How many moles are present in 64.7 g of NaNO3?

ATP is not directly formed by any of the steps of the citric acid cycle. Option A is correct.

Although, the citric acid cycle produces some ATP indirectly through the electron transport chain, the production of ATP from the citric acid cycle does not occur directly in any of the steps of the cycle. The other options (CO₂, NADH, FADH₂, and coenzyme) are all directly involved in various steps of the citric acid cycle.

Citric acid cycle: The citric acid cycle, also known as the Krebs cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur in the mitochondria of eukaryotic cells and the cytoplasm of prokaryotic cells. It is a central metabolic pathway that completes the oxidation of carbohydrates, fats, and proteins, releasing energy that is used to produce ATP, the primary energy currency of the cell.

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The answer is c. Removing some CO (g). Removing some CO (g) will decrease the amount of CaO(8) in the system

The equilibrium expression for the reaction given is:

CaCO3(s) ↔ CaO(s) + CO2(g)

Removing some of the CO2(g) from the system will shift the equilibrium to the left, reducing the amount of CaO(s) in the system. This is because the reaction is exothermic and shifts to the side with the lower energy.

Mathematically, the reaction can be represented as:

CaCO3(s) + heat ↔ CaO(s) + CO2(g)

If we remove some of the CO2(g), the equation becomes:

CaCO3(s) + heat ↔ CaO(s)

This shift to the left reduces the amount of CaO(s) in the system.

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complete question:CaCO, (s) ở CaO (s) + CO, (g) AH' - 178 kJ/mol. The reaction system represented above is at equilibrium. Which of the following will decrease the amount of CaO(s) in the system?

a. Increasing the volume of the reaction vessel  

b. Lowering the temperature of the system

c. Removing some CO (g)

d. Removing some Caco, (s)

The ionic equation for solid forming is Cu2+(aq) + 2OH-(aq) → Cu(OH)2(s) and the ionic equation for the solid dissolving is Cu(OH)2(s) + 2OH-(aq) → Cu(OH)4 2-(aq).

Solid forming refers to the process of creating a solid object or structure from a material that is initially in a liquid, powder, or semi-solid state. This process can be achieved through a variety of methods, including casting, molding, extrusion, and additive manufacturing (3D printing).

Casting involves pouring molten metal or other material into a mold to create a specific shape as the material cools and solidifies. Molding is similar to casting, but typically involves using a preformed mold made of material such as plastic, silicone, or metal. Extrusion involves pushing a material through a die to create a continuous shape, such as a tube or rod.

• ionic equation for Solid forming:

Cu2+(aq) + 2OH-(aq) → Cu(OH)2(s)

Solid dissolving is a process by which a solid substance dissolves in a liquid to form a homogenous solution. In this process, the solid substance (solute) is broken down into individual molecules or ions, which are then surrounded by the molecules of the liquid (solvent).

The rate at which a solid dissolves in a liquid depends on a number of factors, including the surface area of the solid, the temperature of the liquid, and the concentration of the solute in the liquid. Generally, increasing the surface area of the solid, increasing the temperature of the liquid, and increasing the concentration of the solute in the liquid all increase the rate of dissolution.

The process of solid dissolving can be understood using the concept of intermolecular forces. The attractive forces between the molecules of the solute and solvent play an important role in the dissolution process. When the forces of attraction between the solute and solvent molecules are stronger than the forces holding the solute together, the solute dissolves in the solvent.

• Solid dissolving:

Cu(OH)2(s) + 2OH-(aq) → Cu(OH)4 2-(aq)

If you did not observe these changes, it is recommended to repeat the experiment on day 2.

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When the precipitate is washed, dried and weighed, then the percent by mass of silver in the alloy is 100%.

First, we need to determine the mass of the silver in the precipitate. We can do this by subtracting the mass of the filter paper from the mass of the filter paper and dried precipitate:

mass of precipitate = (mass of filter paper and dried precipitate) - (mass of filter paper)

mass of precipitate = 1.9332 g - 0.50000 g = 1.4332 g

Since all the silver in the alloy was converted to silver ions and then precipitated as silver chloride, the mass of silver in the precipitate is equal to the mass of silver in the original alloy. Therefore, the percent by mass of silver in the alloy is:

percent by mass of silver = (mass of silver / mass of alloy) x 100%

We just need to solve for the mass of silver. We know that the mass of the alloy was 4.3148 g, so the mass of silver must be:

mass of silver = mass of alloy - mass of other elements

Since we're assuming the alloy is pure silver and other elements, we can simply subtract the mass of the other elements from the mass of the alloy to get the mass of silver. We don't have information about the mass of other elements, but we can assume it's small enough to be negligible.

