The wavelength of the photon produced when an electron in a Bohr model hydrogen atom jumps from the 2nd to the 4th energy level is approximately 1.22 x 10^-7 meters.
To calculate the wavelength of the photon, we need to find the energy difference between the two energy levels and use the formula E = hf, where E is the energy, h is Planck's constant, and f is the frequency.
The energy difference between energy levels in a hydrogen atom is given by the formula: ΔE = 13.6 * (1/n1^2 - 1/n2^2) eV. In our case, n1=2 and n2=4.
Calculating ΔE, we get approximately -3.03 eV. Converting this to joules, we have ΔE ≈ -4.85 x 10^-19 J.
Now, we use the formula E = hf, where h is Planck's constant (6.63 x 10^-34 Js), and the speed of light c = 3 x 10^8 m/s. By substituting the values and solving for the wavelength λ, we get λ ≈ 1.22 x 10^-7 meters.
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How many moles of hcl are required to make 500 ml of a 3.0 mol/l solution of hcl?
Answer:
1.5 moles
Explanation:
To find the number of moles of HCl in 500 mL of a 3 M solution of HCl, we consider moles in 1 liter/ 1000 mL.
3 moles HCl is contained in 1000 mL
x moles is HCl is contained in 500 mL
[tex] = \frac{3 \: \times \: 500}{1000} \: moles \\ = 1.5 \: moles[/tex]
Hence the number of moles of HCl in 500 mL is 1.5 moles.
It takes 38. 6 kj of energy to vaporize 1. 00 mol of ethanol (mw: 46. 07 g/mol). What will be δssys for the vaporization of 11. 0 g of ethanol at 78. 4 °c?
Answer:
9.21 kJ is the enrgy required to vaporize 11.0 grams of ethanol.
Explanation:
Energy of vaporization can be stated as 38.6 kj/mole for ethanol. ["It takes 38. 6 kj of energy to vaporize 1. 00 mol of ethanol"]
11.0 grams of ethanol is not 1 mole. Calculate the moles of ethanol by dividing t=it's mass by its molar mass:
(11.0 grams)/(46.07 g/mole) = 0.2388 moles ethanol
(0.2388 moles ethanol)*(38.6 kj/mole) = 9.21 kJ is the enrgy required to vaporize 11.0 grams of ethanol.
the difference between doing compositional stoichiometry and reaction stoichiometry problems is
The difference between those two is there is a mol or mass ratios of the element in the composition and moll or mass ratio of compounds in the reaction at balanced equations.
What is stoichiometry ?Stoichiometry is an event of chemistry that happen using relationships between products and/or reactants in a certain chemical reaction to find out desired quantitative data. The word of stoichiometry based on Greek language, in Greek, "stoikhein" has a meaning "element" and "μέτρον" read as "metron" means "measure", so, based on its word definition, stoichiometry is a quantify of element.
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What are the limitations to making progress with engineering better batteries what progress have battery Engineers made.
Shorter service life is the limitation to battery system.
Engineers created a new type of battery that weaves two promising battery sub-fields into a single battery.
What progress have battery Engineers made?The battery utilizes both a solid-state electrolyte and an all-silicon anode, manufacturing it a silicon-all-solid-state battery. Lithium-metal, a solid-state battery that is far more well organized than lithium-ion batteries.
Shorter service life is the limitation to battery system. While a flywheel storage device has the same service life as the UPS, batteries generally need to be replaced many times over the same period of time.
New battery technology breakthrough is event rapidly. Advanced new batteries are directly being developed, with some already on the market. The latest generation of grid-scale repository batteries have a higher capacity, a higher efficiency, and are longer lasting life.
So we can conclude that The recent strong progress in the evolution of lithium-ion batteries.
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The volume of water that must be added in order to dilute 40 ml of 9. 0 m hcl to a concentration of 6. 0 m is closest to.
The volume of water that must be add is 20 mL. Volume of water that must add is new volume after dilution minus initial volume.
