The value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm is 45°.
What is diffraction?Waves spreading outward around obstructions is known as diffraction. Sound, electromagnetic radiation like light, X-rays, even gamma rays, as well as very tiny moving particles like atoms, neutrons, even electrons that exhibit wavelike qualities all exhibit diffraction.
When a loudspeaker emits sound of different wavelengths or frequencies, the loudspeaker itself functions as an obstruction and casts a shadow to its back, diffusing just the longer bass notes there.
2dsin θ = nλ
substituting all the given values in the above equation, we get
2×d×sin θ = n×λ
2×126 ×sin θ =1× 58.0
θ = 45°
Therefore, the value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm is 45°.
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A sample of an unknown liquid has a mass of 15.19 g, and a volume of 4.69 mL.
What is the density of this liquid?
density = _____ g/cm³
When a sample of an unknown liquid has a mass of 15.19 g and a volume of 4.69 mL, the density of this liquid is 3.238 g/ml.
What is density?Density is the mass of a material substance per unit volume. Density is defined as d = M/V, where d represents density, M is mass, and V is volume. Density is generally measured in grams per cubic centimetre. The density of something describes how compact or dense it is. Let's say you have two boxes, one huge and one tiny. They both, however, weigh the same. That suggests the small box is denser than the large box. The density of something also indicates how dense or packed it is. The density of a volume is the amount of substance contained inside it. A dense thing is heavier than a less dense object of the same size. An item with a density less than that of water will float atop it;
Here,
mass=15.19 gram
volume=4.69 ml
density=15.19/4.69
=3.238 gram/ml
The density of this liquid when sample of an unknown liquid has a mass of 15.19 g, and a volume of 4.69 mL is 3.238 g/ml.
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How many moles of Fe₂O3 are produced when 0.75 mol O₂ reacts with iron?
When 0.75 mol O₂ reacts with iron, it will produce 1.5 moles of Fe₂O3.
What is moles?Moles are small, burrowing mammals found throughout much of the world. They have a cylindrical body, covered in short, velvety fur, and stocky legs. They have a rounded snout and small eyes, and their fur is usually black, brown, or gray. Moles feed mainly on earthworms, insects, and grubs, and use their powerful front paws to dig extensive tunnel systems in gardens and lawns. Moles are solitary creatures, living and foraging alone, and they are active both day and night.
This is because the balanced chemical equation for the reaction is: 2Fe + 3O₂ → Fe₂O₃. Since there is a 2:3 ratio of iron atoms to oxygen atoms, for every 0.75 moles of oxygen, 1.5 moles of Fe₂O₃ will be produced.
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The selection is 1-10 for the question
The number that would be written in front of the water in the formula is 2.85
How to calculate?The mass of the hydrate is 1.55 g,
the mass of the anhydrate (CoCl2) is 1.11 g and
the mass of the water lost is 0.44 g.
We will use the information to calculate the number of moles of each substance present in the hydrate.
1.11 g of CoCl2 is equal to 1.11 g / ( molecular weight of CoCl2) = moles of CoCl2
= 1.11/ 129.839 g/mol
= 0.00854 moles of CoCl2
0.44 g of water is equal to 0.44 g / ( molecular weight of H2O) = moles of water
= 0.44 / 18.015
= 0.0244 moles of water
x = moles of water / moles of CoCl2
x = 2.85
The number that would be written in front of the water in the formula is 2.85
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Small pieces of broken rock, sand, and shells are called _______________.
a. Dirt
b. Sediment
c. Dust
d. Sedimentary Rock
Answer:
b- sediment
Explanation:
the remains of plants and animals are known as sediments. It can be as small as a grain of sand or as large as a boulder. Sediment moves from one place to another through the process of erosion.
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The diagram shows the major divisions of the periodic table. Which of the
following divisions is most likely to contain elements that are malleable and
ductile?
OA. A
OB. B
OC. Both B and C
D. C
Answer:
A is the answer
Explanation:
The elements in Group 1 of the periodic table are the alkali metals. Group 1 metals are shiny, malleable, and ductile. their elemental form and are stored in substances that are unreactive, such as an oil. Each atom of an alkali metal has one electron in its outer energy level
Which of the following sources does not contribute to ozone depletion?
