A 1435 mL sample of drinking water was found to contain 16. 0 mg of lead. Calculate the concentration of lead in milligrams per liter

The ion with the smallest number of unpaired electrons is Ni2+.

The number of unpaired electrons in an ion depends on its electronic configuration, specifically the number of electrons in its partially filled d-orbitals.

Out of the given ions, V2+ and Cr2+ have the electronic configurations [Ar] 3d3 and [Ar] 3d4 respectively, and both have three unpaired electrons.

Ni2+ has the electronic configuration [Ar] 3d8, and it has two unpaired electrons.

Co2+ has the electronic configuration [Ar] 3d7, and it has three unpaired electrons.

Fe3+ has the electronic configuration [Ar] 3d5, and it has five unpaired electrons.

Therefore, Ni2+ has the smallest number of unpaired electrons among the given ions with two unpaired electrons.

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The following are categorized into isometric and isotonic:
Isometric: Pushing constantly against a concrete wall, Holding a bench-press bar in the same position, Doing a plank exercise (holding a push-up position), and Balancing on tiptoes.

Isotonic: Running up a hill, Swimming freestyle, Pedaling a bicycle on a flat surface, and Doing bicep curls.

Isometric exercises are exercises where a muscle or group of muscles contracts without any change in length. These exercises involve the muscle or group of muscles contracting against an immovable object or against an opposing force. Examples of isometric exercises are pushing against a wall, holding a plank, and doing a wall sit.

Isotonic exercises are exercises that involve the muscle or group of muscles contracting against resistance, and causing a change in the muscle’s length. These exercises involve the muscle or group of muscles contracting and then extending against a fixed weight or external force.

Examples of isotonic exercises are running up a hill, swimming freestyle, pedaling a bicycle on a flat surface, doing bicep curls, and doing leg extensions.

1. Pushing constantly against a concrete wall - Isometric Exercise
2. Running up a hill - Isotonic Exercise
3. Swimming freestyle - Isotonic Exercise
4. Pedaling a bicycle on a flat surface - Isotonic Exercise
5. Holding a bench-press bar in the same position - Isometric Exercise
6. Doing a plank exercise (holding a push-up position) - Isometric Exercise
7. Balancing on tiptoes - Isometric Exercise
8. Doing bicep curls - Isotonic Exercise

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The partial pressure of nitrogen is 0.116 atm and the partial pressure of helium is 0.583 atm.

To find the partial pressures of nitrogen and helium, we can use the fact that the total pressure of the mixture is equal to the sum of the partial pressures of each component:

P_total = P_O2 + P_He + P_N2

We are given the partial pressure of oxygen as P_O2 = 0.300 atm. We can find the total number of moles of gas in the mixture as:

n_total = n_O2 + n_He + n_N2 = 1.50 mol + 2.50 mol + 0.500 mol = 4.50 mol

We can use the mole fraction of each component to find the partial pressure of nitrogen and helium.

X_N2 = n_N2 / n_total = 0.500 mol / 4.50 mol = 0.111

X_He = n_He / n_total = 2.50 mol / 4.50 mol = 0.556

The mole fraction of oxygen is then:

X_O2 = n_O2 / n_total = 1.50 mol / 4.50 mol = 0.333

We can use these mole fractions to find the partial pressures of nitrogen and helium:

P_N2 = X_N2 * P_total = 0.111 * P_total

P_He = X_He * P_total = 0.556 * P_total

Substituting the given value for P_O2 and adding the expressions for P_N2 and P_He, we get:

P_total = P_O2 + P_N2 + P_He

P_N2 + P_He = P_total - P_O2 = (1.000 atm - 0.300 atm) = 0.700 atm

Substituting the expressions for P_N2 and P_He in terms of mole fractions, we get:

0.111 * P_total + 0.556 * P_total = 0.700 atm

0.667 * P_total = 0.700 atm

P_total = 1.049 atm

Now we can use the expressions for P_N2 and P_He in terms of mole fractions to find their partial pressures:

P_N2 = 0.111 * P_total = 0.116 atm

P_He = 0.556 * P_total = 0.583 atm]

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In the solid phase, the atoms of a substance are closely packed together and held in a fixed position by intermolecular forces. In the case of ice, which is a solid form of water, the atoms are arranged in a regular pattern, forming a crystal lattice structure.