How to determine the volume that must be add?As per data given:
Initial volume (V1) = 40 mL = 0.040 L
Initial molarity(C1) = 9.0 M
New molarity (C2)= 6.0 M
As we want to know to the new volume of water(V2). We have to use dilution formula where the formula is C1 x V1 = C2 x V2. So, the calculation would be:
9.0 x 0.040 = 6.0 x V2
V2 = 0.06 L
V2 = 60 mL
Since the addition water is the difference between V2 and V1:
Volume add = V2 -V1
Volume add = 60 - 40
Volume add = 20 mL
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Bonds are securities that can be readily bought and sold. A bond issue consists of a number of bonds, usually in denominations of:_______
A bond issue consists of a number of bonds, usually in denominations of $1,000 and $5,000.
What are bonds and securities?The term bond refers to a sort of investment in which an individual loans money to the government or sometimes to the government in return for an interest on the investment. This interest is paid to the individual regularly as a return on his/ her investment.
Hence a bond issue consists of a number of bonds, usually in denominations of $1,000 and $5,000.
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Missing parts;
Bonds are securities that can be readily bought and sold. A bond issue consists of a number of bonds, usually in denominations of ______ or _____ and is sold to many different lenders.
Multiple choice question.
$100; $1,000
$1,000; $10,000
$500; $5,000
$1,000; $5,000
brittleness is a physical property that differs from one kind of material to another. truefalse
It is true that brittleness is a physical property that differs from one kind of material to another.
Physical qualities of a substance are those that can be seen without changing the substance's identity.
If a material splits under stress with low elastic deformation and little to no substantial plastic deformation, it is considered brittle.
Brittleness is a physical property as it alters the shape of the substance but not the identity of substance.
For example - the brittleness of chalk is different than the brittleness of glass. Thus we can say that the brittleness of chalk's material is different than the brittleness of glass's material.
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1. Name each of the following binary compounds or ionic compounds with polyatomic ions.
a) LiBr
b)Cal2
In the electrolysis of water, how long will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA?
In the electrolysis of water, 3490 hour will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA.
What is Ideal Gas Law ?The ideal gas law states that the pressure of gas is directly proportional to the volume and temperature of the gas.
It is expressed as
PV = nRT
where,
P = Pressure
V = Volume in liters
n = number of moles of gas
R = Ideal gas constant
T = Temperature in kelvin
Here,
P = 1.0 atm
V = 165.0 L
R = 0.0821 atm. L/mol.K (Ideal gas constant)
T = 273 K
n = ?
Now put the value in above expression, we get
PV = nRT
1.0 atm × 165.0 L = n × 0.0821 atm. L/mol.K × 273 K
165.0 atm. L = n × 22.4 atm. L/mol
[tex]n = \frac{165.0\ \text{atm. L}}{22.4\ \text{atm. L/mol}}[/tex]
n = 7.36 mol
The reaction is
2H⁺ + 2e⁻ → H₂
1 mol of electrons is produced from 96500 C
So,
[tex]96500 \frac{C}{\text{mol} \times e} \times 2e \times 7.36\ \text{mol}[/tex]
= 1,420,480 C
Convert milliampere to C/s
1mA = 0.001 C/s
113.0 mA = 113.0 × 0.001
= 0.113 c/s
What is relationship between current, charge and time ?The relation between current, charge and time is expressed as:
[tex]I = \frac{Q}{t}[/tex]
where,
I = Current
Q = Charge in Coulomb
t = time
Now put the value in above formula we get
[tex]I = \frac{Q}{t}[/tex]
[tex]= \frac{1,420,480\ C}{0.113\ C/s}[/tex]
= 12,570,619.469 s
= 3490 hour
Thus from the above conclusion we can say that In the electrolysis of water, 3490 hour will it take to produce 165.0 L of H2 at 1.0 atm and 273 K using an electrolytic cell through which the current is 113.0 mA.