So, we have:

mass of silver = 4.3148 g - 0 g (assumed negligible) = 4.3148 g

Now we can calculate the percent by mass of silver:

percent by mass of silver = (mass of silver / mass of alloy) x 100%

percent by mass of silver = (4.3148 g / 4.3148 g) x 100%

percent by mass of silver = 100.00%

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7.90g  is the mass of a piece of iron that has a volume of 1.00 cm³.

It is the most abundant element on Earth by mass.

Iron has the chemical symbol Fe (from Latin: ferrum) as well as the atomic number 26. It is a metal from the periodic table's first transition series within group 8.

It is the most abundant element on Earth by mass, currently ahead behind oxygen (32.1% and 30.1%, respectively), and makes up much of the Earth's outer and inner cores.

density = mass /volume

7.90 g/cm³ = mass/ 1.00 cm³

mass = 7.90 ×1.00 g=7.90g

Therefore, 7.90g  is the mass of a piece of iron that has a volume of 1.00 cm³.

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The function of these materials you utilized in the lesson is bacteria, gene, recombinant DNA technology, plasmid vector, and protein expression system. We have employed a bacterium to propagate a gene that makes a specific plant protein that may hold a cure for stomach cancer.

Protein makes up the majority of the body's organs, tissues, and body parts, include muscle, bone, skin, or hair. It aids in the production of hemoglobin, which transports oxygen in the blood, and enzymes, which fuel a variety of chemical reactions. The majority of the body's organs, tissues, and body parts, including muscle, bone, skin, and hair, are made of protein. It aids in the production of hemoglobin, which transports oxygen in the blood, and enzymes, which fuel a variety of chemical reactions. At least 10,000 different proteins make up you, and they also keep reader that way.

Every cell in the human body has protein.  To repair damaged cells and create new ones, your body needs protein in your diet. For toddlers, teenagers, and expectant women to develop properly and expand to their full potential, protein is crucial.  It accelerates metabolic reactions, synchronizes biological processes, and promotes tissue growth and repair. Proteins give your body its structural support and ensure optimal pH and fluid equilibration.

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The matching of likely structure of the ion responsible for the base peak at 105, 72, 198,200, 91 and 43 differently.

The explanation and matching structure of the ions are given below:

a) The likely structure of the ion responsible for the base peak at 105 is a benzene ring with a substituent containing a nitrogen atom, such as aniline or N-methylaniline.

b) The likely structure of the ion responsible for the base peak at 72 is a methyl group, possibly as a fragment of a larger molecule.

c) The doublet at 198 and 200 suggests the presence of an isotope, and the base peak at 91 suggests the presence of a nitrogen-containing functional group, so a likely structure for the ion is an N-oxide functional group, such as a pyridine N-oxide.

d) The likely structure of the ion responsible for the base peak at 91 is a nitrogen-containing functional group, such as an amine or pyridine ring, and the large peak at 43 is likely a fragment containing a single nitrogen atom, such as NH2 or CH3N.

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When you are sweating or shivering, you are exhibiting your limits of tolerance.

The human body can only withstand certain amounts of environmental stress. A key element in defining the body's tolerance limitations is temperature. Only a small range of temperatures is tolerable for the human body, and both hypothermia and hyperthermia can be fatal. Air pressure and humidity both have an impact on how well the body can withstand the environment. Altitude sickness and dehydration are both caused by low air pressure and high humidity, respectively. The body's capacity to endure the environment can also be impacted by pollution and chemical exposure. While exposure to radiation can result in cancer and genetic damage, noise pollution can also induce stress and hearing loss. Overall, a complex interplay of many environmental influences affects the human body's tolerance thresholds.

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The number of moles in 5.00 × 10²³ formula units of BaBr₂ is approximately 0.83 moles, calculated by dividing the given number of formula units by Avogadro's number (6.022 × 10²³).

