How many calories are in 3 grams of peanuts if the following data are collected?



Mass of peanut burned = 0. 75 g


The volume of water heated = 50 mL


Temperature change = 14. 5 °C



a) 2900 cal


b) 43. 5 cal


c) 10. 88 cal


d) 725 cal

The mass of 6.9 moles of nitrous acid (HNO₂) is 324.3 grams.

To calculate the mass of 6.9 moles of nitrous acid (HNO₂), follow these steps:

1. Determine the molar mass of HNO₂.
2. Multiply the molar mass by the given moles (6.9 moles) to find the mass.

Step 1: Determine the molar mass of HNO₂.
HNO₂ consists of 1 hydrogen atom, 1 nitrogen atom, and 2 oxygen atoms.
- The atomic mass of hydrogen (H) is 1 g/mol.
- The atomic mass of nitrogen (N) is 14 g/mol.
- The atomic mass of oxygen (O) is 16 g/mol.

Molar mass of HNO₂ = (1 x 1) + (1 x 14) + (2 x 16) = 1 + 14 + 32 = 47 g/mol.

Step 2: Multiply the molar mass by the given moles (6.9 moles).
Mass of HNO₂ = 6.9 moles × 47 g/mol = 324.3 g.

So, the mass of 6.9 moles of nitrous acid (HNO₂) is 324.3 grams.

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1) The balanced reaction is [tex]2CO + O_{2} ---- > 2CO_{2}[/tex]

2) 313.6 mL is required so that 630 mL of carbon monoxide gas is completely converted to carbon dioxide.

3) 3.136 L are produced if the catalytic converter processes 6.25 L of carbon monoxide.

4) The volume of oxygen is 1.23L.

If 1  mole of CO occupies 22400 mL

x moles of CO occupies 630 mL

x = 0.028 moles

If 2 moles of CO reacts with 1 mole of oxygen

0.028 moles of CO reacts with 0.028 moles * 1/2

= 0.014 moles

Volume of oxygen required = 0.014 moles * 22400 mL

= 313.6 mL

If 1 mole of CO occupies 22.4 L

x moles of CO occupies 6.25 L

x = 0.28 moles

If 2 moles of CO produces 1 mole of carbon dioxide

0.28 moles of CO produces  0.28 * 1/2

= 0.14 moles

Volume of the carbon dioxide = 0.14 moles * 22.4 L

= 3.136 L

If 1 mole of carbon dioxide occupies 22.4 L

x moles of carbon dioxide occupies 2.5 L

x = 2.5 L * 1/22.4 L

x = 0.11 moles

If 1 mole of oxygen produces 2 moles of carbon dioxide

x moles of oxygen produces 0.11 moles of carbon dioxide

x = 0.055 moles

Volume of oxygen =  0.055 moles * 22.4 L

= 1.23L

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The concentration of arsenic in the water is 12 ppm, which is higher than the legal limit of 0.05 ppm, the sample of drinking water is not within the legal limit for arsenic. Therefore, action needs to be taken to reduce the level of arsenic in the water to make it safe for drinking.

The concentration of arsenic in the water can be calculated as follows:

Concentration (ppm) = (Mass of arsenic / Mass of water) x 1,000,000

In this case, the mass of arsenic is 0.0012 grams and the mass of water is 100 grams. Substituting these values into the formula, we get:

Concentration (ppm) = (0.0012 g / 100 g) x 1,000,000

Concentration (ppm) = 12 ppm

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The number of lead atoms in a piece of lead with a volume of 1.907 cm³ is 1.54e22 atoms.

To find this, follow these steps:
1. Calculate the mass of the lead piece using its volume and density: mass = volume x density = 1.907 cm³ x 11.34 g/cm³ = 21.61 g.
2. Determine the molar mass of lead (Pb): 207.2 g/mol.
3. Calculate the number of moles of lead in the piece: moles = mass/molar mass = 21.61 g / 207.2 g/mol = 0.104 mol.
4. Use Avogadro's number to find the number of atoms: atoms = moles x Avogadro's number = 0.104 mol x 6.022e23 atoms/mol = 1.54e22 atoms.

So, there are 1.54e22 lead atoms in the given piece of lead.

