Select the answer with the correct number of significant figures for each calculation. (6.022 × 1023) × 2.58 = 1.55 × 1024 1.554 × 1024 1.5537 × 1024

Therefore the concentration of NH3 is 30000mg/L.

What is density?

A material's density specifies the density of that material in a given region. The mass per unit volume of a material is defined as its density. The density of matter is a measurement of how tightly stuff is packed together. It is a specific physical property of anything. The density principle was established by Archimedes, a Greek scientist. Calculating density is simple if you know the formula and understand the units. The symbol denotes density, which can also be represented by the letter D.

Understanding density is critical since it affects many aspects of life. In physics, density is something that affects which clouds float high in the sky and which sink lower. The motions of gases in the atmosphere are determined by density when one material rises over another. It has an impact on what sinks and what floats in a body of water. So, what exactly does density imply? The definition of density is a measure of how dense matter is. Simply put, how much "things" can fit into a given space. The more "stuff" or substance crammed into a place, the denser it becomes.

Calculate the mass of NH3 in household ammonia as follow

[NH3] = weight of NH3 ( Density of water)

[NH3]= 30Kg/[tex]m^{3}[/tex]

[NH3] IN mg/L

Therefore the concentration of NH3 is 30000mg/L.

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The mineral stibnite, antimony(iii) sulfide, is treated with hydrochloric acid to give antimony(iii) chloride and hydrogen sulfide gas. Mass of sbcl3 is produced from a 3.05 g sample of stibnite will be 4.50 g.

Antimony(III) sulfide + hydrochloric acid → antimony(III) chloride and hydrogen sulfide gas.

Sb₂S₃ + HCl → SbCl₃ + H₂S

Sb₂S₃ + 6HCl → 2SbCl₃ +3H₂S

1 mol Sb₂S₃ : 2SbCl₃

Molar mass Sb₂S₃ = 339.715 g/mol

Number of moles = mass in grams / molar mass = 3.35 g / 339.715 g/mol = 0.00986 mol

1 mol Sb₂S₃ / 2 mol SbCl₃ = 0.00986 mol Sb₂S₃ / x

x = 0.01972 mol SbCl₃

Molar mass SbCl₃ = 228.13 g/mol

mass in grams = molar mass × number of moles = 228.13 g/mol × 0.01972 mol = 4.50 g.

In the food, textile, metal, and rubber sectors, hydrogen chloride (HCl) is frequently employed as a bleaching agent to neutralise alkaline substances. When discharged into the soil, it is neutralised, and when it comes into contact with water, it hydrolyzes quickly.

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The law of definite proportions state atoms combine in whole number ratios. Therefore, option B is correct.

According to the rule of definite proportions, every chemical compound has the same elements in the exact same mass quantities.

According to the law of definite proportions, sometimes referred to as the law of constant proportions, each of the constituent components of a chemical compound must always be present in a certain ratio in terms of their mass.

According to the law of definite proportion, the mass ratio of the components in compounds is constant. As an illustration, water from various bodies of water will still have 11% hydrogen and 89% oxygen.

Thus, option B is correct.

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Ch3ho has a concentration (m) of 1.589 mol/dm3 in a solution.

Given our parameters, 230 ml per liter of solution and a mole of solutes equal?

that: mass/molar mass = moles of solutes

mass = 11.7g.

thus the formula for CH3OH's molar mass is C(12)+H(1*3) +O(16)+1 =32g.

11.7g/32g Equals 0.365 moles of solutes.

Great, now that we have the moles, we can now enjoy the molarity (concentration)

Molarity is equal to 0.365mol/230*10-3, which is 0.365mol/0.230L, or 1.589mol/dm3.