To determine the number of moles in 5.00 × 10²³ formula units of BaBr₂, you have to know the Avogadro's number, which is 6.022 × 10²³ formula units per mole.

Therefore, using Avogadro's number, you divide the given number of formula units by this value. So, the calculation is as follows: 5.00 × 10²³ formula units / 6.022 × 10²³ formula units per mole = 0.83 moles of BaBr₂.

So, there are approximately 0.83 moles in 5.00 × 10²³ formula units of BaBr₂.

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The ram of a pile driver drops onto the top of an iron beam, driving it partway into the ground. the distance that the beam sinks into the ground depends on the:

Potential energy is the energy possessed by an object because of its position with respect to a reference. An example of potential energy is a stone placed on the edge of a table has a different potential energy from a stone placed on the floor.

For example, an unused bow will have zero potential energy. However, when pulled, this bow will have potential energy because of the tendency of the arrow to return to its original position.

Kinetic energy is the energy an object has because of its motion. The higher the speed of a moving object, the greater the energy it has.

For example, suppose a stone is dropped from a table into a glass below. When the glass is still on the table, the potential energy is great.

Then, just before the rock hits the glass, its potential energy approaches zero. However, the further down the motion energy is also greater. This motion energy causes the glass to break.

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Benzoquinone is created when the hydroquinone reacts with the hydrogen peroxide that is breaking down (C6H4O2). The oxygen and hydrogen reaction causes

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The reaction of benzene with succinic anhydride in the presence of aluminum chloride as a catalyst is a Friedel-Crafts acylation reaction. The product obtained from this reaction is benzene-1,4-dicarboxylic acid.

A carbonyl group is a functional group that consists of a carbon atom double-bonded to an oxygen atom (C=O). It is a polar group and is found in a variety of organic compounds, such as aldehydes, ketones, carboxylic acids, esters, amides, and others.

carbonylgroup from succinic anhydride adds to one of the ortho- or para- positions of benzene, but the resulting intermediate is unstable and rearranges to the more stable meta- isomer. The final product is the result of two such additions to opposite carbons of the succinic anhydride.

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To calculate the total pressure of the mixture, we need to add up the partial pressures of all the gases in the mixture. The partial pressures given are:

Ar: 749 torr

O2: 11,235 torr

N2: 803 torr

Other gases (assumed to be negligible): 699 torr

Therefore, the total pressure of the mixture is:

749 torr + 11,235 torr + 803 torr + 699 torr = 13,486 torr

Therefore, the total pressure of the mixture is 13,486 torr.

The overall pressure ptot is the total of all pressures in a reference system. This pressure, according to Bernoulli (see Fluid mechanics), consists of the static pressure p, the dynamic pressure pdyn, and the geodetic component ( g z) that exists in a fluid along a stream line in a frictionless flow.

The total pressure of a gas mixture is the sum of its component gases' partial pressures: Ptot = ∑Pi = P1 + P2 + P3... ntot = total number of moles in the gas mixture (the sum of all ni).

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The quantum numbers show the position of the electrons.

The question has unclear options hence I would discuss the quantum numbers generally.

In quantum mechanics, the allowed quantum numbers depend on the physical system under consideration. However, in the case of an electron in an atom, the allowed quantum numbers are:

Principal quantum number (n): determines the overall energy and distance from the nucleus, where n = 1, 2, 3, and so on.

Azimuthal quantum number (l): determines the angular momentum and the shape of the orbital, where l can range from 0 to (n-1).

Magnetic quantum number (m): determines the orientation of the orbital in space, where m can range from -l to l.

Spin quantum number (s): determines the intrinsic angular momentum of the electron, where s = ±1/2.

The combination of these quantum numbers completely specifies an electron's state in an atom.

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The answers for following multiple question are given below.

(a)The equilibrium pressure of NH3 gas would remain unaffected. KP = (PNH3)(PH2S). Thus the amount of solid NH4HS present usually does not affect the equilibrium of the reaction.

(b) Generally, the equilibrium pressure of NH3 gas would decrease. In order for the pressure equilibrium to be constant, KP, to remain constant, the equilibrium pressure of NH3 must decrease when the pressure of H2S is increased. KP = (PNH3)(PH2S). (The complete explanation is based on the LeChatelier’s principle is also acceptable.)