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The explanations aq and g are the ones that accurately explain the chemical equation. The appropriate choices are thus C. (so), solid

D. (l), liters

Symbols serve the following four purposes: Motivating others to take action via emotion; socially uniting groups by fostering a sense of common identity and values Clarification and revelation - show insight and clarity into the divine. Communication - conveying emotional components of an event.

The product and reactant symbols have been used to represent the chemical equation. The moles of an element that underwent a reaction are contained in the chemical equation. Prior to the compound, the moles were written as the coefficient.

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Answer:

Sedimentation equilibrium in a suspension of different particles, such as molecules, exists when the rate of transport of each material in any one direction due to sedimentation equals the rate of transport in the opposite direction due to diffusion.

The concentration of the H₂SO₄ solution Erica used was approximately 2.0 M.

To find the concentration of H₂SO₄ solution used by Erica, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between KOH and H₂SO₄:

KOH + H₂SO₄ -> K₂SO₄ + 2H2O

From the balanced equation, we can see that the mole ratio of KOH to H₂SO₄ is 1:1. This means that the number of moles of H₂SO₄ used in the reaction is equal to the number of moles of KOH. We can use this fact to calculate the number of moles of H₂SO₄ used:

moles of KOH = volume of KOH solution (in L) x concentration of KOH solution
moles of KOH = 80.0 mL x (1 L/1000 mL) x 0.70 mol/L = 0.056 mol

Since the mole ratio of KOH to H₂SO₄ is 1:1, the number of moles of H₂SO₄ used is also 0.056 mol. Now we can use the same formula as above to calculate the concentration of H₂SO₄:

concentration of H₂SO₄ = moles of H2SO4 / volume of H₂SO₄ solution (in L)
concentration of H₂SO₄ = 0.056 mol / (28.0 mL x 1 L/1000 mL) = 2.00 mol/L

Therefore, the concentration of the H₂SO₄ solution Erica used was 2.00 M.

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Answer:

Explanation:

no

Answer:

C. Ethyl dihydrogen amine

Specific heat capacity is the amount of heat required to raise the temperature of a substance by one degree Celsius per unit of mass.

To determine the specific heat capacity of 1.0g of yam, we can use a simple equation:

q = m × c × ΔT

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

To measure the specific heat capacity of yam, we would first need to heat the yam to a known temperature, and then measure the amount of heat required to raise its temperature by a certain amount.

For example, we could heat 1.0g of yam to 25°C and then place it in a known amount of water at a lower temperature, such as 20°C. We could then measure the change in temperature of the water and calculate the amount of heat required to heat the yam.

By rearranging the equation above, we can solve for c:

c = q / (m × ΔT)

We can then substitute in the values we measured and calculate the specific heat capacity of the yam. This process can be repeated several times to obtain an average value for the specific heat capacity of yam.

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The molar concentration of the solution formed when 0.55 mol of Ca(OH)₂ are dissolved in 2.20 liters of HOH is 0.25 mol/L.

To find molar concentration of a solution use the formula:

Molar concentration = moles of solute / volume of solution in liters

The moles of solute are 0.55 mol of Ca(OH)₂ and the volume of the solution is 2.20 liters of H₂O.

So, the molar concentration of the Ca(OH)₂ solution is:

Molar concentration = 0.55 mol / 2.20 L

Molar concentration ≈ 0.25 mol/L

Therefore, the molar concentration of the Ca(OH)₂ solution is 0.25 mol/L.

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Value might be different from absolute zero due to several factors like Measurement errors, External factors, Non-ideal conditions.

"Why might your value be different from absolute zero?" we need to understand the following terms:

1. Value: Refers to a quantity or numerical measurement in a specific context.
2. Absolute zero: The lowest possible temperature, at which all molecular motion stops. It is 0 Kelvin (K) or -273.15 degrees Celsius (°C) or -459.67 degrees Fahrenheit (°F).

Your value might be different from absolute zero due to several factors, such as:
1. Measurement errors: If you are measuring a temperature, there could be inaccuracies in your measuring device, leading to a value different from absolute zero.
2. External factors: The presence of heat or energy in your system can cause the value to deviate from absolute zero.
3. Non-ideal conditions: In real-world situations, reaching absolute zero is practically impossible due to quantum effects and other factors, causing your value to be higher than absolute zero.

By understanding these factors, you can identify why your value may differ from absolute zero.