The motion of atoms in the solid phase is limited to small vibrations around their fixed positions. These vibrations are caused by thermal energy, but they are not significant enough to overcome the intermolecular forces that hold the atoms in place. As a result, the shape of the solid, including ice, is definite and maintains a fixed shape.

The volume or amount of space taken up by a solid, including ice, is also definite. The intermolecular forces between the atoms prevent them from moving around freely, and as a result, the solid has a fixed volume.

Overall, in the solid phase, such as ice, the arrangement of atoms is regular and fixed, and their motion is limited to small vibrations around their fixed positions. The volume or amount of space taken up is definite, and the shape is also definite and maintains a fixed shape.

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We can use the solubility product constant (Ksp) for lead(II) chloride, which is 1.17 x 10-5 to determine the concentration of the lead ion (Pb2+) that must be exceeded to precipitate PbCl2 from a 1.00 x 10-2 M solution of chloride ions (Cl-).

The equilibrium constant for a solid material dissolving in an aqueous solution is denoted by the solubility product constant, which is abbreviated as Ksp. It is a measurement that indicates how much of a solute may be dissolved in a solution. The Ksp value of a material is greater when it has a higher degree of solubility.

The dissociation reaction for PbCl2 in water is:
PbCl2(s) ⇌ Pb2+(aq) + 2Cl-(aq)

The Ksp expression for this reaction is:
Ksp = [Pb2+][Cl-]^2

We are given the concentration of Cl- as 1.00 x 10^-2 M. Let [Pb2+] = x, so we can plug in the values into the Ksp expression:
1.17 x 10^-5 = x(1.00 x 10^-2)^2

Now, solve for x:
x = (1.17 x 10^-5) / (1.00 x 10^-2)^2
x ≈ 1.17 x 10^-1

Therefore, the concentration of lead ion (Pb2+) that must be exceeded to precipitate PbCl2 from the solution is approximately 1.17 x 10^-1 M.

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To solve this problem, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

PV = nRT

where P is the pressure in Pa, V is the volume in m³, n is the number of moles, R is the ideal gas constant (8.31 J/(molₓK)), and T is the temperature in Kelvin.

First, we need to convert the pressure from kPa to Pa and the volume from L to m³:

P = 1.70x10² kPa x 1000 Pa/kPa = 1.70x10⁵ Pa

V = 9.300x10¹ L x 0.001 m³/L = 0.093 m³

Next, we need to calculate the number of moles of ammonia using its molar mass:

molar mass of ammonia (NH3) = 14.01 g/mol + 3(1.01 g/mol) = 17.03 g/mol

moles of NH3 = 5.9000x10¹ g ÷ 17.03 g/mol = 3.462 mol

Now we can rearrange the ideal gas law to solve for the temperature:

T = PV ÷ nR

T = (1.70x10⁵ Pa)(0.093 m³) ÷ (3.462 mol)(8.31 J/(molₓK))

T = 686.3 K

Therefore, at a temperature of 686.3 K (413.1 °C or 775.6 °F), 5.9000x10¹ g of ammonia gas would exert a pressure of 1.70x10² kPa in a 9.300x10¹ L container.

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The oxidation number of manganese (Mn) in potassium permanganate (KMnO4) is B.  +7.

Potassium permanganate is a strong oxidizing agent that is commonly used in organic chemistry to oxidize alcohols, aldehydes, and ketones to carboxylic acids. Its formula is KMnO4.The oxidation state of manganese in KMnO4 is determined by subtracting the sum of the oxidation states of potassium, oxygen, and hydrogen from the overall charge of the molecule. The oxidation state of potassium is +1, and the oxidation state of oxygen is -2. Hydrogen's oxidation state is +1, and it is usually removed from the organic compound in question, so it is not included in the final calculation. For KMnO4, the overall charge is -1. Using this information,

we can calculate the oxidation state of manganese as follows: Oxidation state of Mn + Oxidation state of K + 4(Oxidation state of O) = -1Oxidation state of Mn + 1 + 4(-2) = -1Oxidation state of Mn - 7 = -1 Oxidation state of Mn = +7Therefore, the oxidation state of manganese in potassium permanganate is +7. Therefore the correct option is B

The complete question is :

What is the oxidation number of manganese (MN) in potassium permanganate (KMnO4)?