(c) The mass of NH4HS increases because a decrease in volume causes the pressure of each gas to increase. To maintain the value of the pressure equilibrium constant, Kp, the pressure of each of the gases must decrease. The decrease in pressure is realized by the formation of more solid NH4HS. Kp = (PNH3)(PH2S). (A complete explanation based on LeChatelier’s principle is also acceptable.)

(d) Basically, the mass of NH4HS decreases because the endothermic reaction absorbs heat and goes nearer to completion (to the right) as the temperature increases.

Generally, for any chemical reaction, the equilibrium constant can be defined as the ratio between the amount of reactant and the amount of product which is used to determine chemical behaviour. At equilibrium, for any reaction, Rate of the forward reaction = Rate of the backward reaction.

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              H

              |

H2C = CH - C ≡ N

              |

              H

This is a repeat unit of acrylonitrile. Three such units together, with hydrogen atoms on each end, would be drawn as:

 H          H

 |          |

H2C = CH - C≡N-CH2-CH=C H - C≡N

             |           |

             H           H

What is acrylonitrile?

Acrylonitrile is a colorless, liquid organic compound with the chemical formula C3H3N. It is an important monomer used in the production of various synthetic polymers, such as polyacrylonitrile, which is used in the manufacture of carbon fibers, and acrylonitrile-butadiene-styrene (ABS), a thermoplastic used in various applications such as automotive parts, toys, and electronic housings. Acrylonitrile is also used as a fumigant, in the production of specialty chemicals, and as a precursor to various pharmaceuticals. It is a highly reactive compound and must be handled with care due to its toxicity and flammability.

Hence, the answer is,

 H          H

 |          |

H2C = CH - C≡N-CH2-CH=C H - C≡N

             |           |

             H           H

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Answer:

Many moles are formed

Explanation:

The power supply connector that is designed to provide power to a new hard drive in a desktop computer is the SATA power connector.

What is Hard Drive?

A hard drive, also known as a hard disk drive (HDD), is a type of data storage device that uses magnetic storage to store and retrieve digital information on a computer.

Hard drives consist of one or more rigid, rotating platters coated with a magnetic material, and a read/write head that moves over the platters to read and write data. The platters are spun at high speeds by a motor, while the read/write head floats just above the surface of the platters, using magnetic fields to read and write data.

SATA (Serial Advanced Technology Attachment) power connectors are used to provide power to SATA hard drives, as well as to other SATA devices such as optical drives and solid-state drives (SSDs). The SATA power connector is a small, rectangular, 15-pin connector that is typically located on the power supply cable coming from the power supply unit (PSU) in a desktop computer.

If your new hard drive requires power from the power supply unit, you will need to connect a SATA power connector to the drive's power port, which is usually located on the back of the drive. Some older hard drives may use a different type of power connector, such as the 4-pin Molex connector, but SATA is the most common type of power connector used for modern hard drives.

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The elements that would be the good selection as the sacrificial electrode in the cathodic protection of tin, Sn is the correct option is III. Nickel and IV. Magnesium.

The Sacrificial anodes are helpful to protect the metal structures from the corroding. The Sacrificial anodes will work by the oxidizing to quickly as compared to the  the metal that is protecting, and that is being consumed completely  and before the other metal will reacts with the electrolytes. The Sacrificial anodes is the metals or the alloys that is attached to the hull that is more anodic.

Thus, the nickel and magnesium is used as the sacrificial electrode in the cathode protection of the tin.

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Answer:  To date, approximately 1,200 dinosaur skeletons have been discovered.

Scientists can only guesstimate the other parts of the bodies of dinosaurs because a lot of times, partial skeletons have been found. Or even, when a full skeleton has been found, the skin and organs and everything else are gone. This leaves the scientists to make educated guesses about how they stood, what they looked like and everything else in between based on the skeletons they've found.

To draw an alternative Lewis structure, we need to move electrons to form a double or triple bond between the nitrogen atom and another atom in the molecule. We can also move electrons to form a lone pair on another atom in the molecule. The goal is to achieve a more stable structure with formal charges as close to zero as possible.

For example, consider the incomplete Lewis structure:

H

|

N

One possible resonance structure is:

H

|

N=H

In this structure, we have formed a double bond between the nitrogen atom and one of the hydrogen atoms. We have also placed a lone pair of electrons on the other hydrogen atom.

