What is the physical property of gravity?

The initial concentration of the monoprotic weak acid solution (pka = 4.2) ` has a pH value of 3.4 is : 0.0025 M.

The pH value = 3.4

The pka value = 4.2

The monoprotic acid is given as follows :

HA   ---->   H⁺  +  A⁻

The pH expression is given as :w

pH = 1/ 2 [ pka - loga]

where,

pka = 4.2

pH = 3.4

3.4 = 1/2 [ 4.2 - loga]

6.8 = 4.2 - log a
2.6 = - log a

a =  10^-2.6

a = 0.0025 M

The initial concentration of a monotropic acid is 0.0025 M.

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Ionization energy is a function of atomic radius; the larger the radius, the smaller the amount of energy required to remove the electron from the outermost orbital.

As shielding increases going over the PT, atomic radii will increase because the shielding effect is acquired stronger which causes the valence electrons to be less attracted to the nucleus, as the atomic radii increases, ionization energy will decrease because it will not grip as much energy to remove valence.

Ionization energy and atomic number. active from left to right across the periodic table, the ionization energy for an atom increases. We can explain this by the whole nuclear charge of the atom. The more protons in the nucleus, the stronger the appeal of the nucleus to electrons.

So we can conclude that The smaller the radius, the higher the ionization energy. This is because the electrons are being held closer to the protons,

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The net chemical equation for the production of acrylic acid from calcium carbide, water and carbon dioxide is 6C₂H₂(g) + 16H₂O(g) + 3CO₂(g) ⇒ 6Ca(OH)₂(s) +  5CH₂CHCO₂H(g)

You must write out the two chemical equations and then add the elements or compounds on either side to obtain the net chemical equation. then eliminate the ones on each side.

Following is the first step of the reaction, which involves the reaction of calcium carbide with water to produce acetylene and calcium hydroxide:

6CaC₂(s) + 12H₂O(g) ⇒ 6C₂H₂(g) + 6Ca(OH)₂(s)

Acetylene, carbon dioxide, and water combine to generate acrylic acid in the second phase, which goes like this:

6C₂H₂(g) + 4H₂O(g) + 3CO₂(g) ⇒ 5CH₂CHCO₂H(g)

The overall reaction equation will be;

6C₂H₂(g) + 16H₂O(g) + 3CO₂(g) ⇒ 6Ca(OH)₂(s) +  5CH₂CHCO₂H(g) is the net chemical equation.

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The best answer from the list of statements is: The student noticed that the rate at which oxygen gas collected was noticeably slower after the reaction had been running for several minutes than it was when the reaction was first started.

A chemical reaction is a process in which atoms or molecules interact to form new substances with different chemical properties. During a chemical reaction, bonds between atoms are broken and new bonds are formed to create different molecules. Chemical reactions involve the rearrangement of atoms to form new compounds and release energy in the form of heat, light, or sound. Chemical reactions usually involve the exchange of electrons between atoms, resulting in the formation of new compounds. Chemical reactions are also affected by external factors such as temperature, pressure, and the presence of a catalyst.

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When the 4.53 mol P will reacts with the 18.63 mol F₂, The number of the moles of the PF₅ is 4.53 mol.

The balanced chemical equation is as follows :

2P + 5F₂    →    2PF₅

The number of the moles = mass / molar mass

The moles of the P = 4.53 mol

The moles of the F₂ = 18.63 mol

It is clear from the balanced chemical equation is as :

1 mole of P  produce 2 mole of PF₅

The moles of the PF₅ = (2/2 ) × 4.53 mol

The moles of the PF₅ = 4.53 mol= (2/2 ) × 4.53 mol

The moles of the PF₅ = 4.53 mol

Thus, the mole of PF₅ = 4.35 mol

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Since water is amphoteric, it can function as both a Brnsted-Lowry acid and a base. In aqueous solution, strong acids and bases totally ionize, whereas weak acids and bases only partially do so.

The acid-base theory of Bronsted-Lowry. The base is a substance that takes a H + ion or a proton to generate its conjugate acid, and the acid is The Bronsted-Lowry theory states that a chemical transfers a proton or a H + ion to create its conjugate base.

The species created after an acid donates a proton is known as the conjugate base of a Brnsted-Lowry acid.

