The wavelength will be longer the higher the magnitude of the fundamental quantum number to which the electron is hopping. Thus, the longest wavelength is produced by the n = 6 to p = 8 transition.
How would one describe wavelengths?The length of a wave is expressed by its wavelength. The wavelength is the distance between one wave's crest and the following wave's crest. The wavelength can also be determined by measuring from the "trough" (bottom) of one wave to the "trough" of the following wave.
Why is wavelength significant and what is it?The distance that a wave repeats is measured by its wavelength. The letter lambda () stands for these recurrences, also known as wavelengths. Energy travels through a medium as waves (like the atmosphere, the vacuum, or even the ocean).
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What is the mass (in kg) of 6.89 x 1025 molecules of CO2? The molar mass of CO2 is 44.01 g/mol. (Show work on scratch paper) 5.04 kg 6.39 kg 3.85 kg 3.03 kg 2.60 kg
The mass of 6.89 x 10²⁵ molecules of CO₂ will be approximately 0.5068 kg.
To find the mass in kilograms of 6.89 x 10²⁵ molecules of CO₂, you can use the formula:
mass (kg) = (number of moles) x (molar mass in g/mol) / (1000 g/kg)
First, convert the number of molecules to moles by dividing by Avogadro's number (6.02 x 10²³mol⁻¹) :
6.89 x 10²⁵ CO₂ molecules / 6.02 x 10²³mol⁻¹ = 11.46 x 10² mol
Then, use the molar mass of CO₂ (44.01 g/mol) to find the mass in grams: 11.46 x 10²mol x 44.01 g/mol = 506.8 x 10² g
Finally, convert the mass in grams to kilograms by dividing by 1000 g/kg: 506.8 x 10² g / 1000 g/kg = 0.5068 kg
So, the mass of 6.89 x 10²⁵molecules of CO₂ is approximately 0.5068 kg.
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(7) seven importance of chemistry in our everyday life
Answer:
Knowing chemistry can help you make decisions
Answer:
1 ) chemistry plays a role in the manufacturing of medicines
2 ) chemistry plays a role in the production of cosmetics
3 ) chemistry plays a role in the production of soaps and detergents
4 ) chemistry is used to manufacture construction materials
5 ) chemistry allows us to use fuels
6 ) chemistry is important in agriculture ( providing fertilizers ... )
7 ) chemistry is important in textiles
complete this table relating the values of E°cell and δG° to k K E°cel .δG° <1 =1 >1
The relationship between the reaction quotient, electrochemical cell potential, temperature, and standard cell potential is established by the Nernst equation formula. Ecell equals E0 less (RT/nF) lnQ.
What is Nernst equation?The Nernst equation, a chemical thermodynamical relationship, is used in electrochemistry to determine a reaction's reduction potential from the standard electrode potential. The Nernst equation relates an atom's or ion's ability to absorb one or more electrons (reduction potential) measured under any conditions to that measured under standard conditions (standard reduction potentials) of 298 K and one molar or one atmospheric pressure. The relationship between the reaction quotient, electrochemical cell potential, temperature, and standard cell potential is established by the Nernst equation formula. Ecell equals E0 less (RT/nF) lnQ. Under unusual circumstances, the potential of the electrochemical cells can be determined using the Nernst distribution law.
Here,
The solution and the table is in image.
The Nernst equation formula establishes a relationship between the reaction quotient, electrochemical cell potential, temperature, and the standard cell potential. Ecell = E0 – (RT/nF) lnQ.
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Maya made this picture to represent a chemical reaction:
There are two overlapping circles on the left, one white and the other with vertical lines. It is labeled ZX. There is a gray circle labeled Y on the right of ZX. There is a plus sign between ZX and Y. An arrow pointing right is shown on the right of the gray circle labeled Y. Two overlapping circles, one white and the other gray are shown on the right of the arrow and is labeled XY. On the right of XY there is a small circle with vertical lines labeled Z. There is a plus sign between XY and Z.
Which of the following statements best explains the type of chemical reaction represented by Maya's picture? (5 points)
It is neither a synthesis reaction nor a decomposition reaction because the total mass of the products is less than the total mass of the reactants.
It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
It represents a synthesis reaction because the same atoms are present in the reactants and products.
It represents a decomposition reaction because two reactants break apart and form two products.