The formal charge on the nitrogen atom in this structure is:

Valence electrons in nitrogen = 5

Non-bonding electrons = 2

Number of bonds = 1

Formal charge = Valence electrons - Non-bonding electrons - 1/2(Number of bonds) = 5 - 2 - 1/2(1) = 2

Therefore, the formal charge on the nitrogen atom in this structure is +2.

Note that this is just one possible resonance structure. There may be other valid resonance structures that can be drawn, and the actual distribution of electrons in the molecule is a combination of all possible resonance structures.

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Answer:

A new organism in an ecosystem can either greatly downgrade the quality of the ecosystem, upgrade, or bring no significant changes. Although it does usually benefit the ecosystem, it's safe to say some organisms may bring a decline to vital animals already present in the ecosystem. For example, if a new and quite aggressive species are introduced to the ecosystem, it may not have natural predators that would control its amount. That would cause an overabundance of that species and a decline in other organisms that they feed on. It can overbreed and spread throughout the ecosystem eating all the species that can't compete with them (due to the fact that the ecosystem does not have a defense against them).

It's 8 points and you didn't even say thanks to the person who answered for you. smh

The statements that true is  A weak acid solution consists of mostly insoluble acid molecules.

The definition of a weak acid is something that partially dissociates into a solvent. This also implies that the majority of the molecules in a mild acid solution continue to be insoluble in their natural state.

A strong electrolyte is a solution in which all solute particles entirely separate into ions in a solvent.

A weak electrolyte, on the other hand, is a solution in which solute particles only partially split apart into ions.

As like dissolves like, a molecular compound is a covalent compound. In polar solvents like water, molecular molecules cannot dissolve.

Your question is incomplete but most probably your full question was Choose the statement below that is TRUE.

a. A weak acid solution consists of mostly non-ionized acid molecules.

b. The term "strong electrolyte" means that the substance is extremely reactive.

c. A strong acid solution consists of only partially ionized acid molecules.

d. The term "weak electrolyte" means that the substance is inert.

e. A molecular compound that does not ionize in solution is considered a strong electrolyte.

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Diet Coke will float in a large container of water because it has less mass and therefore has less density than regular Coke.

The relationship between density and floating is that an object will float in a fluid if it is less dense than the fluid. This is because buoyant force, which is the upward force exerted by a fluid on an object immersed in it, is greater than the weight of the object.

On the other hand, an object will sink in a fluid if it is more dense than the fluid, because the weight of the object is greater than the buoyant force acting on it.

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[tex]7.7 g[/tex] of N2 can be made when 132 grams of CuO are consumed.

The equation can be written as: NH3 + 3CuO → 3Cu + N2 + 3H2O

To calculate the amount of N2 produced in grams when 132 grams of CuO is consumed, we need to use the molar mass of each element.

Molar Mass of N2 = [tex]14 g/mol[/tex]

Molar Mass of CuO = [tex](63.5 + 16) g/mol = 79.5 g/mol[/tex]

Therefore, the number of moles of CuO consumed is [tex]\frac{ 132}{79.5} = 1.65 mol[/tex]

The ratio of N2 to CuO in the equation is 1 : 3. Therefore, the number of moles of N2 produced is[tex]\frac{1.65}{3 }= 0.55 mol.[/tex].

Now, to calculate the mass of N2 produced, we need to multiply the number of moles of N2 produced by the molar mass of N2, i.e. [tex]0.55 * 14 = 7.7 g.[/tex]

Therefore, the answer is [tex]7.7 g[/tex] of N2 can be made when 132 grams of CuO are consumed.

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complete question:2 NH3  +  3 CuO → 3 Cu  +  N2  +   3 H2O

In the above equation, how many grams of N2 can be made when 15 moles of CuO are consumed?

Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0

Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:

Element Molar Mass

Hydrogen 1

Nitrogen 14

Copper 63.5

Oxygen 16

The properly represents the order of orbital filling based on the relative energy of the orbitals is:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.

Orbitals are the regions or regions in space around the atomic nucleus that have the highest probability of finding electrons. In the arrangement of the orbital diagram, an electron is symbolized by an arrow facing up which represents an electron with spin +½, or facing down which represents an electron with spin -½. To mark the distribution of orbitals within the atom, these arrows are placed on a horizontal line, in a circle, or generally in a box.