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ans.1

blank 1 = 4

blank 2 = 4

blank 3 = 1

blank 4 = 8

ans.2

blank 1 = 10

blank 2 = 15

blank 3 = 1

blank 4 = 30

ans.3

blank 1 =  1

blank 2 = 2

blank 3 = 2

blank 4 = 1

blank 5 =2

The solubility is the amount of a substance that dissolves in a given quantity of solvent at a particular temperature to produce a saturated solution.

Definition: Solubility is defined as the maximum amount of solute that can dissolve in a given quantity of solvent at a specific temperature and pressure to form a saturated solution. It is typically expressed in terms of the mass of solute per unit volume or mass of solvent.

Solute and Solvent: In a solution, the solute is the substance that is being dissolved, while the solvent is the medium in which the solute dissolves. The solute can be a solid, liquid, or gas, while the solvent is usually a liquid, but can also be a gas or a solid in some cases.

Saturated Solution: A saturated solution is a solution in which the maximum amount of solute has been dissolved in a given quantity of solvent at a specific temperature. In a saturated solution, the rate of dissolution of the solute is balanced by the rate of precipitation or crystallization of the solute, resulting in a dynamic equilibrium.

Factors Affecting Solubility: The solubility of a solute depends on several factors, including temperature, pressure, and the nature of the solute and solvent.

Generally, increasing temperature enhances solubility for most solid solutes, while the effect of pressure on solubility is more significant for gases dissolved in liquids. The polarity and intermolecular forces between the solute and solvent molecules also influence solubility.

Solubility Curves: Solubility can be represented graphically by constructing solubility curves. These curves depict the relationship between the solute's solubility and the temperature or pressure.

Solubility curves can help determine the maximum amount of solute that can dissolve under different conditions and can vary for different solutes and solvents.

Supersaturation: Under certain conditions, it is possible to create a supersaturated solution, where the solute concentration exceeds the solubility limit at a given temperature.

Supersaturated solutions are unstable and can result in the precipitation of excess solute upon the introduction of a seed crystal or disturbance.

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a. The anode is where oxidation occurs, so the half reaction taking place at the anode is: O₂(g) + 4 H⁺(aq) + 4 e⁻→ 2 H₂O(l)

b. The cathode is where reduction occurs, so the half reaction taking place at the cathode is: 2 H⁺(aq) + 2 e⁻+ 2 H₂S(g) → 2 S(s) + 2 H₂O(l)

c. To calculate the standard cell potential, Eocell, we need to add the reduction potential of the cathode and the oxidation potential of the anode. The reduction potential of the cathode half reaction is +0.15 V, and the oxidation potential of the anode half reaction is -1.23 V. Therefore, Eocell = +0.15 V + (-1.23 V) = -1.08 V.

d. To produce the voltage of -1.08 V, the reaction must be spontaneous, which means that the Gibbs free energy change, ΔG, must be negative.

The relationship between ΔG, Eocell, and the equilibrium constant, K, is: ΔG = -nFEocell = -RTlnK, where n is the number of electrons transferred, F is Faraday's constant, R is the gas constant, and T is the temperature.

Solving for K, we get: K = e^(-ΔG/RT) = e^(-nFEocell/RT).

Substituting the values, we get: K = e^(-(-2)(96485 C/mol)(-1.08 V)/(8.314 J/mol-K)(298 K)) = 4.5 x 10¹⁸. Since the reaction is in acid, the partial pressure of H⁺ is 1 atm.

Using the equilibrium constant expression for the reaction, K = [S]²/[H₂S]², we can solve for the partial pressure of H₂S: P(H₂S) = [S]/√K. Substituting the values, we get: P(H₂S) = (1 atm)/√(4.5 x 10¹⁸) = 6.7 x 10⁻¹⁰atm.

Therefore, the partial pressure of H₂S must be 6.7 x 10⁻¹⁰ atm, and the partial pressure of O₂ must be 1 atm, to produce the voltage in part c.

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Answer:

0.108L HCl

Explanation:

5.32 g zinc * 1 mol zinc/65.38g zinc * 2 mol HCl/1 mol zinc * L HCl/1.5 mol HCl = 0.108L HCl

The retentate flow rate is 5,021.862 kg/h and the permeate flow rate is 5,021.862 kg/h. The membrane surface area required is 3,517.948 m².

Permeate flow is the rate at which a fluid passes through a membrane. It is a measure of the membrane's permeability, which is the ability of a substance to pass through a membrane. Permeate flow is used in many industrial processes, such as purification of fluids, separation of compounds, and concentration of liquids.