A. +5,

B. +7,

C. +8,

D. +9

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Understanding matter and its properties helped humans move from the stone age to the iron age by enabling them to develop new materials and technologies. In the stone age, humans used materials such as stone, bone, and wood to create tools and weapons. However, these materials had limitations in terms of their strength, durability, and ability to hold a sharp edge.

As humans began to understand the properties of matter, they were able to experiment with new materials and processes. For example, they learned that by heating certain rocks, they could extract metals such as copper and tin, which could be used to create stronger tools and weapons. By combining copper with tin, they discovered that they could create bronze, which was even stronger and more durable.

Eventually, humans discovered how to extract iron from iron ore and use it to create even stronger tools and weapons. This knowledge of matter and metallurgy enabled humans to advance technologically and culturally, leading to the development of civilizations and the rise of empires.

In summary, understanding the properties of matter helped humans move from the stone age to the iron age by enabling them to experiment with new materials and develop new technologies. This process of discovery and innovation continues to this day, as scientists and engineers continue to push the boundaries of our knowledge and understanding of the natural world.

The statement "the instantaneous rate of a reaction can be read directly from the graph of molarity versus time at any point on the graph." is False

Instantaneous rate of reaction is the rate at which a chemical reaction is occurring at a specific moment in time.

It is the slope of the tangent line at that particular point in time. The instantaneous rate of a reaction can be determined from a graph of concentration vs time.

We must draw a tangent line at the point in the graph that we are interested in, and the slope of that tangent line is the instantaneous rate of the reaction.

The rate can also be determined by finding the slope of a secant line over a very small time interval.

So, the given statement, “the instantaneous rate of a reaction can be read directly from the graph of molarity versus time at any point on the graph” is not true, and the correct answer is False.

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Answer: In the Picture all the question has been done

Explanation:

Atoms are made up of three subatomic particles: protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus of an atom.

They have a mass of approximately 1 atomic mass unit (AMU). Neutrons, also found in the nucleus, have no charge and have a mass of approximately 1 amu. Electrons are negatively charged particles that orbit around the nucleus in shells or energy levels. They have a much smaller mass than protons and neutrons and are responsible for chemical reactions and bonding between atoms. Understanding the properties and behaviors of these subatomic particles is crucial in understanding the nature of matter and the physical world around us.

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It would take approximately 4858.35 years for 250 kg of radium to decay down to less than 10 kg.

The amount of time it takes for a given amount of radium to decay to a certain level can be determined using the radium's half-life. This can be done using the following formula:

Amount of time = Half-life x ln (Initial amount/Final amount)

Given that radium has a half-life of 1500 years, we can use this formula to determine the amount of time it takes for 250 kg of radium to decay down to less than 10 kg.

Initial amount of radium = 250 kg

Final amount of radium = 10 kg

Half-life of radium = 1500 years

Amount of time = Half-life x ln (Initial amount/Final amount)

Amount of time = 1500 x ln (250/10)

Amount of time = 1500 x ln (25)

Amount of time = 1500 x 3.2189

Amount of time ≈ 4858.35 years

Therefore, it would take 4858.35 years.

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A limiting reagent refers to the reagent present in a reaction that will limit the quantity of product generated. The yield of a reaction is calculated by calculating the percent yield. The percent yield is a percentage representation of the number of products generated by a reaction compared to the amount of product that should be generated based on stoichiometry or the total number of products that should be generated in the absence of loss or side reactions.

In cases where a reagent other than styrene is the limiting reagent, the presumptions made for the calculations become invalid, and hence the calculated results become inaccurate or unreliable. The reason why a reagent other than styrene could become the limiting reagent is as follows:

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According to the VSEPR theory, the shape of a molecule is determined by the repulsion between its electron pairs, both bonding and non-bonding.

In sulfuryl fluoride (SO2F2), the sulfur atom is surrounded by four regions of electron density: two single bonds with fluorine atoms and two double bonds with oxygen atoms. These four regions of electron density repel each other and arrange themselves as far apart as possible to minimize repulsion.

Since the molecule has no lone pairs of electrons, the electron density is evenly distributed among the four regions around sulfur. This results in a tetrahedral shape, where the fluorine atoms and oxygen atoms are arranged symmetrically around the central sulfur atom, with bond angles of approximately 109.5 degrees.