The formula for calculating molarity is molarity = number of moles of solute. litres of the solution. Since the volume of the solution will be measured in litres and the quantity of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

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The formula for the ideal-gas percent deviation is: PV = nRT, where R = 0.08206 L.atm/ k.mol = 8.3145 J/K.mol

General gas equation:

[tex]\frac{P_{i} V_{i} }{n_{i} T_{i} }[/tex] = [tex]\frac{P_{f} V_{f} }{n_{f} T_{f} }[/tex]

Density of gas:

р = [tex]\frac{MP}{RT}[/tex]

Any collection of relationships between a single quantity (such as V) and a number of other variables (such as P, T, and n) can be combined into a single statement that encompasses all of the relationships simultaneously. Prior to now, the following three unique expressions were derived:

Boyle’s law

V ∝ 1/P at constant n and T

Charles’s law

V ∝ T at constant n and P

Avogadro’s law

shows V ∝ n at constant T and P

by Combining these three expressions,

V ∝ nT/P

The proportionality constant, also referred to as the gas constant and represented by the letter R, can be written as follows by combining these three expressions:

V = Cons.(nT/P).

Equation becomes V = RnT/P = nRT/P when R is included.

To get rid of the fractions, multiply both sides of the equation by P to get PV = nRT.

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Answer:

2CO2 + 3H2O ---> C2H5OH + 3O2

The working is in the picture.

The process of crenation occurs when the concentration of solute outside the cell is than inside the cell and the solution is said to be hypertonic.

What is crenation?

In botany and zoology, the term "crenation" refers to the round-toothed or scalloped shape of an object, particularly a leaf or shell. Modern Latin crenatus, meaning "scalloped or notched," is derived from common Latin crena, meaning "notch."

The term  can refer to a variety of items, including cells. One process of crenation is the contraction of a cell upon exposure to a hypertonic solution due to the loss of water through osmosis.Cucumber pickling and salt-curing of beef are practical applications of crenation.

Hence, the process of crenation occurs when the concentration of solute outside the cell is than inside the cell and the solution is said to be hypertonic.

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For gram of the chemical that interacted with oxygen, -41.83 KJ of heat were released.

Heat is the exchange in "thermal" energy caused by a temperature difference. Imagine a system that is isolated and has two subsystems that really are initially running at different temperatures. Energy is moved from the lower temperature subsystem 1 to the high thermal subsystem 2.

Because heat is a type of energy, the SI unit for heat also is joules (J), which is defined as the quantity of energy required to elevate the temperature of the a mass m by one degree. This is significant because heat is a kind of energy. To calculate heat, divide the temperature change of a water sample by its mass.

2C6H6 + 15O2 -> 12CO2 + 6H2O

2x49.04 2x10 12x-393.5 6x-285.8

= [12(-393.5)+6(-285.8)] - [2(49.04)+(2x10)]

= -6936.8 -98

= -6534.8 KJ/mole

Per gram of C6H6

= (-6534.8 KJ / 2 mole of C6H6)(1 mole of C6H6 / 78.108g)

= -41.83 KJ / mole

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The empirical formula of this compound CH₂O and the compound is Methanal

The molecular formula of a compound is the simplest integer ratio of the atoms present in the compound.

For the mass of C and H, using molar masses:

12.0 x (0.3664/44.0)  = 0.096g C  

2.02 x (0.15/18) = 0.016g H

As the sample is completely converted into CO₂ and H₂O.

So, 0.25g sample - 0.096g C - 0.016g H = mass of oxygen

Mass of oxygen = 0.138g

Using molar masses:

0.096g / 12.0 g/mol = 0.008 moles C

0.016g / 1.01 g/mol = 0.015 moles H

0.138g / 16.0 g/mol  = 0.008 moles O

0.008 is lesser, so use it to normalize to find the ratio.

The ratios are:

0.008 moles C / 0.008 = 1 moles C

0.015 moles H / 0.008 = 1.8 moles H

0.008 moles O / 0.008 = 1 mole O

Moles of H = 1.8 ≈ 2

This makes the empirical formula as: CH₂O (Methanal)

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In its ground state in the d orbital, manganese possesses a total of five unpaired electrons.

Manganese is a trace mineral that the body contains in very small amounts. The liver, kidneys, pancreas, and bones are where it is most commonly found. In the body, manganese helps to build sex hormones, connective tissue, bones, and blood clotting components. Additionally, it aids in calcium absorption, blood sugar regulation, and the metabolism of fats and carbs. Additionally essential for healthy nerve and brain function is manganese.

Superoxide dismutase (SOD), an antioxidant enzyme that aids in the battle against free radicals, is made up in part of manganese. Free radicals are produced by the body normally, but they can harm DNA and cell membranes. They might contribute to aging and the emergence of several diseases, such as cancer and heart disease.