The first step is to calculate the mass flow rate of the feed. This is given by the equation:

Mass flow rate (kg/h) = Feed flow rate (kg/h) x Feed concentration (wt%)

Mass flow rate = 9,905 kg/h x 57.5 wt% = 5,686.625 kg/h

Next, we need to calculate the flow rate of the retentate and permeate in kg/h. This is given by the equation:

Flow rate (kg/h) = Mass flow rate (kg/h) x Retentate/Permeate concentration (wt%)

Retentate flow rate = 5,686.625 kg/h x 16.4 wt% = 931.939 kg/h

Permeate flow rate = 5,686.625 kg/h x 88.2 wt% = 5,021.862 kg/h

Finally, we need to calculate the membrane surface area in m². This is given by the equation:

Membrane surface area (m²) = Permeate flow rate (kg/h) / Total permeate mass flux (kg/m²-h)

Membrane surface area = 5,021.862 kg/h / 1.43 kg/m²-h = 3,517.948 m².

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The boiling point of the solution is 80.58 °C, which is prepared by dissolving 2. 50 g of biphenyl (C₁₂ H₁₀).

To determine the boiling point of the solution, we need to use the equation;

Δ[tex]T_b}[/tex] = [tex]K_{b}[/tex] x m

Where ΔTb is boiling point elevation, is molal boiling point elevation constant, and m is molality of the solution.

First, we to calculate the molality of the solution;

moles of biphenyl =2.50 g / 154 g/mol

= 0.0162 mol

mass of benzene = 85.0 g

moles of benzene = 85.0 g / 78.11 g/mol

= 1.088 mol

molality = moles of solute/mass of solvent (in kg)

molality = 0.0162 mol / 0.085 kg

= 0.19 mol/kg

Next, we need to look up the molal boiling point elevation constant ([tex]K_{b}[/tex]) for benzene. The value of [tex]K_{b}[/tex] for benzene is 2.53 °C/m.

Finally, we alculate the boiling point elevation;

Δ[tex]T_b}[/tex] = [tex]K_{b}[/tex] x m

Δ[tex]T_b}[/tex] = 2.53 °C/m x 0.19 mol/kg

= 0.481 °C

The boiling point elevation (Δ[tex]T_b}[/tex]) is the difference between the boiling point of the solution and the boiling point of the pure solvent. The boiling point of pure benzene is 80.1 °C. Therefore, the boiling point of the solution will be;

Boiling point of solution = 80.1 °C + 0.481 °C

= 80.58 °C

So, the boiling point of the solution is 80.58 °C.

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The concentration of [tex]Ca(OH)_2[/tex] is 0.0217 M.

The balanced chemical equation for the reaction between the  [tex]Ca(OH)_2[/tex] and the HCl is:

[tex]Ca(OH)_2 + 2HCl[/tex] → [tex]CaCl_2 + 2H_2O[/tex]

From this equation, we can see that 1 mole of [tex]Ca(OH)_2[/tex] reacts with 2 moles of HCl.

The number of moles of HCl used can be calculated as:

moles HCl = Molarity * Volume in liters[tex]= 0.029 M\ *\ 0.0373 L = 0.0010837\ mol[/tex]

Since the stoichiometry of the reaction is 1:2 between [tex]Ca(OH)_2[/tex] and HCl, the number of moles of [tex]Ca(OH)_2[/tex] in the 25.0 mL sample can be calculated as:[tex]moles\ Ca(OH)2 = 0.0010837\ mol / 2 = 0.00054185\ mol[/tex]

The concentration of [tex]Ca(OH)_2[/tex] can then be calculated as:

[tex]Molarity = moles[/tex] ÷ [tex]Volume\ in\ liters\ = 0.00054185\ mol[/tex] ÷ 0.025 L = 0.0217M

Therefore, the concentration of [tex]Ca(OH)_2[/tex] is 0.0217 M.

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To prepare a hydroponic solution with 35 mg/L of phosphorus in a 500 mL volume, you will need to dilute the concentrated calcium dihydrogen phosphate solution.

Firstly, calculate the volume of the concentrated solution required to make the desired concentration. You can apply the formula here:

C1V1 = C2V2

Where C1 is the concentration of the concentrated solution (200 mg/L), V1 is the volume of concentrated solution required, C2 is the desired concentration (35 mg/L), and V2 is the final volume of the solution (500 mL).