Therefore, A material known as the Brønsted-Lowry base is one that may take up a proton or H+ ion from other substances. A base reforms when a conjugated acid donates a proton.

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Since water is amphoteric, it can function as both a Brnsted-Lowry acid and a base. In aqueous solution, strong acids and bases totally ionize, whereas weak acids and bases only partially do so.

The acid-base theory of Bronsted-Lowry. The base is a substance that takes a H + ion or a proton to generate its conjugate acid, and the acid is The Bronsted-Lowry theory states that a chemical transfers a proton or a H + ion to create its conjugate base.

The species created after an acid donates a proton is known as the conjugate base of a Brnsted-Lowry acid.

Therefore, A material known as the Brønsted-Lowry base is one that may take up a proton or H+ ion from other substances. A base reforms when a conjugated acid donates a proton.

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Among the given options of the question option e. Nylon 6,6 is a copolymer.

Nylon 6,6 is a copolymer made from two monomers, hexamethylene diamine and adipic acid. It is a thermoplastic polymer with a high strength-to-weight ratio and excellent durability, making it suitable for a variety of applications including fibers for clothing, machinery parts, and automotive applications. Nylon 6,6 is also resistant to abrasion, solvents, and UV light, which adds to its versatility in different environments and conditions.

Copolymers are polymers formed from two or more different monomers. They have properties that are a combination of the properties of the individual monomers. Copolymers have a wide range of applications, including in the fields of materials science, medicine, and the environment.

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Let's call the volume of the 50% alcohol mixture used x and the volume of the 85% alcohol mixture used y. We know that the total volume of the solution must be 455 ml, so:

x + y = 455 ml

To find the amount of alcohol in each mixture, we need to multiply the volume of each mixture by its concentration.

For the 50% alcohol mixture:

0.50 * x = 0.80 * (x + y) * 0.5 -------(1)

And for the 85% alcohol mixture:

0.85 * y = 0.80 * (x + y) * 0.55 -----(2)

We can substitute the second (2) into the (1):

0.50 * x = 0.80 * (x + y) * 0.5

0.50 * x = 0.80 * (x + y) * 0.5

0.50 * x = 0.44 * (x + y)

Finally, we can solve for x and y by dividing both sides of the equation by 0.44:

x = (0.50 * x) / 0.44

x = (0.50 * x) / 0.44

x = 227.27 ml

And then, we can find y by using the  equation (1):

y = 455 ml - x

y = 455 ml - 227.27 ml

y = 227.73 ml

So, we need 227.27 ml of the 50% alcohol mixture and 227.73 ml of the 85% alcohol mixture to obtain the desired 80% alcohol solution.

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The percent by mass of water in BaCl2.5H2O is approximately43.22%.

Mass of the element or solute divided by the mass of the compound or solute is called mass percent . The result is then multiplied by 100 to give a percent.

To calculate the percent by mass of water, you would need to find the mass of water in the formula and divide it by the total mass of the formula and multiply by 100.

BaCl2.5H2O formula weight = 208.23 g/mol

Mass of water (5 x 18.02 g/mol) = 90.1 g

Percent by mass of water = (90.1 g / 208.23 g) x 100 = 43.22%.

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When 3,3-dimethylbut-1-ene is treated with HBr alone, the major product is 2-bromo-2,3-dimethylbutane :

H₃C = CH - C(CH₃)₂ - CH₃ + HBr  ----->  H₃C - C(CH₃) - CH(CH₃) - CH₃

                                                                          |

                                                                         Br

The reaction in which addition of HBr to the 3,3-dimethylbut-1-ene will takes place according to the markonikov rule.

H₃C = CH - C(CH₃)₂ - CH₃ + HBr  ----->  H₃C - C(CH₃) - CH(CH₃) - CH₃

                                                                          |

                                                                         Br

                                                                         2-bromo-2,3-dimethylbutane

When the same in addition of the HBr in the presence of the peroxide will form thew product  1-bromo-3,3-dimethylbutane.

H₃C = C(CH₃) - C(CH₃)₂ - CH₃   ------ >   H₂C - CH₂ - C(CH₃)₂ - CH₃

                                                                     |

                                                                     Br

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The new volume is 500. ml.

The relationship between pressure, volume and temperature for a gas at a constant number of moles is given by the Ideal Gas Law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature in Kelvin.