Answer: It represents a synthesis reaction because the same atoms are present in the reactants and products.
Explanation:
The picture shows two reactants ZX and Y are forming a product XY and another reactant XY forming another product Z. The product and the reactants have the same atoms. This is a characteristic of a synthesis reaction, where two or more reactants combine to form a single product.
I hope this helps :)
To solve this we must be knowing each and every concept related to chemical reaction. Therefore, the correct option is option C among all the given options.
What is chemical reaction?A chemical reaction is a process that converts one or more compounds, known as reactants, into one or more distinct substances, known as products.
Chemical elements and compounds are examples of substances. A chemical reaction reconfigures the component atoms of both the reactants to produce various products.
The illustration portrays two reagents ZX and Y generating a product XY as well as another reactant XY producing a product Z. The atoms in the product as well as the reactants are the same. This is a synthesis reaction feature in which two or even more reactants unite to generate a single product.
Therefore, the correct option is option C.
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the most stable form of nitrogen is n2, where nitrogen atoms are triple bonded together. however, phosphorus and arsenic prefer to form tetrahedral p4 and as4 clusters or long chains/lattices. explain this difference in bonding using periodic trends.
Periodic trends affect bonding, because of how the elements are arranged on the periodic table. Bond forming between two elements depends on electronegativities of the elements.
How can you tell whether two atoms will bond?Their total quantity of valence electrons is what decides whether or not two atoms will join together to create a molecule. The electrons known as valence electrons orbit at the atom's highest possible energy level. The majority of atoms require eight valence electrons to be stable and unreactive.
How may bonds be arranged in ascending polarity?We can determine if a given bond will be non-polar, polar covalent, or ionic using the Electronegativity. The bond is more polar the bigger the difference in electronegativity. The polarity of the following bonds should be in ascending order: H-H, O-H, Cl-H, S-H, and F-H.
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C3H8(g) + 5 O2(g) ---> 3CO2(g) + 4 H2O(g)
What volume of oxygen is required to completely combust 0.452L od propane (C3H8) at STP
Answer: 1.86 L of oxygen is required to completely combust 0.452 L of propane at STP.
Which of the property of base is incorrect?(A) Soapy to touch(B) Good conductors of electricity(C) Liberates heat on dilution(D) All of above
The property of base is soapy to touch. It is good conductors of electricity. It also liberates heat on dilution. So, all the given statements are correct.
We can identify physical as well as chemical properties of bases. Physical properties are those that can be identified by our sense organs. We can touch, see, smell, or feel these physical properties and identify them. The physical properties of bases are: they are bitter in taste; they are soapy or slippery to touch; and they turn red litmus blue.
Meanwhile, the chemical properties of the bases are: they react with acids to form salt and water; they react with metal and liberate hydrogen gas; some conduct electricity but only in aqueous state; they are not very good conductors in solid state; they produce hydroxide ions in solution; and they liberate ions and heat on dilution.
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Choose the correct chemical structure of a dinucleotide composed of AA and GG and the dinucleotide composed of TT and CC in an antiparallel fashion to the previous structure. Take into account the possible hydrogen bonds.
Figure (1) is erroneous because adenine (A) is triple hydrogen bonded to thymine (T), whereas guanine (G) and cytosine (C) are double hydrogen bonds. Figure (2) is valid since both base pairs are arranged correctly.
In nucleic acids, purine bases form hydrogen bonds with pyrimidine bases in a precise way known as base pairing. Adenine forms double hydrogen bonds with thymine. Cytosine forms triple hydrogen bonds with guanine. A dinucleotide is now a nucleotide compound made up of two nucleotides. As a result, each nucleotide unit is made up with one nucleobase, one pentose moiety, as well as phosphoric acid. Nucleotides are organic compounds made up of a nucleoside as well as a phosphate.
They function as monomeric units of a nucleic acid polymers deoxyribonucleic acid (DNA) & ribonucleic acid (RNA), both of which are crucial macromolecules for all life on Earth. Nucleotides are received from meals and are also produced by the liver from common components. Nucleotides are made up of three component molecules: a nucleobase, a sugar with five carbons (ribose or deoxyribose), and just a phosphate group with one to three phosphates. Nucleotides also play an important role in metabolism at the cellular level.