Orbital diagrams are used to facilitate the determination of the value of the quantum numbers, namely the magnetic quantum number and the spin quantum number.

Your question is incomplete but most probably your full question was:

Which of the following properly represents the order of orbital filling based on the relative energy of the orbitals?

Multiple Choice

1s 2s 3s 4s 2p 3p 4p 3p

1s 2s 2p 3s 3p 3d 4s 4p

1s 2s 2p 3s 3d 3p 4s 4p

1s 2s 2p 3s 3p 4s 3d 4p

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The vapor pressure of the substance at 29°C is 622.5 mm Hg.

Vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. It is often used as a measure of a substance's ability to vaporize.

The Clausius-Clapeyron equation can be used to calculate the vapor pressure of a substance at a given temperature by using the boiling temperature (Tb) and vapor pressure (Pb) at the boiling point. The equation is given by:

ln(P2/P1) = (AHvap/R)(1/T1 - 1/T2)

where P2 and T2 are the vapor pressure and temperature of interest, P1 and T1 are the vapor pressure and temperature at the boiling point, AHvap is the enthalpy of vaporization, and R is the universal gas constant.

For this problem, we are given T1 = 76°C, P1 = 714.6 mm Hg, AHvap = 38.7 kJ/mol, and R = 8.31 J/K mol. We want to calculate the vapor pressure at T2 = 29°C.

Using the equation above, we can calculate the vapor pressure at T2 as follows:

ln(P2/714.6) = (38.7 kJ/mol)(1/298.15 K - 1/303.15 K)

ln(P2/714.6) = (38.7 kJ/mol)(-0.0033 K-1)

ln(P2/714.6) = -0.128

P2 = e-0.128 x 714.6 = 622.5 mm Hg

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The work done by the gas during an expansion is, -0.0242 MJ.

The work done by the gas during an expansion is given by the equation:

w = -P_extΔV

where P_ext is the external pressure,

ΔV is the change in volume of the gas.

The gas is expanding from an initial volume of 1.00 L to a final volume of 25.0 L, so:

ΔV = V_final - V_initial = 24.0 L

The external pressure is given as 1.00 atm = 1.01 × 10^-3 MPa

The work done by the gas is:

w = -P_extΔV = -(1.01 × 10^-3 MPa)(24.0 L) = -0.0242 MJ

Note that the negative sign indicates that the work is done by the gas on the surroundings.

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A: 2,4-dinitrophenol (DNP) is the compound that uncouples electron transport from ATP synthesis and allows H+ back across without ATP synthase.

DNP is a protonophore that acts by making the inner mitochondrial membrane leaky to protons. This causes a disruption of the proton gradient that drives ATP synthesis by the ATP synthase, which in turn uncouples the electron transport chain from ATP synthesis. This can result in a decrease in the efficiency of cellular respiration, and in some cases, can be toxic to cells. In contrast, the other compounds listed (rotenone, oligomycin, antimycin A, and cyanide) act by inhibiting various components of the electron transport chain and do not directly uncouple electron transport from ATP synthesis.

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Number of half-lives is 3

The decay of this radioactive unknown compound is a first-order process.

We can express the time dependence of its mass m using a first-order integrated rate law, where k is the rate constant:

mt = mass at time t

m0 = initial mass

t = time

Procedure:

1) We need to find "k":

From the first-order rate law we clear k,

[tex]\frac{mt}{mo} = e^{-kxt}[/tex]

㏑[tex](\frac{mt}{mo})= -kxt[/tex]

[tex]\frac{ln(\frac{mt}{mo}) }{-t} = k[/tex]

[tex]k=\frac{ln(\frac{65.59ng}{ 524.7 ng} )}{-47 }[/tex]

k = 0.044[tex]days^{-1}[/tex]

2) We find the half-life from the value of k we have just calculated:

[tex]t\frac{1}{2}[/tex] =[tex]\frac{ln2}{k}[/tex] = 15.7days

3) The number of half-lives of the unknown sample is:

Number of Half-lives = 47 days / 15.7 days = 3 (approx.)

Hence 3 is a correct answer.

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