Since the number of moles is constant, we can rearrange the Ideal Gas Law to isolate the volume:

V = nRT / P

Plugging in the known values:

V = nRT / P

V = nRT / 2.00 atm

V = (nRT) / (2.00 atm)

V = 250. ml * 2.00 atm / 1.00 atm

The new volume is 500. ml.

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There are 7.40 x 1025 grams of AgNO3 in 7.40 x 1023 molecules of AgNO3.

1 mole of AgNO3 = 169.87 g

Therefore, the total mass of AgNO3 = 7.40 x 1023 x 169.87 g

= 1.25 x 1026 g

What is molecules?

Molecules are the smallest unit of a chemical compound which is composed of two or more atoms of the same or different elements. Molecules can exist in different forms such as solid, liquid, or gas. They are the building blocks of all matter and are responsible for the physical and chemical properties of substances. Molecules also play an important role in biological processes.

Therefore, There are 7.40 x 1025 grams of AgNO3 in 7.40 x 1023 molecules of AgNO3.

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Answer:

Jet streams form when warm air masses meet cold air masses in the atmosphere. The Sun doesn't heat the whole Earth evenly. That's why areas near the equator are hot and areas near the poles are cold

The following are the ions:

As2O3 - As^3+, O^2-

MnS - Mn^2+, S^2-

VCl3 - V^3+, Cl^-

NiF2 - Ni^2+, F^-

What exactly are cation and anion?

An anion is a negative ion, whereas cations are positive ions. Cations and anions make up ionic substances.

Below is a list of the anions and cations found in the ionic compounds in the table;

As2O3 - As^3+, O^2-

MnS - Mn^2+, S^2-

VCl3 - V^3+, Cl^-

NiF2 - Ni^2+, F^-

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The concentration of sulfuryl chloride after 4.5 hours.  The reaction is first order . The concentration ,[SO₂Cl₂] = 0.017 M.

The chemical reaction is as follows :

SO₂Cl₂(g)  ---->  SO₂(g)  + Cl₂(g)

Rate = k [SO₂Cl₂]

k = 2.2  × 10⁻⁵ s⁻¹

The integrated law is as follows :

[SO₂Cl₂] = [SO₂Cl₂] e^-kt

The initial concentration  = 0.0248 M

The reaction time is 4.5 hours. the molarity after the time 4.5 hours is :

[SO₂Cl₂]  = ( 0.0248 M) e ^(2.2  × 10⁻⁵ s⁻¹ × 16200 s)

[SO₂Cl₂]  = 0.017 M

Thus, the concentration after the time 4.5 hours is 0.017 M.

This question is incomplete, the complete question is :

Sulfuryl chloride decomposes when heated.

SO₂Cl₂(g)  ---->  SO₂(g)  + Cl₂(g)

In an experiment, the initial concentration of sulfuryl chloride was 0.0248 mol/L. If the rate constant is 2.2 × 10⁻⁵ s⁻¹, what is the concentration of sulfuryl chloride after 4.5 hours? The reaction is first order.

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To get rid of any impurities and inhibitors of polymerization.

The petroleum products that are used to generate these items are the main source of Styrene after fractional distillation to remove the olefins and aromatics necessary for the chemical components to produce Styrene, which is a translucent organic liquid hydrocarbon. Styrene, likewise referred to as High Impact Expandable plastic polystyrene is a cheap, lightweight, and convenient material to transport. Plastics, polyesters, latex paints and coatings, synthetic rubber, and styrene-alkyd coatings are the main applications for styrene. These materials have several uses in the construction, packaging, automotive, and home goods industries.High levels of styrene in the air can disrupt your ability to see colour, make you feel fatigued or inebriated, slow down your reaction time, make you lose focus, and affect your balance. Extremely high styrene concentrations resulted in animals exhibiting hearing loss. Workers who are exposed to styrene risk health problems. Prior to usage, styrene was purified using extractions with a 5 weight percent aqueous solution of sodium hydroxide (NaOH) to get rid of any impurities and polymerization inhibitors, and then with distilled water to get rid of any NaOH that was still present. Drying with anhydrous Na2SO4 was then done.

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Sodium hydroxide (NaOH) is used to extract styrene from aqueous solutions because it acts as a base, which reacts with the acidic styrene molecules to form sodium styrenate, which is soluble in water. This allows for the styrene to be easily separated and removed from the solution.