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The pOH of a solution is 10.75. What is the concentration of OH– ions in the solution?
Use StartBracket upper O upper H superscript minus EndBracket equals 10 superscript negative p O H.
The hydroxide ion concentration in the solution is 1.788 × 10⁻¹¹ M. The amount of any ion present in a solution is typically represented in moles per liter as ionic concentration.
What is meant by ionic concentration?An indicator of an environment's ion concentration is an environment's ionic strength. Ions are formed from ionic chemicals when they dissolve in water. Significant aspects like the dissociation constant or the solubility of various salts will be impacted by the total concentration of electrolytes in the solution. Normal brain processes depend on the maintenance of ion concentration homeostasis, and variations in this state can cause a variety of pathological disorders, including seizures.
The equation to calculate pOH of the solution is
pOH = - log[OH⁻]
Given:
pOH = 10.75
Hence, 10.75 = - log[OH⁻]
[OH⁻] = [tex]10^{-10.75}[/tex] = 1.788 × 10⁻¹¹ M
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The complete question is:
The pOH of a solution is 10.75. What is the concentration of OH ions in the solution?
Use [OH-10 POH
3.162 x 10-108 M
1.778 x 10-11 M
1.075 x 102 M
5.623 x 1010 M
It is always feasible that a substance will dissolve in water when:
A. Enthalpy is negative and entropy is positive.
B. Enthalpy is negative and entropy is negative.
C. Enthalpy is positive and entropy is positive.
HELP PLEASE 15 points
The free energy is always negative and the dissolution is feasible when enthalpy is negative and entropy is positive. Option A
What is dissolution of a substance in water?Water is known as the universal solvent. Water is a polar substance hence it is often used to dissolve polar substances. It has a dipole and being that there is a high degree of electronegativity difference between the oxygen and the hydrogen atoms in water, it is feasible that the degree of hydrogen bonding between the two is high.
We know that dissolution is favored when there will be an increase in entropy as a result of that, that is; if more particles will appear. Now we know that ΔG = ΔH - TΔS.
Given the equation above, it then follows that the free energy is always negative and the dissolution is feasible when enthalpy is negative and entropy is positive. Option A
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What is the digestive tract called?
The digestive tract called gastrointestinal tract..
The digestive tract is a channel that receives food, then digests and absorbs the food nutrients through parts of the organs in the digestive system. The food that has been digested and absorbed is then expelled through the anus.
The digestive tract consists of the oral cavity, esophagus, stomach, small intestine, large intestine, rectum and anus. That is why this tract is called the gastrointestinal tract because it extends from the mouth to the anus. There are two digestive processes in the digestive tract, namely mechanical digestion and chemical digestion. Mechanical digestion is digestion that breaks down large foods into small ones through the digestive organs. While chemical digestion is the digestion of complex organic molecular materials into simple ones with the help of enzymes.
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The pictures represent three different states of matter.
Which order of pictures places molecules with the
most amount of motion to the least amount of motion?
OX-Y-Z
OZ Y-X
OY-Z-X
OY X-Z
Answer:
OX-Y-Z
Explanation:
its the correct answer
The correct order from the most amount of motion( Kinetic energy) to the least amount of motion is Y (gas), Z (liquid), and X (ice). The correct answer is C, Y-Z-X.
In the given sequence, the states of matter with the most amount of motion (kinetic energy) to the least amount of motion are as follows:
Y - Gas (highest kinetic energy, molecules move freely and quickly in all directions)
Z - Liquid (intermediate kinetic energy, molecules have some freedom of movement but are more closely packed than in a gas)
X - Ice (lowest kinetic energy, molecules are tightly packed and have minimal movement, as it is in a solid state)
This sequence reflects the increasing freedom of movement and mobility of molecules as they transition from a solid to a liquid to a gas state.
Thus, the correct option is C.
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What is the formula for lowest in Excel?