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c. Easily Gain Electrons. Easily Gain Electrons belongs to metal elements.

Metal elements are characterized by having relatively low ionization energies and high electronegativities. This allows them to easily gain electrons from other elements in chemical reactions.Metals are chemical elements that are characterized by their ability to conduct electricity, have a metallic luster, and are malleable and ductile. They are divided into two main categories: ferrous metals, which contain iron, and non-ferrous metals, which do not.An atom can easily gain electrons by participating in a redox reaction. This is when electrons are transferred between two atoms, and the atom that receives the electrons gains them.

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The given statement is true. Zeolites hypothetically can be made attractive by adding sodium particles to them. Zeolites are utilized as sponges just and have no different purposes.

A compelling method for testing how much red color is in a watery arrangement is to gauge how much red light (620-750 nm) is consumed by the arrangement.

The expression "zeolite" was first utilized in the year 1756 by Axel Fredrik Cronstedt, a Swedish mineralogist. During a course of quickly warming a material that was seen to be stilbite, it delivered a lot of steam. This was because of the water that the material had retained before. Subsequent to seeing such turns of events, he authored the term zeolite. It has been gotten from the Greek words, ζέω (zéō), signifying "to bubble" and λίθος (líthos), signifying "stone".

Engineered zeolites are normally blended by a course of slow crystallization of a silica-alumina gel within the sight of salts and natural layouts. Curiously, various designs could be made utilizing this interaction. Aside from varieties in structures, zeolites can be fabricated or produced using different iotas making them synthetically fascinating and dynamic. For example, purported heteroatoms incorporate germanium, iron, gallium, boron, zinc, tin, and titanium.

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Answer:

Explanation:

The main reason why California has areas that are colder than Nevada, despite being at similar latitudes, is due to the influence of ocean currents. Specifically, California is impacted by a cold ocean current known as the California Current, which flows southward along the western coast of North America, while Nevada is an inland state without access to any major ocean currents.

The California Current brings cool water from the Gulf of Alaska down the coast, resulting in lower temperatures along the California coast, particularly in the northern regions. In contrast, Nevada has a desert climate with high temperatures and low humidity, due to its inland location and lack of major bodies of water.

So, the correct option would be "Cold ocean currents travel across California." (Option 2).

The molar mass of the compound is 128.4 g/mol.

The empirical formula is an empirical formula that represents the lowest whole-number ratio of the atoms present in a compound. The empirical formula for the molecular compound is calculated using the percentage composition of the elements present in the compound. The steps used to find the empirical formula are as follows:

Find the mass of each element present in the compound.Convert each mass to moles.Divide each mole value by the smallest number of moles.Round to the nearest whole number and write the subscripts.The molar mass is the mass of a substance that contains 6.02 × 10²³ atoms or molecules. To calculate the molar mass of a compound, add the masses of all the atoms present in the compound.

C=0.707g,12.01 g/mol=0.0588 molCnH=0.2372 =1.01g/m=0.235 mol H

nH=4nC

The empirical formula of the compound is CH4. The molar mass of the compound can be calculated using the empirical formula.

M=12.01 g/mol+4(1.01 g/mol)=16.05 g/mol

The molar mass of the compound is 8 times the empirical mass, so the actual molar mass is;

M=8(16.05{g/mol})=128.4g/mol. The molar mass of the compound is 128.4 g/mol.

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The ligand field splitting energy in the complex in units of kilojoules per mole when the solutions of the [V(OH2)6]2 ion are lilac and absorb light of wavelength 806 nm is 331kJ/mol. To calculate the ligand field splitting energy in the complex.

The ligand field splitting energy in the complex can be calculated by the following formula:Δoct = hc/λ Where,Δoct = Ligand field splitting energy hc = Planck's constant (6.626 x 10^-34 J s)λ = wavelength of light absorbed In the given problem, the absorbed wavelength of light is 806 nm. So we need to convert it into meters as we have to use the value in the formula. c = speed of light = 3.0 x 10^8 m/sλ = 806 nm = 806 x 10^-9 m Substituting the values in the formula:Δoct = hc/λ = (6.626 x 10^-34 J s) x (3.0 x 10^8 m/s) / (806 x 10^-9 m) = 2.477 x 10^-19 J= 2.477 x 10^-19 J x 1 kJ/1000J x NA Where NA is Avogadro's number (6.022 x 10^23)Thus, Δoct = 331 kJ/mol (approx.)Therefore, the ligand field splitting energy in the complex in units of kilojoules per mole is 331 kJ/mol.

