[tex]\qquad\sf {Density = \dfrac{mass}{volume}}[/tex]

[tex]\qquad\sf{mass = density \times volume}[/tex]

[tex]\qquad\sf{mass = 1.096 \: g/mL \times 4.91\: L = 5.38\: kg}[/tex]

Convert the mass of HCl acid to the number of moles using its molar mass. The molar mass of HCl is 36.46 g/mol.

[tex]\sf{moles = \dfrac{mass}{ molar\: mass} = \dfrac{5.38\: kg}{36.46\: g/mol} = 147.6\: mol}[/tex]

Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules. Avogadro's number is [tex]6.02 \times 10^23[/tex] molecules/mol.

[tex]\sf number\: of\: HCl\: molecules = moles \times Avogadro's\: number[/tex]

[tex]\begin{aligned}\sf number\: of\: HCl\: molecules& =\sf 147.6 \: mol \times 6.02 \times 10^23\: molecules/mol \\& =\sf 8.88 \times 10^25\: molecules\end{aligned}[/tex]

Therefore, there are [tex]8.88 \times 10^25[/tex] HCl molecules in 4.91 L of HCl acid at 25°C, assuming the density of the acid is 1.096 g/mL.

[tex]\rule{200pt}{5pt}[/tex]

Answer: A

Explanation:

You thought i was feeling you that n was a munch

According to given Information:

The energy change of the reaction is -20kJ  is true statement, This is exothermic reaction.

Exothermic meaning that the products of the reaction have lower energy than the reactants.

The negative value of the energy change (-20kJ) indicates that energy is released during the reaction.

Energy change refers to the difference in energy between the products and reactants of a chemical reaction. If the energy change is positive, it means that energy is absorbed by the reaction and the reaction is endothermic.

If the energy change is negative, it means the energy is released by the reaction and the reaction is exothermic. The magnitude of the energy change provides information about the amount of energy that is released or absorbed during the reaction

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Answer:

To find the specific heat of the metal object, we can use the equation:

q = mcΔT

where q is the amount of heat transferred, m is the mass of the object, c is the specific heat capacity, and ΔT is the change in temperature.

We know that the metal object loses heat while the water gains heat, and the total amount of heat lost by the metal object is equal to the total amount of heat gained by the water:

qmetal = qwater

Using the equation above for each of these, we get:

mcΔT = mwatercwaterΔTwater

where cwater is the specific heat capacity of water and mwater is the mass of water.

Substituting in the given values, we get:

(20.9 g)(c)(97.0 °C - 24.1 °C) = (86.0 g)(4.184 J/g·°C)(24.1 °C - 20.5 °C)

Simplifying and solving for c, we get:

c = [(86.0 g)(4.184 J/g·°C)(24.1 °C - 20.5 °C)] / [(20.9 g)(97.0 °C - 24.1 °C)]

c = 0.385 J/g·°C

Therefore, the specific heat of the metal object is 0.385 J/g·°C.