A. Propellants with chlorofluorocarbons
B. Halons used in fire protection
C. Methyl Chloroform in cleaning agents
D. Nitrates used in crop fertilizers
Option (d) is correct. Nitrates used in crop fertilizers does not contribute to ozone depletion.
The Ozone depletion can be defined as the gradual thinning of ozone layer of the earth in the upper atmosphere caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. Ozone layer depletion is a major environmental problem because it increases the amount of ultraviolet radiation that reaches the surface of the earth which increases the rate of skin cancer, eye cataracts and immune system damage. The Ozone depleting substances are chlorofluorocarbons (CFCs), halon, carbon tetrachloride (CCl4), methyl chloroform (CH3CCl3), hydrochlorofluorocarbons (HCFCs), methyl bromide (CH3Br), bromochloromethane (CH2BrCl).
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A 125 g sample of ground beef contains 26.2 grams of protein and 31.5 grams of fat. Assume the ground beef contains only protein, fat, and water.
a. How many grams of water are in the beef sample?
b. Calculate the percentage of fat, by mass, in the ground beef.
c. Calculate the percentage of water, by mass, in the ground beef.
d. Calculate the percentage of protein, by mass, in the sample of beef?
e. How many grams of fat are in a 6.2 oz sample of this beef
There are 67.3 grams of water (a), the percentage of fat is 25.2% (b), the percentage of water is 53.84% (c), the percentage of protein is 20.96%(d), and there are grams of fat 44.22 grams(e).
How many grams of water are there?26.2 + 31.5 = 57.7 - 125 = 67.3 grams of water
What percentage does each nutrient represent?
Knowing the total 125 represents 100%, let's calculate the percentages:
Fat: 31.5 x 100 /125 = 25.2%
Protein: 26.2 x 100 / 125 = 20.96%
Water: 67.3 x 100 / 125 = 53.84%
How many grams of fat are there in a 6.2 oz sample of this beef?6.2 ounces = 175.76 grams (1 ounce = 28.34 grams)
125 = 31.5
175.75 = x
x = 31.5 x 175.5 / 125 = 44.22 fat grams
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19. How do you compare the flexibility of the bioplastic at room temperature and refrigerator temperature?
The bioplastics at room temperature have better flexibility than they have at the refrigerator temperature. The chain mobility of the polymer reduces at lower temperature.
What are bioplastics?Bioplastics are biodegradable polymers. The sugar found in plants is converted into plastic to create bioplastics. In the US, corn is the source of that sugar.
Because of this, bioplastics are more environmentally friendly and renewable than traditional plastics. Currently, a substantial amount of bioplastics are manufactured in two different forms.
They are referred to as polyhydroxyalkanoate (PHA) and polylactide acid (PLA) (PHA). Blair, Nebraska-based Nature Works is the largest PLA manufacturer. These polymer chains are flexible at room temperature however, the chain mobility gets hindered at very lower temperature and their flexibility decreases.
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write a balanced half-reaction for the oxidation of gaseous arsine to aqueous arsenic acid in acidic aqueous solution. be sure to add physical state symbols where appropriate.
The balanced half-reaction for the oxidation of gaseous arsine (AsH3) to aqueous arsenic acid (H3AsO4) in acidic aqueous solution is:
AsH3 (g) + 4H2O (l) → H3AsO4 (aq) + 8H+ (aq) + 8e-The following can be considered the first, second, and third steps of this reaction:(1) The reaction of arsine with water:
AsH3 (g) + 4H2O (l) → H3AsO4 (aq)(2) Balancing the oxygen using hydrogen ions:
AsH3 (g) + 4H2O (l) → H3AsO4 (aq) + 8H+ (aq)(3) Accounting for the number of electrons transferred in the redox reaction:
AsH3 (g) + 4H2O (l) → H3AsO4 (aq) + 8H+ (aq) + 8e-In this reaction, the gaseous arsine (AsH3) acts as the reducing agent, while the water molecules (H2O) and hydrogen ions (H+) in the acidic solution provide the electrons (e-) and protons required for the oxidation to occur. The reaction results in the production of aqueous arsenic acid and hydrogen ions.