The petroleum products that are used to generate these items are the main source of Styrene after fractional distillation to remove the olefins and aromatics necessary for the chemical components to produce Styrene, which is a translucent organic liquid hydrocarbon. Styrene, likewise referred to as High Impact Expandable plastic polystyrene is a cheap, lightweight, and convenient material to transport. Plastics, polyesters, latex paints and coatings, synthetic rubber, and styrene-alkyd coatings are the main applications for styrene.

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The family of compounds known as isonitriles, or cyanamides, is distinguished by the presence of a nitrogen atom bound to a carbon atom and a cyano group (-CN) on the nitrogen.

They contain the chemical formula R-NC and are regarded as a significant class of compounds because of their distinctive characteristics and diverse range of uses. Isonitriles are helpful in the synthesis of several chemicals because of their great thermal stability, low reactivity, and insoluble nature in the majority of solvents. Additionally, they serve as ligands in coordination chemistry and as intermediates in the production of organic compounds. Isonitriles are employed in the production of several medications, therefore they have a significant impact on the pharmaceutical sector as well. Due to their distinct characteristics and wide range of uses in industries including chemistry, pharmacology, and materials research, isonitriles are a significant family of substances.

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Fermi doublets becomes  difficult to identify when one peak overlaps with sp3 C-H peaks or sp2 C-H peaks.

Fermi resonance appears when a fundamental vibration frequency lies closely to an overtone or combination frequencies.

We know that in NMR spectroscopy, Fermi doublets arise from coupling between a nucleus and its neighboring nuclei, and they appear as two closely spaced peaks in the spectrum.

But in most cases, if the peaks are small, they may not be easily differentiated most especially when they overlap with peaks from other nuclei, such as sp3 C-H or sp2 C-H peaks making  it difficult to accurately identify and interpret the Fermi doublet in the NMR spectrum.

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Answer:

The name for CCl3 is carbon tetrachloride.

he mass of 3.0 x 10²³ molecules of nitrogen gas is 13.95 g. It can be calculated by using molecules formula.

Mass of the Nitrogen gas

The mass of one mole of Nitrogen gas is 28 g/mol.

Number of atoms

The number of atoms in one mole of Nitrogen gas is 6.022 x 10²³ molecules.

The mass of Nitrogen gas in the given number of molecules is calculated as follows;

6.022 x 10²³  =  28 g/mol

3.0 x 10²³ =  x

x= ....?

3.0 . 10²³ . 28 = 6.022 x 10²³  . x

x = [tex]\frac{3.0 . 10^{23} . 28}{6.022 . 10^{23} }[/tex]

x = 13.95

Thus, the mass of 3.0 x 10²³ molecules of nitrogen gas is 13.95 g.

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The molarity of the potassium hydroxide solution is 0.25 mol/L.

Molarity is a measure of concentration that expresses the amount of solute (the substance being dissolved) in a solution in terms of moles. It is defined as the number of moles of solute per liter of solution. Mathematically, molarity is represented as follows:

M = n/V

where,

n = number of moles of solute

V = volume of the solution in liters

To find the molarity of the potassium hydroxide solution, we need to calculate the number of moles of KOH present in the solution and divide that by the volume of the solution.

First, we'll find the number of moles of KOH:

moles = mass / molar mass

moles = 42.1 g / 56.1 g/mol

moles = 0.75 mol

Next, we'll convert the volume of the solution from liters to liters:

Volume = 3.0 L

Finally, we'll divide the number of moles of KOH by the volume of the solution to find the molarity:

Molarity = moles/volume

Molarity = 0.75 mol / 3.0 L

Molarity = 0.25 mol/L

Therefore, the molarity of the potassium hydroxide solution is 0.25 mol/L.

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The Carbon dioxide molecule is non-polar because the dipole antennas in the linear form of the molecule cancelled each other out.

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can be drawn to or repelled by one another .

In the field of chemistry, a molecule is defined as being polar if it contains an unbalanced charge on one of its sides. There is a half charge area there. Both ends have a small positive and negative tilt. With an unequal distribution of electrons, they are typically asymmetrical.

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The Carbon dioxide molecule is non-polar because the dipole antennas in the linear form of the molecule cancelled each other out.

How do polar and nonpolar differ?