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The correct option is c. 75.36g.  The given oxide is named Potassium Superoxide, as it contains O2-anion which is known as superoxide.

As per the mole concept,

1 mol of the compound holds a similar measure of the compound as demonstrated by its molar mass.

In this way, here,

Molar mass is= 94.2 g/mol

Implies, 1 mol of compound holds 94.2 g of it

In this way, 0.8 mol of compound holds (94.2×0.8) g of it = 75.36 g

Thus, the right response is-75.36 g.

The mole concept is a helpful technique for communicating how much a substance is. Any estimation can be separated into two sections - the mathematical extent and the units that the greatness communicated. For instance, when the mass of a ball is estimated to be 2 kilograms, the size is '2' and the unit is 'kilogram'.

While managing particles at a nuclear (or molecular) level, even one gram of an unadulterated component is known to contain an enormous number of iotas. This is where the mole concept is generally utilized. It basically centers around the unit known as a 'mole', which is a count of an extremely enormous number of particles.

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Answer:

A Single replacement/displacement reaction will occur, making the equation:

Calcium + Lead (II) nitrate → Calcium Nitrate + Lead (II)

Ca + Pb(NO3)2 → Ca(NO3)2 + Pb

Explanation:

Calcium is more reactive than Lead in the reactivity series so theoretically will replace in Lead in Lead Nitrate, forming Calcium Nitrate.

Hopefully this helps!!!

AgCl (silver chloride) is most soluble in a solution that is 0.20 M in  AgNO₃. Option B is correct.

Solubility is the property of a substance to dissolve in a solvent to form a homogeneous solution. It is typically measured as the maximum amount of a solute that can dissolve in a given amount of solvent at a specific temperature and pressure. The solubility of a substance depends on various factors, such as temperature, pressure, solvent, and the presence of other solutes in the solution.

AgCl is sparingly soluble in water, but its solubility can be increased by the presence of common ions such as Ag⁺ from AgNO₃. The addition of Ca₂⁺ or K⁺ ions from CaCl₂ or KNO₃ will not have a significant effect on the solubility of AgCl.

Hence, B. in a solution that is 0.20 M in AgNO₃ is the correct option.

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Aldohexoses have four chiral focuses and, in this way, 24 = 16 isomers. There will be eight d-isomers and eight l-isomers. Thusly, the quantity of enantiomer matches is 8 (2n−1).

An aldohexose has four chiral focuses.

So there are

24=16

optical isomers.

Their perfect representations are the L-aldohexoses, the other 8 of the 16.

Their names are L-allose, L-altrose, L-glucose, and so on.

Consequently, every one of the 16 aldohexoses has its own name.

The four chiral focuses in glucose show there might be upwards of sixteen (24) stereoisomers having this constitution. These would exist as eight diastereomeric sets of enantiomers, and the underlying test was to figure out which of the eight related to glucose. This challenge was acknowledged and met in 1891 by German physicist Emil Fischer. His fruitful exchange of the stereochemical labyrinth introduced by the aldohexoses was a sensible masterpiece, and it is fitting that he got the 1902 Nobel Prize for science for this achievement. At the time Fischer embraced the glucose project laying out the outright setup of an enantiomer was unrealistic. Thusly, Fischer pursued an erratic decision for (D)- glucose and laid out an organization of related aldose setups that he called the D-family. The identical representations of these arrangements were then assigned the L-group of aldoses. To represent utilizing present-day information, Fischer projection formulas and names for the D-aldose family (three to six-carbon atoms) are displayed underneath, with the uneven carbon atoms (chiral focuses) hued red.

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Answer:

15. Flow

16. Volume

Explanation:

That must be the right answer

the correct option is D. between 7 and 14 best describes the pH at the equivalence point of a titration of a weak base with a strong acid.