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Which of the following best helps explain why the pressure of a sample of CH4(g) (molar mass 16g/mol) is closer to the pressure predicted by the ideal gas law than a sample of NH3(g)(molar mass 17g/mol) ?
Because they are more attracted to one another due to their polar nature, NH3 molecules crash with the container walls with less force than CH4 molecules.
Methane, or CH4, is the non-polar chemical.
The covalent bond holds the CH4 molecules together. The substance is referred to as a covalent compound. Sharing an electron pair results in the formation of the covalent molecule. A polar compound is NH3. The polar covalent link is the NH3, a covalent bond with a net dipole moment.
As a result, while CH4 molecules lack polarity, NH3 molecules do.
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a. write a system of equations that shelby and calvin could use to determine how many milliliters they need to pour from each beaker to make their solution. let a be the amount, in milliliters, of solution from beaker a, and let b be the amount, in milliliters, of solution from beaker b.
To determine how many milliliters Shelby and Calvin need to pour from each beaker to make their solution, they can set up a system of equations as follows:
Let a be the amount, in milliliters, of solution from beaker a, and let b be the amount, in milliliters, of solution from beaker b.
Equation 1: a + b = 5 (This equation states that the total amount of solution poured should equal 5 milliliters)Equation 2: 0.65a + 0.35b = 5 (This equation states that the total amount of acid should equal 5 milliliters, since the solution is 65% acid and 35% water)Solving this system of equations, we get: a = 3.5 milliliters and b = 1.5 milliliters. Therefore, Shelby and Calvin need to pour 3.5 milliliters of solution from beaker a and 1.5 milliliters of solution from beaker b to make their solution.
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The gases in a hair spray can are at a temperature of 27OC and a pressure of 30 lbs/in2. If the gases in the can reach a pressure of 90 lbs/in2, the can will explode. To what temperature in kelvin must the gases be raised in order for the can to explode? Assume constant volume. (1 sig fig for answer)
50 points
Guys I need help ASAPPPP it’s due in 1hour!!!! HELPPPPP
1. I personally prefer to use figure 2 as the easier one to understand, because with such a presentation we can see the difference in each item, it can be seen from the high and low of the chart.
2. To get data in the form of a number of things, it is more efficient to use diagram in figure 1 data.
About diagramA diagram is a two-dimensional visualization which is a representation of data. A diagram that represents or values in an organized manner. Diagrams are usually simple pictures that use lines and symbols to represent data.
Various types of diagrams are simplified and structured visual representations of concepts, ideas, constructs, relationships, statistical data, anatomy, and more. Diagrams can be used for any aspect of human activity to explain or illustrate a topic.
Complex data is usually easier to understand with visual aids. Sometimes, this technique uses three-dimensional visualization which is then projected onto a two-dimensional surface.
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Equal amounts of gases A and B are placed in a closed reactor. A and B react to combine into AB in the following equilibrium reaction:
A + B ⇌⇌ AB
Which are true about this system?
Select two that apply.
In this system, the reactants A and B will react to form the product AB until the system reaches equilibrium.
This means that the rate of the forward reaction will equal the rate of the reverse reaction. Additionally, the equilibrium constant, Kc, can be used to calculate the amount of the products and reactants at equilibrium.
The equilibrium constant, Kc, is used to calculate the relative amounts of products and reactants at equilibrium. It is calculated by taking the product of the concentrations of the products raised to their respective stoichiometric coefficients and dividing it by the product of the concentrations of the reactants raised to their respective stoichiometric coefficients. This equation looks like this:
Kc = (Products)^(Stoichiometric Coefficients) / (Reactants)^(Stoichiometric Coefficients)
For example, if we have the reaction A + B → AB, Kc can be calculated as follows:
Kc = ( [AB] )^1 / ( [A] x [B] )^1This equation states that the equilibrium constant, Kc, is equal to the concentration of AB divided by the product of the concentrations of A and B.
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I need help please!!
The formula of the compound formed from K and P is K₃P. Potassium and oxygen is K₂O and the compound formed from potassium and F is KF.