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a drop taken from the top of a mixture of salt and water will jot be identical to a drop taken from the bottom of the mixture
Answer:
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by water molecules, as this diagram shows. Once this happens, the salt is dissolved, resulting in a homogeneous solution.
Explanation:
What is the Celsius temperature of 100.0 g of chlorine gas in a 35.0 L container at 800 mmHg?
a. 159 ∘C
b. 46 ∘C
c. 318 ∘C
d. -114 ∘C
100.0 g liquid chlorine gas at 800 mmHg has a temperature of 46 C in a 35.0 L container.
Chlorine gas toxicity: how toxic is it?Low levels of chlorine exposure (between 1 and 10 ppm) might irritate the eyes, nose, and throat and make you cough and painful. Acute respiratory discomfort with airway constriction that fluid buildup in the lungs can quickly result from breathing in chlorine gas at higher quantities (>15 ppm).
Is chlorine gas safe to breathe?Pulmonary edema, a condition brought on by inhaling a lot of chlorine, is a fluid buildup in the lungs. For a number of hours following chlorine exposure, the onset of pulmonary congestion may be postponed. The skin and eyes may freeze when exposed to compressed liquid chlorine.
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The number of calories needed to raise the temperature of 32 g of water from 12 °C to 54 °C is ___
a. 1.3 cal. b. 1700 cal. c. 0.76 cal.
d. 384 cal
e. 1300 cal
The exact measurement is E. 1300 calories, which is the amount of energy required to raise 32 g of liquid to 12 °C into 54 °C. the range of 12 to 54 °C for 32 g of water.
In 32 gallons of water, how many electrons are there?
Answer and justification We are aware that a substance has 6.022 x 1023 molecules in 1 mole (Avogadro number). Therefore, 10.651023 molecules are present in 32 grams of water. 10.65 10 23 molecular units.
That many calories are required to warm up one gram of water?
hundred calories
The amount of heat required to increase the temperature of one grams (0.001 liters) of fresh water is measured in calories the boiling point of 100 °C.
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The exact measurement is E. 1300 calories, which is the amount of energy required to raise 32 g of liquid to 12 °C into 54 °C.
In 32 gallons of water, how many electrons are there?We are aware that a substance has 6.022 x 1023 molecules in 1 mole (Avogadro number). Therefore, 10.651023 molecules are present in 32 grams of water. 10.65 10 23 molecular units.
That many calories are required to warm up one gram of water?Hundred calories The amount of heat required to increase the temperature of one grams (0.001 liters) of fresh water is measured in calories the boiling point of 100 °C.
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a piece of copper is heated from 25. c to 36.4 c. it absored 325 joules of heat ernergy in this process. determind the mass of the piece of copper. copper has a speicfic heat of 0.387
A chunk of copper with a mass pf 95.4 g will increase in temperature from 25 °C to 48 °C when exposed to 849 J of heat.
What is the relationship between temperature and heat?This formula explains how a substance's ability to absorb heat and its subsequent change in temperature are related to one another. In your case, you are conscious that a sample of iron weighing 95.4 g heats up from 25 to 48 C after absorbing 849 J of heat.
In what ways do copper & oxygen interact?Copper, much like most metallic elements, only reacts with oxygen from the air. When heated, a layer of black copper oxide forms on it: This experiment could be used as an illustration.
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In a reaction mixture containing only reactants, what is the value of Q?
a. -1
b. 1
c.
[infinity]
d. 0
e. It cannot be determined without concentrations
The value of Q in a reaction mixture containing just reactants is 0. Thus, the correct answer is D.
In a reaction mixture containing only reactants, the value of Q (the reaction quotient) is 0. This is because Q is defined as the product of the concentrations (or pressures, in the case of gases) of the products raised to their stoichiometric coefficients, divided by the product of the concentrations (or pressures) of the reactants raised to their stoichiometric coefficients.
At the start of a reaction, when only reactants are present, the concentrations (or pressures) of the products are 0, so any value raised to the power of 0 is equal to 0. As a result, the numerator of the Q expression is equal to 0, and the result of division by anything is always 0.
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ammonia molecules react with water to form a solution that contains ammonium ions and hydroxide ions. how should water be classified in this reaction
In this reaction, the water is considered a base.
When ammonia molecules react with water, they form a solution that contains ammonium ions and hydroxide ion.