The formula in Excel to verify the lowest value of your data range, is with the MIN function.
Its syntax is as follows: MIN (number1, [number2], ...) number1, [number2], ... is the series of values from which you want to obtain a minimum.
The MIN function can be used to find the smallest value in a column or in a group of cells. This function is especially useful for finding the minimum value in a data set that contains numeric values. Additionally, it can also be used to find the minimum of other types of values such as dates, times, and text.
The MIN function can be used to find the minimum value in a column as well as in a row. This means that it can be used to find the minimum value in an entire data table. It is also possible to find the minimum value in a specific subquery.
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Chemistry! Photo is attached below… :)
Based on the equation of the reaction;
a) The oxidation states of each of the atoms in the compounds are given below:
Pb = 0PbO₂: Pb = +4; O = -2H₂SO₄: H = +1; S = +6; = -2PbSO₄: Pb = +2; S = +6; O = -2H₂O: H = +1; O = -2(b) The atom that gets oxidized is Pb and the atom that gets reduced is Pb in PbO₂
(c) The reactant that is the oxidizing agent is PbO₂ and the reactant that is the reducing agent is Pb.
What are oxidizing and reducing agents?An oxidizing agent is a substance that causes oxidation by accepting electrons from another substance in a redox reaction whereas, a reducing agent is a substance that causes reduction by losing electrons to another substance in a redox reaction,
In redox reactions, oxidizing agents are reduced while the reducing agents are oxidized.
A gain or loss of electrons results in a change in the oxidation states of elements.
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Write the chemical formula for magnesium nitrate hexahydrate
Answer: Mg(NO₃)₂ * 6 H₂O
Explanation:
How many moles of water are
in 1.23x10¹8 water molecules?
[ ? ]×10[?]
Answer:
2.04 x 10⁻⁶ moles H₂O
Explanation:
To find the moles H₂O, you need to multiply the given value by Avogadro's Number. This number is a ratio between molecules and moles, thus granting you the way to convert between both units. It is important to arrange the ratio in a way that allows for the cancellation of units. The final answer should have 3 sig figs to match the sig figs of the given value (1.23 x 10¹⁸ molecules).
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
1.23 x 10¹⁸ molecules H₂O 1 mole
--------------------------------------- x ------------------------------------- =
6.022 x 10²³ molecules
= 2.04 x 10⁻⁶ moles H₂O
A ____________ is a planar, six-membered ring used to represent the cyclic form of glucose and other sugars.
Answer:
Haworth projection (14.3)
please give me brainliest
the group numbers for carbon oxygen, nitrogen and sulpher.
Answer:
Carbon: 14
Oxygen: 16
Nitrogen: 15
Sulpher: 16
According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 690 kJ of energy
3.00 ×10² g of HF.
What is thermochemical equation?A Thermochemical Equation is a balanced stoichiometric chemical equation that includes the enthalpy change, ΔH. In variable form, a thermochemical equation would look like this:
A + B → C. ΔH = (±) #
The thermochemical reaction is of two types:
Endothermic Reaction Those thermochemical reactions in which heat is absorbed. Change in enthalpy for this reaction is positive.
Exothermic Reaction Exothermic reactions are the reaction in which the heat or the energy is evolved during the reaction.
SiO2 + 4 HF(g) → SiF4(g) + 2 H20(l) ΔH®rxn=-184 kJ
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according to the following (unbalanced) reaction:
Fe(s) + Cl₂ (g) → FeCl3 (s)
How many grams of iron(III) chloride (FeCl3) result when 15.5 g of iron (Fe) is reacted with an excess of chlorine gas? Balance the equation first.
When 15.5 g of iron (Fe) is reacted with an excess of chlorine gas, it will produce approximately 44.97 g of iron(III) chloride (FeCl₃) based on the balanced equation.