What are ionic compounds?Ionic compounds are formed between metals and non-metals. Metals donate their valence electron to non-metals. Potassium, K forms the compound with Br as KBr, by donating one electron to bromine. Formula of compound between K and N is K₃N and that between K and S is K₂S
Similarly the table can be filled as follows:
compounds of sodium: Na₃P, Na₂O, NaF, NaBr, Na₃N and Na₂S.
compounds of Mg : Mg₃P₂, MgO, MgF₂, MgBr₂, Mg₃N₂, MgS
compounds of Al : AlP, Al₂O₃, AlF₃, AlBr₃, AlN, Al₂S₃
Compounds of Fe : FeP, FeO, FeF, FeBr, FeN, FeS.
compound of Cu : CuP, CuO, CuF, CuBr, CuN, CuS
and compounds of Ba are: Ba₃P₂, BaO, BaF₂, BaBr₂, Ba₃N₂,BaS
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Give the IUPAC name of the following molecule:
The name of the molecule using IUPAC Organic rules is 2-Methyl-benzen-1-ol.
Is benzene very poisonous?
Because of the way that benzene makes the body's cells behave, poisoning can be fatal. The bone marrow cells' ability to make red blood cells can be affected by exposure to benzene, as can the immune system's white blood cells.
Is benzene illegal in the US?
Toys and other items meant for use in the household are no longer allowed to contain benzene as an ingredient. Benzene smells pleasant, fragrant, and similar to gasoline. Most people can smell benzene in the air between 1.5 and 4.7 ppm.
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which of the following molecules and ions is not tetrahedral in shape? a. ch4 b. so42- c. bh4- d. icl4- e. nh4
Answer:C)
Explanation:
because i got it right
(population projection) the u.s. census bureau projects population based on the following assumptions: - one birth every 7 seconds - one death every 13 seconds - one new immigrant every 45 seconds write a program to display the population for each of the next five years. assume the current population is 312,032,486 and one year has 365 days. hint: in java, if two integers perform division, the result is an integer. the fractional part is truncated. for example, 5 / 4 is 1 (not 1.25) and 10 / 4 is 2 (not 2.5). to get an accurate result with the fractional part, one of the values involved in the division must be a number with a decimal point. for example, 5.0 / 4 is 1.25 and 10 / 4.0 is 2.5. sample run population after 1 year: 3.148125827032967e8 population after 2 years: 3.1759267940659344e8 population after 3 years: 3.2037277610989016e8 population after 4 years: 3.2315287281318676e8 population after 5 years: 3.259329695164835e8 class name: exercise01 11
program to display the population for each of the next five years. Assume the current population is 312,032,486 and a year consists of 365 days:
public class Exercise_11 {
public static void main(String[] strings) {
double birthRateInSeconds = 7.0;
double deathRateInSeconds = 13.0;
double newImmigrantInSeconds = 45.0
double currentPopulation = 312032486;
double secYears = 60 * 60 * 24 * 365;
double numBirths = secondsInYears / birthRateInSeconds;
double numDeaths = secondsInYears / deathRateInSeconds;
double numImmigrants = secondsInYears / newImmigrantInSeconds;
for (int i = 1; i <= 5; i++) {
currentPopulation += numBirths + numImmigrants - numDeaths;
System.out.println("Year " + i + " = " + (int)currentPopulation);
}
}
}
What is population?A population is the entire collection of humans, whether that group is a nation or a group of people who share a feature. A population in statistics is the group of people from which a statistical sample is taken for a research. Population refers to the total number of people who live in a specific place at any one moment.
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i need help on this question look at attachment
The new volume in the graduated cylinder if 14g of iron and 14g of lead is added is 148.37 mL.
How to calculate volume?Volume is a three-dimensional measure of space that comprises a length, a width and a height.
It is measured in units of cubic centimeters in metric, cubic inches or cubic feet in English measurement.
According to this question, a graduated cylinder contains 145mL of water. A 14.0g of iron and 18.0g of lead was added.
volume of iron = 14.0g ÷ 7.86g/cm³ = 1.78cm³volume of lead = 18.0g ÷ 11.3g/cm³ = 1.59cm³This means that the volume of the water in the graduated cylinder will be 145 + 1.59 + 1.78 = 148.37 mL
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which three of the following statements about autotrophs and heterotrophs on earth are true?select 3 correct answer(s)question 6 options:the majority of autotrophs on earth require aerobic respiration in order to survive.heterotrophs are dependent on autotrophs to generate o2 from h2o in order to support aerobic respiration.heterotrophs evolved on earth before autotrophs.heterotrophs depend on autotrophs for conversion of light energy to chemical energy.there are no metabolic differences between autotrophs and heterotrophs.heterotrophs that do not eat autotrophs every day will die in a short time.autotrophs depend on heterotrophs to oxidize sugar and release co2 into the atmosphere.the majority of heterotrophs on earth do not use aerobic respiration as a form of energy conversion.