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Answer:

MgO(s) + 2HCL(aq) --- > MgCl2(s) + H2O(l)

The gallium atom's radius is 181 pm.

The basic cubic structure of a primitive cubic unit cell has one atom in each of the cube's eight corners. In addition, eight additional cubes share each atom evenly, resulting in one atom per unit cell.

A basic cube's edge length (a) and atomic radius (R) are connected by the formula: a = 2*R.

A = 362 pm for the Ga unit cell.

R = a/2 = 362/2 = 181 pm as a result.

As a result, the gallium atom's radius is 181 pm.

Only the corners of the original cubic unit cell contain atoms. Eight adjacent unit cells share each atom at the corner. Both the upper (or lower) layer and the same layer have four unit cells each. Consequently, a specific unit cell only contains 1/8th of an atom.

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Volume of the mineral sample is 30ml.

The buoyant force on a fluid is equal to the weight of the displaced fluid, according to Archimedes' principle. Equation buoyant force = density of fluid x volume of displaced fluid x acceleration due to gravity is used to calculate the buoyant force.

The formula Fb=Vg can be used to calculate the buoyant force. Fb = V g, where Fb is the buoyant force in Newtons, is the fluid density in kilograms per cubic meter, V is the volume of the displaced fluid in cubic meters, and g is the acceleration brought on by gravity.

Volume of mineral sample = 30ml

Volume of mineral sample = [tex]V_{final}[/tex] - [tex]V_{intial}[/tex]

Volume of mineral sample = 180-150

Volume of mineral sample = 30ml.

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Answer:

The correct option is the third statement (a solution with 10% solute and 90% solvent).

Explanation:

Reason for correct answer:

Reason for incorrect answers:

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The volume of 3 mL evaporated unknow liquid is

V 3mL =              1.95                    

                  30.688 X Mass molar

To calculate the volume in liters that 3 ml of your unknown liquid would occupy when vaporized, it can be calculated as follows:

as we know :

first we calculate the temperature of unknown

T = 373 °K / 273°K  

T = 1.37 °K

D = 0.65 g/mL

so,

V 3 mL = volume of unknown liquid X D

                         mass molar X  V  X  T

V 3 mL =     3 mL       X      0.65 g / mL

              mass molar X  22.4 L  X  1.37

V 3mL =              1.95                    

                  30.688 X Mass molar

when we know the value of molar mass, we can easily calculate the value now.

Hence, The volume of 3 mL evaporated unknow liquid is

V 3mL =              1.95                    

                  30.688 X Mass molar

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The Wobble Hypothesis describes how different codons can represent the same amino acid. The less precise base pairings that can form between the third base of the codon and the base at the first position on the anticodon allow one tRNA molecule (with one amino acid attached) to recognize and bind to several codons.

A basic amino group (NH2), an acidic carboxyl group (COOH), and an organic R group (or side chain) that is specific to each amino acid make up an amino acid, an organic molecule.

Alpha-amino carboxylic acid is referred to as an amino acid informally.

An amino and a carboxyl group are both joined to the core carbon (C) atom, known as the -carbon, in every molecule. A hydrogen (H) atom and the R group typically fulfill the remaining two bonds of the -carbon atom.

The building components of proteins are amino acids. The vast majority of chemical processes that take place in cells are catalyzed by proteins. They give cells a lot of their structural components and aid in fusing cells into tissues.

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The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 4.00 mm pathlength cell, is 0.0282.

We'll start by figuring out the compound's molarity, which is determined by dividing the moles of solute by the liters of solution.

M = 0.00140/ 0.5000L = 0.00280M

Then, use the conversion formula 1 cm = 10 mm to convert 4.00 mm to cm.

4.00mm * 1cm/ 10mm = 0.400cm

Finally, we will use the Beer-Lambert equation to get the compound's absorbance.

A = E * b* C

where,

A: absorbance

ε: molar absorptivity

b: length of the light path

C: molar concentration

A = E * b* C

A =  25.2/ M.cm * 0.400cm * 0.00280M

A = 0.0282

The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.0282.

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Increased mass would not change the orbital period because Kepler's third law does not take mass into account.