We refer to something as polar when it has two distinct ends. When a molecule has both positive and negative ends, we refer to it as being polar. We refer to someone as non-polar if they don't. Polar objects can be drawn to or repelled by one another .

Exactly what is polar?

In the field of chemistry, a molecule is defined as being polar if it contains an unbalanced charge on one of its sides. There is a half charge area there. Both ends have a small positive and negative tilt. With an unequal distribution of electrons, they are typically asymmetrical.

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The ratio of the equilibrium concentrations of the products to the concentrations of the reactants raised to their respective powers to the coefficients in the equilibrium equation is K in law of mass action.

To use a typical chemical reaction equation in which reactants A and B react to yield products C and D, we introduce the mass action law. The chemical species' concentrations are denoted by the square brackets "[]" around them. This is the ideal law of mass action or chemical equilibrium.

The Law of Mass Action states that when a chemical reaction reaches the optimum, the concentrations of the chemicals involved bear a constant relation to each other, which is explained by an equilibrium constant, and that the speed of a reaction varies depending on the molecular concentrations of the reactants.

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Calculating the vector sum of the electric fields generated by distinct point charges allows one to determine the strength of the electric field at a specific location in space.

The force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them, according to Coulomb's Law, which can be utilised to accomplish this. The total electric field at qa can be computed using Coulomb's Law by first calculating the electric field at qa caused by qb and qc, and then adding those fields vectorially.

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The pH of a 0.037 M solution of methylamine is 4.97.

The Kb value and the amount of methylamine present in the solution can be used to calculate the pH of a methylamine solution. As a weak base, methylamine interacts with water to produce the ions methylammonium (CH3NH3+) and hydroxide (OH) (OH-). The concentration of the hydroxide ion in solution can be determined using the equilibrium constant for this reaction, Kb:

Kb = [CH3NH3+] × [OH-] / [CH3NH2]

Since the concentration of methylamine is known, the concentration of the hydroxide ion can be calculated:

Kb = [OH-[tex]]^{2}[/tex] / [CH3NH2]

[OH-] = sqrt(Kb × [CH3NH2]) = sqrt(4.38 x [tex]10^{-4}[/tex] × 0.037) = 1.07 x [tex]10^{-5}[/tex] M

The pH of the solution can be calculated using the concentration of the hydroxide ion:

pH = -log([OH-]) = -log(1.07 x [tex]10^{-5}[/tex]) = 4.97

So, the pH of a 0.037 M solution of methylamine is 4.97.

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The result compare to the value of keq given by the application as 1.33.

What is equilibrium?

Equilibrium is a state in a system where the rates of opposing processes are equal, resulting in no net change in the system over time. It is a state of balance between opposing forces or processes, where the system is in a stable, unchanging condition.

At equilibrium, the concentrations of N2, H2, and NH3 can be calculated using the equilibrium constant expression for the reaction:

The value of the equilibrium constant, Kc, can be calculated using the concentrations of the species at equilibrium, [N2], [H2], and [NH3].

Since the initial concentration of N2 and H2 is 1.0 mole each, the initial concentration of N2 can be assumed to be [N2] = 1.0 M, and the initial concentration of H2 can be assumed to be [H2] = 1.0 M. At equilibrium, the concentration of NH3 can be calculated using the expression for Kc and the initial concentrations of N2 and H2.

                                          N₂ + 3H₂ ⇒ 2NH₃

                                           1          1           0

Moles are equilibrium:     1/3         1         2/3

Total volume = 1L

Concentration at Eqm:

N₂ = 1/3 mol/l

H₂ = 1mol/l

NH₃ = 2/3 mol/l

[tex]$ K_{eq} = \frac{[NH_3]^2}{[N_2][H_2]^3}[/tex]

[tex]$ K_{eq} = \frac{[2/3]^2}{[1]^3[1/3]}[/tex]

[tex]$ K_{eq} = \frac{4}{3}[/tex]

[tex]$ K_{eq} = 1.33[/tex]

The result compare to the value of keq given by the application as 1.33.

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The elements in group 4-a not undergo ionic bonding as the do not forms the ion. Yes they do forms bond , they form covalent bonds.

The elements in group 4 (a) do not undergo the ionic bonding as the do not forms the ion. Yes they do forms bond , they form covalent bonds. The ionic bond forms between the positively charged ion and the negatively charged ion. The 4 (a) element do not form the ions.