Below are the three true assertions concerning autotrophs and heterotrophs on earth.
In order to support aerobic respiration, heterotrophs depend on autotrophs to produce O2 from H2O. They also depend on autotrophs to convert light energy to chemical energy. The bulk of Earth's autotrophs need aerobic respiration to survive.
Autotrophic plants use the energy from the sun and uncomplicated substances like carbon dioxide and water to store energy in food (glucose and starch). Instead of getting their energy from other living things, they get it directly from sunshine.
An organism is referred to as a heterotroph if it consumes other plants or animals for food and energy. Its origins are in the Greek words hetero, which means "other," and trophe, which means "nutrition."
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What are the properties of the aluminum in the can? Check all that apply
Answer: If you are looking for the number its 13.
Explanation:
if you can show your question for better understanding
Is the Answer correct if not put actual answer and explain why.
The formula for calcium bromide monohydrate is CaBr2•H2O.
What is formula?A formula is a concise way of expressing a relationship between different variables. It is a mathematical expression that uses symbols and/or numbers to represent different quantities. Formulas can be used to calculate a wide variety of things, from the area of a circle to the amount of force needed to lift a certain weight.
The "•" symbol indicates that the compound contains one water molecule for every two calcium bromide molecules. The "H2O" part of the formula indicates that the compound contains two hydrogen atoms and one oxygen atom.
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Perform each conversion from one metric unit of volume to another.
8.23 mL to dL =
0.0647 cL to nL =
According to unit conversion, conversion of metric units is 8.23 ml= 0.0823 dl and 0.0647 cl= 0.064×10⁷ nl.
What is unit conversion?Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
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Two chemical substances A and B can be touched easily by hands kept on seperate tube but when both the substances are mined in a test tube it cannot be touched due to hotness. What can be reason. behind this?
Answer:
The reason for this is likely an exothermic reaction, where the combination of substances A and B results in a release of heat energy.
Explanation:
An exothermic reaction is a chemical reaction that releases heat energy. This heat can cause an increase in temperature, sometimes to a point where it becomes uncomfortable or even dangerous to touch the mixture. The exact reason why the mixture becomes hot depends on the chemical nature of substances A and B and the reaction they undergo when mixed. Some possible causes could include an increase in the rate of molecular motion as the reaction progresses, or the breaking and formation of chemical bonds, which releases energy in the form of heat. Additionally, the reaction could be releasing gases that are expanding and generating heat as a result. To determine the exact cause, a detailed analysis of the chemical composition and reaction kinetics of the mixture would be required.
the subshell from which an electron would have to be removed to make a cation, and the subshell to which an electron would have to be added to make a anion. helium
The subshell from which an electron would have to be removed to make a cation, and the subshell to which an electron would have to be added to make a anion is the electrons removed in the outermost p orbital to form cations, and the addition of outer shell electrons in group 17 forms anions.
Ionization energy is the energy required to remove the weakest bonded electron by an atom or ion in the gaseous state. The size of the ionization energy is strongly influenced by the distance from the nucleus to the electrons in the outer shell (atomic radius) and the core charge.
Cations are atoms that have lost one or more electrons. The subshell from which electrons must be removed to make cations is the outermost p orbital and then the s orbital. Losing a negatively charged electron will make the atom that was initially neutral become positively charged. While the subshell that gains electrons is called anion. The addition of electrons to the outermost subshell of the atom will give it a negative charge. Group 17 elements add one outer shell electron to form an anion.
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The phase of a substance depends on the relative magnitudes of the molecular _________________ and the energy of intermolecular attractions.
Select the correct answer below:
mass
volume
kinetic energy
pressure
Option (C) is correct. The phase of a substance depends on the relative magnitudes of the molecular Kinetic energy and the energy of intermolecular attractions.