To balance the equation, we need to ensure that the number of atoms of each element is equal on both sides. In the unbalanced equation:
Fe(s) + Cl₂ (g) → FeCl₃ (s)
We have one iron atom on the left side and one iron atom on the right side. So, the iron is already balanced. However, we have two chlorine atoms on the left side and three chlorine atoms on the right side. To balance the chlorine, we need to place a coefficient of 3 in front of the Cl₂ on the left side:
Fe(s) + 3Cl₂ (g) → FeCl₃ (s)
Now that the equation is balanced, we can calculate the number of grams of iron(III) chloride (FeCl₃) formed when 15.5 g of iron (Fe) reacts. From the balanced equation, we can see that the molar ratio between iron and iron(III) chloride is 1:1. Therefore, the molar mass of iron(III) chloride is relevant for this calculation.
The molar mass of Fe is approximately 55.845 g/mol, and the molar mass of FeCl₃ is approximately 162.204 g/mol (55.845 g/mol for Fe + 3 * 35.453 g/mol for Cl). We can use these molar masses to convert the mass of iron to moles and then calculate the mass of iron(III) chloride produced.
Number of moles of Fe = 15.5 g / 55.845 g/mol = 0.2776 mol
Since the molar ratio between Fe and FeCl₃ is 1:1, the number of moles of FeCl₃ produced is also 0.2776 mol.
Mass of FeCl₃ = 0.2776 mol * 162.204 g/mol = 44.97 g
Therefore, 15.5 g of iron will result in approximately 44.97 g of iron(III) chloride when reacted with an excess of chlorine gas.
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Identify the negative radicals in the following substances:
i. table salt (NaCl)
ii. baking soda (NaHCO,)
iii. washing soda (Na₂CO₂)
iv. lime water (Ca(OH)₂)
The negative radicals will be [tex]Cl^-[/tex], [tex]HCO^-[/tex], [tex]CO_3^2^-[/tex], and [tex]OH^-[/tex] respectively.
What are negative radicals?They are the species that are negatively charged in ion forms.
[tex]NaCl --- > Na^+ + Cl^-[/tex]
[tex]NaHCO --- > Na^+ + HCO^-[/tex]
[tex]Na_2CO_3 --- > 2Na^+ + CO_3^2^-[/tex]
[tex]Ca(OH)_2 -- > Ca^2^+ + 2OH^-[/tex]
Thus, the negative radicals in each of the chemicals are [tex]Cl^-[/tex], [tex]HCO^-[/tex], [tex]CO_3^2^-[/tex], and [tex]OH^-[/tex] respectively.
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The negative radicals as as follows;
NaCl - Cl^-NaHCO3 - HCO3^-Na₂CO3 - CO3^2-Ca(OH)₂ - OH^-What are negative radicals?The negative radicals are the radicals that are negatively charged. Every ionic compound is composed of positively and negatively charged ions.
Let us now identify the negative radicals in the following ionic compounds;
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4. Are these forces balanced or unbalanced? What is the net force on the car? Explain.
Answer:
The net force is zero
Explanation:
Newton's Third law states that every action/ force has an equal but opposite reaction, if the car pushing on the ground, the ground is pushing on the car.
The water pressure on Mustafa as he dives is increasing at a rate of 0.9920.9920, point, 992 atmospheres (\text{atm})(atm)left parenthesis, start text, a, t, m, end text, right parenthesis per meter (\text{m})(m)left parenthesis, start text, m, end text, right parenthesis . What is the rate of increase in water pressure in atm/km
Based on the given scenario, the rate of increase in water pressure in atm/km is known to be 992 atm/km.
What is water pressure?Pressure is known to be that kind of force that is known to often pushes water via pipes.
Note that Water pressure is a tool that is often used to know or identify the flow of water from any given tap. The amount of pressure at one's tap is said to be often dependent on how high the service tank or water tower is above one's home.
Therefore since 1 atm/m = 1000 atm/km
Hence 0.992 atm/m :
= 0.992 x 1000
= 992 atm/km.