Substituting these values, we get:

(200 mg/L) V1 = (35 mg/L) (500 mL)

V1 = (35 mg/L) (500 mL) / (200 mg/L)

V1 = 87.5 mL

So, you need 87.5 mL of the concentrated solution to make 500 mL of the final solution with a phosphorus concentration of 35 mg/L.

To prepare the final solution, measure 87.5 mL of the concentrated solution and add it to a measuring cylinder. Add distilled water to make the remaining 500 mL, and then. Mix the solution well to ensure that the calcium dihydrogen phosphate is evenly distributed.

This will give you a hydroponic solution with a phosphorus concentration of 35 mg/L, which falls within the common range of elemental phosphorus required for growing lettuce.

What is hydroponic solution?

A Hydroponic solution, also known as hydroponic nutrient solution, is a specially formulated liquid mixture of nutrients that is used to grow plants hydroponically. Hydroponics is a method of growing plants in a soil-free medium, where the roots of the plants are suspended in a nutrient-rich solution.

The first two carboxylic acids described contain a benzene ring, which is not susceptible to the malonic ester synthesis.

The malonic ester synthesis requires a compound with a methyl group adjacent to both carboxylate groups, and a benzene ring does not fulfill this requirement. The last two carboxylic acids described cannot be prepared by the malonic ester synthesis because an SN₂ reaction cannot be performed on compounds with bulky substituents or with two or more halogen atoms attached to the same carbon atom.

The synthesis requires the use of an alkyl halide that can undergo an SN₂ reaction with sodium ethoxide, but benzyl bromide, bromobenzene, and dibromobenzene are not suitable for this type of reaction. Additionally, the bromide required for the synthesis is unstable, which further complicates the reaction.

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The pressure in the each of the units of the pressure is a s:

atm = 0.91

psi = 13.5

kpa = 93.12

The barometric pressure = 698.5 mmHg

The conversion of pressure unit from mmHg to atm :

1 mmHg = 0.00131579 atm

698.5 mmHg = 0.91 atm

The 698.5 mmHg is expressed as 0.91 atm.

The conversion of pressure unit from mmHg to psi :

1 mmHg = 0.0193368 psi

698.5 mmHg = 13.5 psi

The 698.5 mmHg is expressed as 13.5 psi.

The conversion of pressure unit from mmHg to kpa :

1 mmHg = 0.133322 kpa

698.5 mmHg = 93.12 kpa

The 698.5 mmHg is expressed as 93.12 kpa.

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To convert mmHg to atm, divide the mmHg value by 760. To convert mmHg to psi, divide the mmHg value by 51.714. Therefore, 698.5 mmHg is equal to 0.924 atm, 13.37 psi and 93.5 kPa.

Equality is the state of having the same rights, status, and opportunities regardless of gender, race, religion, or other characteristics. It means that all people are treated without prejudice or discrimination and that everyone can access the same resources, services, and opportunities. Equality is essential to the functioning of a fair and just society, and it is one of the core values of many countries. It is also essential to achieving social and economic progress. Equality is a fundamental human right, and it is essential to creating a sense of inclusion and belonging in a society.

Atm: 0.924 atm

Psi: 13.37 psi

Kpa: 93.5 kPa

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Ketone 1 undergoes different reactions depending on the base used.

When treated with potassium tert-butoxide at room temperature, it produces ketone 2 via an intramolecular aldol reaction.

On the other hand, when treated with LDA at low temperatures, it undergoes a kinetic enolate formation followed by intramolecular cyclization to give an intermediate, which upon heating, eliminates lithium and produces ketone 3. The reaction conditions favor each product due to the different reactivity of the bases.

Potassium tert-butoxide is a strong base and promotes a fast aldol reaction at room temperature, while LDA is a weaker base that requires low temperatures to form the kinetically favored enolate intermediate, which upon heating, undergoes lithium elimination to give ketone 3.

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The  statements correctly describe protecting groups are :

"A reactive functional group converted to another functional group and it will not interfere desired reaction."

"The Protecting group easily removed (deprotection) to the regenerate original functional group."

The protecting group are the molecular formula that will be introduced  the specific functional group and which is present in the poly-functional molecule and the protecting group block the reactivity under the some reaction conditions and which is needed to make the modifications in molecule.