The phase of a substance depends on the balance between the kinetic energy of the individual particles and the intermolecular forces. The kinetic energy keeps the molecules apart and keeps moving around. That is the function of the temperature of the substance and the intermolecular forces try to draw the particles together. The kinetic energy is defined as the energy that possesses due to the motion of an object. This energy is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. An intermolecular force is defined as an attractive force that arises between the positive components of one molecule and the negative components of another molecule.
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You discover that the head of a match contains 1.6x1024 atoms of sulfur S. How many moles of S does a match contain? (Show work please)
The number of mole of sulphur, S the match contain is 2.66 moles
How do I determine the number of mole of S?Avogadro's hypothesis gives a well defined relationship between number of mole and number of atoms. This is given below:
6.02×10²³ atoms = 1 mole of substance
With above information, we can obtain the number of mole is sulphur, S present in the 1.6×10²⁴ atoms of sulphur. Details below:
From Avogadro's hypothesis,
6.02×10²³ atoms = 1 mole of sulphur
Therefore,
1.6×10²⁴ atoms = (1.6×10²⁴ atoms × 1 mole) / 6.02×10²³ atoms
1.6×10²⁴ atoms = 2.66 moles of sulphur
Thus, we can conclude from the above calculation that the number of mole is 2.66 moles
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How does solar energy travel from the solar to the earth.
Answer:
by using glass to reflect to the sun
You find the following reaction at equilibrium. What will happen if you remove some of the solid AgCl?
Ag+ (aq) + Cl- (aq) ⇌ AgCl (s)
If we remove some solid silver chloride the equilibrium will react to decrease the concentration of silver cation.
According to Le Chatelier's Principle, the system at equilibrium will react to a stress placed on the position of the equilibrium in such a way as to minimize this stress. The position of the equilibrium will shift in response to a stress placed on either the reactant or the product side.
Ag+ (aq.) + Cl- (aq.) ⇌ AgCl (s)
Equilibrium is a state of balance between opposing forces or actions that is either static or dynamic. If we remove the salt it will cause the concentration of aqueous silver cations to increase. This will place a stress on the position of the solubility equilibrium. Then the equilibrium will react in such a way as to decrease the concentration of silver cations. We have to shift to the left since the reverse reaction.
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The following data were obtained when a sample of barium chloride hydrate was analyzed as described in the Procedure section. Mass of empty test tube Mass of test tube and hydrate (before heating) Mass of test tube and anhydrous salt (after heating) 18.42 g 20.75 g 20.41 g Calculate (a) the original mass of the hydrate, (b) the mass of water lost upon heating, and (c) the experimental percent water in the hydrate.
The following data were obtained when a sample of barium chloride hydrate was analyzed as described in the Procedure section. Mass of empty test tube Mass of test tube and hydrate (before heating) Mass of test tube and anhydrous salt (after heating) 18.42 g 20.75 g 20.41 g Calculate :
(a) Original mass of the hydrate = mass of test tube and hydrate (before heating) - mass of empty test tube = 20.75 g - 18.42 g = 2.33 g(b) Mass of water lost upon heating = original mass of the hydrate - mass of anhydrous salt = 2.33 g - 20.41 g = -18.08 g(c) Experimental percent water in the hydrate = (mass of water lost upon heating / original mass of the hydrate) * 100% = (-18.08 g / 2.33 g) * 100% = -776.9%Note: The percent water in the hydrate should not be negative, so this calculation must be incorrect.
What is Anhydrous Salt?Important terms in studying hydrated water are as follows: 1. Anhydrous salt is a salt that has lost water molecules, this salt is formed from the decomposition of heated hydrate salts 2. Hydrate salts are salts that have a fixed number of water molecules in each molecule.
Compounds that contain water of crystals are called hydrates, while compounds that do not contain water of crystals are called anhydrous compounds
The word element in Greek is stoicheion, while stoichiometry or stoichiometry has the meaning of measuring elements which include several things, namely atomic mass, molecular mass, empirical formula, molecular formula, concentration, number of moles, reaction equations and everything related to chemical reactions. The number of particles present in a substance in stoichiometry is called moles.
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