Therefore, Based on the given scenario, the rate of increase in water pressure in atm/km is known to be 992 atm/km.
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‼️PLEASE HELP ASAP, DUE TODAY, GIVING BRAINLIEST‼️
The five elements of chemical change include colour change, precipitate or gas formation, odour change, temperature change, and gas or precipitate formation.
How do I determine which indication to employ?When choosing an indicator for acid-base titrations, pick one whose pH range is compatible with the reaction's pH change. As an illustration, the pH quickly rises from 3 to 11 when a strong acid and base are titrated.
An indication in a chemical process is what?Chemical indicator: Any substance that can be used to detect the presence or absence of a chemical species at a threshold concentration in a solution, such as an acid or an alkali, usually by changing colour. Methyl yellow is a good illustration of this.
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Given the following reactants, finish and balance the reaction:
Ca(s) + HCl(aq) -->
A. Ca + 2 HCl --> CaCl2 + H2
B. 2 Ca + 2 HCl --> 2 CaCl + H2
C. Ca + HCl --> CaCl + H
D. Ca + 2 HCl --> CaCl2 + 2H
The products of the reactants with the balanced chemical equation are:
3 Ca + 2 HCl → 3 CaCl₂ + H₂.
What is the chemical equation?A chemical equation involves reactants, products produced, and an arrow to show the direction of the reaction.
The chemical equation of the reaction in which the number of atoms of each element is the same on both sides of the equation is known as a balanced chemical equation.
The law of conservation of matter needed to be obeyed by a chemical equation. The total mass of all elements on the reactant side will be equal to the total mass of all elements on the product side in the balanced chemical equation.
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How many moles of aluminum (Al) are reacted to produce 23.7 grams of copper?
Answer:
0.248 moles of aluminum (Al) are reacted to produce 23.7 grams of copper.
Please help, Chemistry
The number of mole of Ag formed from the reaction of 8.0 moles of AgNO₃ and 5.0 moles of Zn, given the chemical reaction is 8 moles
How do I determine the number of mole of Ag formed?To know the number of mole of Ag formed, we'll begin by obtaining the limiting reactant. Details below:
2AgNO₃ + Zn -> 2Ag + Zn(NO₃)₂
From the balanced equation above,
2 moles of AgNO₃ reacted with 1 mole of Zn
Therefore,
8 moles of AgNO₃ will react with = (8 × 1) / 2 = 4 moles of Zn
From the above calculation, 8 moles of AgNO₃ requires only 4 moles out of 5 moles of Zn given. Thus, AgNO₃ is the limiting reactant
Finally, we shall determine the number of moles of Ag formed. This is shown below:
From the balanced equation above,
2 moles of AgNO₃ reacted to produce 2 moles of Ag
Therefore,
8 moles of AgNO₃ will also react to produce 8 moles of Ag
In conclusion, we can say that the number of mole of Ag formed is 8 moles
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what addition information is needed to convert an empirical formula calculation into a molecular formula calculation?
The additional information that needed to convert empirical formula calculation into molecular formula are percentage of the elements in the compound; molar mass; and molecular mass.
What is empirical formula?The empirical formula is the chemical formula of a compound which inform the proportions or rations of the elements present in the compound but it is not represent the actual numbers or arrangement of atoms. In short, empirical formula is the smallest possible number that element present in the formula. Empiric formula can be use to determine the molecular formula calculation because it is contain an information about number of atom of each element present in the formula.
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What Is the amount of a particular substance in a given quantity of a mixture; substances move from high to low?
The amount of a particular substance in a given quantity of a mixture is the concentration.
Substances move from high concentration to low concentration.
What is the amount of a substance?The amount of a particular substance in a given quantity of a mixture is known as the concentration of that substance.
The amount of solute in a specific amount of solution is how concentrated a material is.
The concentration of a substance can be expressed as molar concentration or mass concentration.
Molarity, or the number of moles of solute in one liter of solution, is the standard unit of concentration expression.
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