The cubes of the semi-major axes of the planets' orbits are directly proportional to the squares of the planets' orbital periods. According to Kepler's Third Law, as orbiting planet's radius increases, same the time of its orbit around the Sun.

Thus, we learn that Mercury, the innermost planet, completes its orbit of the Sun in just 88 days. Saturn needs 10,759 days to complete the same task as the earth does in 365 days. Despite the fact that Kepler had no knowledge of gravitation at the time he developed his three laws, Isaac Newton used them to derive his theory of universal gravitation, which explains the mysterious force behind Kepler's Third Law.

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The molecular structures that could be found in a lipid, but not in a carbohydrate, protein, or nucleic acid is a long chain made only of carbon and hydrogen atoms.

Lipids аre hydrophobic (“wаter-feаring”), or insoluble in wаter, becаuse they аre nonpolаr molecules. This is becаuse they аre hydrocаrbons thаt include only nonpolаr cаrbon-cаrbon or cаrbon-hydrogen bonds. Lipids perform mаny different functions in а cells. Cells store energy for long-term use in the form of lipids cаlled fаts.

Lipids аnd cаrbohydrаtes аre composed of cаrbon, hydrogen аnd oxygen аtoms. Proteins аnd nucleic аcids hаve nitrogen аtoms. However, even though lipids аnd cаrbohydrаtes hаve cаrbon, hydrogen аnd oxygen аtoms, cаrbohydrаtes аre mostly cyclic structures аnd not strаight chаin molecules like lipids аnd they do not hаve а long chаin mаde only of cаrbon аnd hydrogen аtoms.

Your question is incomplete, but most probably your full options were

A. a long chain of carbon, oxygen, and nitrogen atoms

B. a long chain made only of carbon and hydrogen atoms

C. a phosphate group joined to a chain of carbon atoms

D. an amino group and a carboxyl group bonded together

Thus, the correct option is B.

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A solution is not a pure substance as it is a mixture between a solute and a solvent.

Pure substances are substances that are made up of only type of particles and have a fixed structure. In pure substances the matter cannot be separated into other kinds of matter by any physical means.

A homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility. The term solution is commonly applied to the liquid state of matter, but solutions of gases and solids are possible.

A solution cannot be a pure substance because it is made up of a homogenous mixture of solute and a solvent. Homogenous means the matter cannot be separated out and therefore a solution cannot be a pure substance.

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The average kinetic energy depends on the mass and speed of the particles. At constant temperature, every gas molecules have the same average kinetic energy.

Kinetic energy is a form of energy generated by virtue of motion of an object. When the object is at rest the energy is stored in the form of potential energy whereas, when they start to move they gain a kinetic energy.

Average kinetic energy of a particle, depends on temperature by the equation :

K =  3/2 KT

Therefore it is independent of mass and speed of the particles. However the speed of ions at constant temperature will be different.

Hence, at constant temperature, the average kinetic energy of all the gases will be the same. Thus, option E is correct.

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Your question is incomplete. But your complete question probably was:

At a constant temperature, which of the gases will have the highest average

kinetic energy?

A) H2

B) N2

C) O2

D) F2

E) All the gases will have the same average

kinetic energy.

The Atoms which is fully occupied by 8 electrons in their outermost shell is said to be full valence shell.

If the atoms have 8 valence electrons in their outermost shell it is said to be compounds are full. this explains the octet rule. The full valence shell means, the valence shell is fully occupied and forms a stable octet. The halogens like Helium, Neon, Argon, Xenon, etc. have fully filled valence shells. Valence electrons are the electrons located at the outermost shell of an atom. full valence shell is the most stable electron configuration. Elements in other groups have partially filled valence shells and gain or lose electrons to achieve a stable electron configuration. Group 0 elements that are helium, neon, argon, krypton, xenon and radon  have full outer shells. atoms are most stable and least reactive  when their outermost electron shell is full.

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For instance, the empirical formula of a hydrocarbon is CH 2, and its M r is 42. Consequently, C 3H 6 is the hydrocarbon's chemical formula.

Finding the mass of C in CO2 and H in H2O is the initial stage in this process. This is accomplished by multiplying by the mass of the compound formed after dividing the atomic mass by the molecular mass. The empirical formula for this hydrocarbon is CH3, as we have a ratio of 1 carbon atom to 3 hydrogen atoms.