They forms the covalent bond. The covalent bond forms between the atoms by the sharing of the electrons. The compounds formed by the covalent bond is called as the covalent compound.

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Both excitatory and inhibitory potentials undergo the same initial phase of synaptic potential production. The membrane depolarization brought on by the passage of an action potential opens voltage-gated calcium channels in the presynaptic neuron.

When all the excitatory and inhibitory inputs combine to bring the neuron's membrane potential to about -50 mV (see diagram), which is referred to as the action potential threshold, action potentials—the basic units of communication between neurons—occur.

Therefore, Variations in the conductance of ion channels in the postsynaptic membrane are also responsible for evoking synaptic potentials, which are the main input signals to which a neuron reacts.

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Both excitatory and inhibitory potentials undergo the same initial phase of synaptic potential production. The membrane depolarization brought on by the passage of an action potential opens voltage-gated calcium channels in the presynaptic neuron.

When all the excitatory and inhibitory inputs combine to bring the neuron's membrane potential to about -50 mV (see diagram), which is referred to as the action potential threshold, action potentials—the basic units of communication between neurons—occur.

Therefore, Variations in the conductance of ion channels in the postsynaptic membrane are also responsible for evoking synaptic potentials, which are the main input signals to which a neuron reacts.

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Sulfur (S): -2, Bromine (Br): -1, Iodine (I): -1, Lithium (Li): +1, Strontium (Sr): +2, Magnesium (Mg): +2, Sodium (Na): +1, Cesium (Cs): +1, Barium (Ba): +2, Fluorine (F): -1, Oxygen (O): -2.

Charges are based on gaining or losing electrons to achieve stable electron configurations.

We have,

To determine the charge of the common ion formed by each of these atoms, you need to consider their position on the periodic table and their tendency to gain or lose electrons to achieve a stable electron configuration.

Sulfur (S): -2 (gains 2 electrons to form S²⁻)

Bromine (Br): -1 (gains 1 electron to form Br⁻)

Iodine (I): -1 (gains 1 electron to form I⁻)

Lithium (Li): +1 (loses 1 electron to form Li⁺)

Strontium (Sr): +2 (loses 2 electrons to form Sr²⁺)

Magnesium (Mg): +2 (loses 2 electrons to form Mg²⁺)

Sodium (Na): +1 (loses 1 electron to form Na⁺)

Cesium (Cs): +1 (loses 1 electron to form Cs⁺)

Barium (Ba): +2 (loses 2 electrons to form Ba²⁺)

Fluorine (F): -1 (gains 1 electron to form F⁻)

Oxygen (O): -2 (gains 2 electrons to form O²⁻)

Charges are determined based on the number of valence electrons and the tendency to gain or lose electrons to achieve a full valence electron shell. Metals tend to lose electrons to form positive ions (cations), while non-metals tend to gain electrons to form negative ions (anions).

Thus,

Sulfur (S): -2, Bromine (Br): -1, Iodine (I): -1, Lithium (Li): +1, Strontium (Sr): +2, Magnesium (Mg): +2, Sodium (Na): +1, Cesium (Cs): +1, Barium (Ba): +2, Fluorine (F): -1, Oxygen (O): -2.

Charges are based on gaining or losing electrons to achieve stable electron configurations.

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The complete question:

What is the charge of the common ion formed by each of these atoms? Either -2,-1,+1, or +2.

S, Br, I, Li, Sr, Mg, Na, Cs, Ba, F, and O

How are these changes found?

Thorium-234 has a half-life of 24 days. There would be 12.5 gram remain after 72 days if you started with 100 grams.

Consider a nuclear half-life, or the amount of time required for a radioactive substance's initial sample to decay by half.

You are aware that the half-life of thorium-234 in your situation is 24 days. This implies that half of the thorium atoms in your sample will decay every 24 days.

Naturally, this correlates to saying that after 24 days, just half of the thorium atoms in your sample will remain.

A=A₀⋅1/2ⁿ, where

A₀ is the initial mass of the sample

n is the number of half-lives that pass in a given period of time.

In your case, you'd have 72 days

n = 72/ 24 = 3

so

A=A₀⋅1/2ⁿ

A =   100 grams. 1/2³

A = 12.5 gram

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