The protecting group readily and the protecting group is selectively introduced to functional group in poly-functional molecule. Protecting group is capable of the selectively removed in under some of the mild conditions when protection is no more longer required.

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To calculate the mass of mercury(I) chloride that the chemist has added to the reaction flask, we need to know the molar mass of the compound and the number of moles of the solution added.

The molar mass of mercury(I) chloride is 232.6 g/mol. The chemist added an unspecified volume of the solution, so we cannot directly calculate the number of moles added. However, we can use the concentration of the solution, which is typically given in units of moles per liter (mol/L).

Let's assume that the concentration of the mercury(I) chloride solution is 0.1 mol/L. This means that there are 0.1 moles of mercury(I) chloride in every liter of the solution. We don't know how much of the solution the chemist added, but we can use a conversion factor to calculate the number of moles based on the volume.

For example, if the chemist added 10 mL of the solution, we can convert that to liters by dividing by 1000 (1 mL = 0.001 L).
10 mL x (0.001 L/1 mL) = 0.01 L
Now we can use the concentration to calculate the number of moles:

0.1 mol/L x 0.01 L = 0.001 mol
Finally, we can use the molar mass to convert from moles to grams:
0.001 mol x 232.6 g/mol = 0.2326 g

To convert to micrograms, we need to multiply by 1,000,000:
0.2326 g x 1,000,000 µg/g = 232,600 µg
Therefore, the mass of mercury(I) chloride added to the reaction flask is 232,600 µg, rounded to significant digits.

It's worth noting that the exact answer will depend on the actual concentration of the solution and the volume added, but this calculation provides a general approach to solving this type of problem.

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The order of the atoms from most positive overall charge to least positive overall charge is:  Atom B > Atom R > Atom A > Atom P.

What is the order of atoms?

To determine the order of the atoms from most positive overall charge to least positive overall charge, we need to compare the number of protons (positive charges) and electrons (negative charges) for each atom.

Atom R has 26 protons and 24 electrons. Therefore, it has a net positive charge of 2+.

Atom B has 24 protons and 19 electrons. Therefore, it has a net positive charge of 5+.

Atom A has 14 protons and 16 electrons. Therefore, it has a net negative charge of 2-.

Atom P has 8 protons and 11 electrons. Therefore, it has a net negative charge of 3-.

Therefore, the order of the atoms from most positive overall charge to least positive overall charge is:

Atom B > Atom R > Atom A > Atom P.

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The standard cell potential (∆°cell) can be calculated using the formula:

∆°cell = ∆°reduction (reduced) - ∆°oxidation (oxidized)

where ∆°reduction and ∆°oxidation are the standard reduction potentials of the reduction and oxidation half-reactions, respectively.

The oxidation half-reaction is:

Ni2+(aq) + 2e- → Ni(s) ∆°oxidation = - 0.26 V

The reduction half-reaction is:

Mg2+(aq) + 2e- → Mg(s) ∆°reduction = - 2.37 V

Therefore, the standard cell potential is:

∆°cell = ∆°reduction - ∆°oxidation

∆°cell = (-2.37 V) - (-0.26 V)

∆°cell = -2.11 V

The equilibrium constant (K) can be calculated from the standard cell potential using the Nernst equation:

∆°cell = -(RT/nF) ln K

where R is the gas constant (8.314 J/(mol·K)), T is the temperature in Kelvin (298 K), n is the number of electrons transferred in the balanced equation (2), and F is the Faraday constant (96,485 C/mol).

Substituting the values and solving for K, we get:

K = exp(-(∆°cell)/(RT/nF))

K = exp(-((-2.11 V)*(96,485 C/mol)/(8.314 J/(mol·K)298 K2)))

K = 1.1 × 10^12

Therefore, the equilibrium constant for the reaction is 1.1 × 10^12.

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The substance that will cool the fastest when equal masses are heated to the same temperature is the one with the lowest specific heat.

This is because a substance with a lower specific heat requires less energy to raise its temperature by a certain amount, and therefore it will release heat more quickly when it cools down.

Out of the given substances, substance A has the lowest specific heat of 0.90 J/g-°C, so it will cool the fastest when equal masses are heated to the same temperature.

Substance B has a specific heat of 1.70 J/g-°C, substance C has a specific heat of 2.70 J/g-°C, and substance D has the highest specific heat of 4.18 J/g-°C.

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