A saturated hydrocarbon with one ring has the generic formula CnH2n. For the majority of compounds, details other than the chemical formula are required to clarify their structure. However, a chemical formula's C:H ratio can reveal information about the chemical structure.

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30 ml of hydrogen gas are produced.

The ideal gas law is also known as the general gas equation, is the equation of state for a hypothetical ideal gas. It may have some limitations, but is a good approximation of the behavior of many gases under many conditions. It is expressed as PV = nRT

The reaction is expressed as:

2Al + 6HCl ⇒ 2AlCl₃ + 3H₂

The ratio of Al and H₂ is 2:3

Moles of aluminium = 0.057 /26.98

= 0.0021 moles

The mole ratio indicates that,

The number of moles of H₂ = 0.0021 × 2/3

= 0.0014 moles

Using PV = nRT

where,

T = 273 K

P = 1 atm

R = 0.0821 Kj /mol K

n = 0.0014 moles

Substitute the values in equation which gives,

V = nRT/P

V = 0.0014×0.0821×273/1

V = 0.03 L or 30 ml

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Hello..!

¿What is Cadenas tróficas?

Food chains are chains of living beings that inhabit a certain territory and that comply with the flow of

energy through your diet.

If the length of the cell is constant, a beer-lambert law plot will give a linear relationship between the concentration and the wavelength.

The Beer-Lambert law states that there is a linear relationship between the concentration and absorbance of a solution and that the concentration of a solution can be calculated by measuring its absorbance.

The Beer-Lambert Law is a linear relationship between the absorbance of a solution and its concentration, molar extinction coefficient, and optical coefficient:

                               A = εCL

where A is the absorbance

           ε is the extinction coefficient

           C is the concentration

            L is the length of the cell.

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In the mentioned reaction:

Cu²⁺ + e⁻ → Cu ; Cu²⁺ is reduced

Fe → Fe³⁺ + 3e⁻ ; Fe is oxidized

2l⁻ → l₂ + 2e⁻ ; l⁻ is oxidized

2H⁺ + 2e⁻ → H₂ ; H⁺ is reduced

Oxidation is the process of adding oxygen or electronegative elements or removing hydrogen or electropositive elements. According to the electronic concept, oxidation is defined as the process of losing one or more electrons.

Reduction is the process of adding hydrogen or electropositive elements or removing oxygen or electronegative elements. According to the electron concept, reduction is defined as the process of gaining one or more electrons.

For the given problem,

The oxidation number of Cu²⁺decreased from +2 to 0. thus, it is reduced.

The oxidation number of Fe increased from 0 to +3, it is therefore oxidized.

The oxidation number of l⁻  increased from -1 to 0. It is oxidized.

The oxidation number of H⁺ decreased from +1 to 0. It has been reduced.

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One mole of Pb has the greatest mass and the mass is 207g

We know, that mass = given mole × Molecular weight

According to the given question, we need to find the masses of 1 mole of Na(Sodium), Pb(Lead), Be(Beryllium) and H₂

So,

Mass of Na = 1 × 23 = 23g

Mass of Pb = 1 × 207 = 207g

Mass of Be = 1 × 9 = 9g

Mass of H₂ = 1 × 2 = 2g

Therefore, one mole of Pb (lead) has the greatest mass among the given four elements that are Na, Be and H₂.

The Molar mass of a substance is the mass in grams of one mole of the compound. Pb( lead) is a soft, malleable, ductile and dense metallic element.

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The unknown volume of 8.61 M H2SO4 solution after adding water to make 5.00*102ml of 1.75m H2SO4 was 102 ml, or 1.02 × 102 ml.

1.02x10^2 ml The product of molarity and volume will remain constant as mole solvent is added since molarity is defined as moles per liter. In order to describe this, let's build up an equality: m0*v0 = m1*v1, where m0, v0 are the molarity and volume of the original solution and m1, m1 are those of the final solution.

Calculate by first solving for v0, then substituting the known values: m0*v0 = m1*v1, where v0 = (1.75 M * 500 ml)/8.61 M and V0 = 101.6260163. The result of rounding to three significant figures is 102 ml.

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