The pH at the equivalence point of a titration of a weak base with a strong acid is somewhere in the range of 7 and 14. At the equivalence point, the quantity of moles of the base is equivalent to the number of moles of acid added. The pH at the equivalence point depends on the strength of the weak base. On the off chance that the weak base is exceptionally weak, the pH at the equivalence point will be closer to 7.0. If the weak base is stronger, the pH at the equivalence point will be closer to 14.0.

A weak base is a substance that, when dissolved in water, does not break totally into its constituent ions. Weak bases have some other properties, such as their solutions being unfortunate conductors of power. They are also categorized as weak electrolytes. Examples of weak bases incorporate smelling salts (NH3), pyridine (C5H5N), and trimethylamine (N(CH3)3).

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The initial concentration of the HCl solution was 0.1251 M.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl + NaOH → NaCl + H2O

We can use the balanced equation and the volume and concentration of the NaOH solution to calculate the number of moles of NaOH used in the titration:

moles of NaOH = volume of NaOH x concentration of NaOH

moles of NaOH = 0.02746 L x 0.1138 mol/L

moles of NaOH = 0.003127 mols

Since HCl and NaOH react in a 1:1 ratio, the number of moles of HCl used in the titration is also 0.003127 moles.

Now, we can use the number of moles of HCl and the volume of HCl to calculate the initial concentration of HCl:

moles of HCl = concentration of HCl x volume of HCl

0.003127 mol = concentration of HCl x 0.02500 L

concentration of HCl = 0.1251 M

Therefore, the initial concentration of the HCl solution was 0.1251 M.

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The pressure in a region of outer space where there is 1 molecule/cm3 and the temperature is 3 K would be 3.91 x 10^-23 Pa.

In a region of outer space where there is 1 molecule/cm3 and the temperature is 3 K, we can use the ideal gas law to calculate the pressure. However, it is important to note that the ideal gas law assumes that the gas molecules are in constant motion and interact with each other through perfectly elastic collisions, which may not be entirely accurate for outer space conditions.

The ideal gas law is given by:

PV = nRT

where P is the pressure in pascals (Pa), V is the volume in cubic meters (m3), n is the number of moles of gas, R is the gas constant (8.314 J/(mol·K)), and T is the temperature in Kelvin (K).

We are given that there is 1 molecule/cm3 in this region of outer space. This can be converted to the number of moles of gas using Avogadro's number:

1 molecule/cm3 = 1.66 x 10^-24 mol/m3

The volume can be assumed to be very large since we are in outer space, so we can approximate it as infinity (i.e., V = ∞).

Now we can plug in the values:

PV = nRT

P(∞) = (1.66 x 10^-24)(8.314)(3)

P = 3.91 x 10^-23 Pa

Therefore, the pressure in a region of outer space where there is 1 molecule/cm3 and the temperature is 3 K is approximately 3.91 x 10^-23 Pa.

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Answer:

we have a certain amount of Cl2 and want to calculate how much CCl4 we need, we would use the ratio of 1 mole of CCl4 for every 2 moles of Cl2.

Explanation:

The balanced chemical equation for the reaction of CCl4 to Cl2 is:

CCl4 → 2Cl2

From the equation, we can see that for every one molecule of CCl4, two molecules of Cl2 are produced.

This means that the molar ratio of CCl4 to Cl2 is 1:2.

In other words, if we start with one mole of CCl4, we would expect to produce two moles of Cl2. Conversely, if we have a certain amount of Cl2 and want to calculate how much CCl4 we need, we would use the ratio of 1 mole of CCl4 for every 2 moles of Cl2

There are 3.6312 x 10²⁴ atoms in 6 moles of KCIO3 because there are 6 moles of KCIO3 and 6.022 x 10²³ atoms per mole.

Potassium One atom of potassium, three atoms of oxygen, and one atom of chlorine make up the inorganic substance chlorate.

The molar mass of KCIO3 is:

K = 39.10 g/mol

Cl = 35.45 g/mol

I = 126.90 g/mol

O3 = (16.00 x 3) g/mol = 48.00 g/mol

Molar mass of KCIO3 = K + Cl + I + 3O3

= 39.10 + 35.45 + 126.90 + 3(48.00)

= 307.35 g/mol

6 KCIO3 = 6 moles KCIO3

Number of atoms = 6 moles [tex]KCIO3 x 6.022 x 10^23[/tex] atoms/mol

[tex]= 3.6312 x 10^24 atoms[/tex]

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