In this reaction, water will act as a base.This is because it is accepting hydrogen ions from the ammonia molecules and reacting with them to form a solution that contains both ammonium and hydroxide ions.
This is an example of a neutralization reaction, where an acid and a base react to form a neutral solution.
The water is classified as a reactant, as it is consumed and converted into the product solution.
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arachidonic acid, released during aea hydrolysis, is not a precursor for the synthesis of what class of molecules?
Arachidonic acid is crucial as a precursor for the manufacture of the eicosanoid signalling molecules, and ethanolamine is included as a polar head in the phospholipid phosphatidylethanolamine.
What are the uses of ethanolamines?
A starting material for the production of surfactants, complexing agents, and even medications, ethanolamine also serves as an agent for soften leather and as a "scrubber" to remove dioxide, hydrogen sulphide, and other acidic contaminants from waste gas streams.
What other name would you give ethanolamine?
To distinguish it from ammonia (DEA) and triethanolamine, ethanolamine is frequently referred to as monoethanolamine or MEA (TEA). It serves as a feedstock for the manufacture of medicines, corrosion inhibitors, polishes, detergents, emulsifiers, and chemical intermediates.
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Aluminum reacts with oxygen to produce aluminum oxide. Write an unbalanced formula equation including physical states for the reaction.
Answer:
Al+O2=Al2O
Explanation:
Aluminum is a metal which is part of the group one elements hence given a valence 1 and since gases are known to be diatomic molecules hence the valence 2..
Am just trying am also a student
A tank contains 2.5 moles of gas A, 1.2 moles of gas B and 1.0 moles of gas C. If the total pressure is 0.90 atm, what is the partial pressure of gas B?
Partial pressure of the gas B is 0.23 atm.
What is the partial pressure?Let us note that if there is a mixture of gases that can be found in a particular vessel then we must know that each of the gases that are there would exert its own pressure on the walls of the container.
Now we know that the total number of moles that is present =
2.5 + 1.2 + 1.0 = 4.7 moles. The total pressure of the gases that we have in the system is about 0.9 atm.
We know that;
Partial pressure = Mole fraction * Total pressure
Partial pressure of B is;
1.2/4.7 * 0.9
= 0.23 atm
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how are atoms in a molecule held together? responses through shared electrons through shared electrons through shared neutrons through shared neutrons through shared energy through shared energy through shared protons
A molecule's atoms are held together by shared electrons. This is known as a covalent bond. In a covalent bond, atoms share one or more electrons in order to fill their outermost electron shell, also known as valence shell.
This forms a stable electron configuration and creates a bond between the atoms. The sharing of electrons creates an electrostatic attraction between the positively charged nucleus of one atom and the negatively charged electrons of another atom. This attraction creates the chemical bond that holds the atoms together in a molecule.A neutron is a subatomic particle that is found in the nucleus of an atom. It has no electric charge and a slightly larger mass than a proton.
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In order for light to change a material,what must happen?
In order for lights to change material, it needs to interact with electrons, causing electrons to absorb or release energy, thus causing a change in the material. In simple words, refraction is needed
isopentylamine has two n-h peaks while n-butylacetamide has only one n-h peak. why?
Isopentylamine Hydrochloride. Purity: >98.0%(T). Synonyms: 3-Methylbutan-1-amine
Why it Happens ?Isopropylamine undergoes the same reactions as other simple alkyl amines, such as protonation, alkylation, acylation, and condensation with carbonyls. Isopropylamine, like other simple aliphatic amines, has a low pKa: [(CH3)2)CHNH3]+ has a pKa of 10.63.
Many herbicides and pesticides, including atrazine, bentazon, glyphosate, imazapyr, ametryne, desmetryn, prometryn, pramitol, dipropetryn, propazine, fenamiphos, and iprodione, include isopropylamine as a building block.It is a plastic regulating agent, an intermediary in the organic synthesis of coating materials, plastics, insecticides, rubber chemicals, medicines, and other chemicals, and an additive in the petroleum sector.
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how many types of nonequivalent protons are present in each of the following molecules?
Molecule #1
CH3CH2C=CH
Molecule #2
CH3CH2C(CH3)2CH2CH3
Molecule #3
CH3CH2CH2CH2OCH3
The type of proton in a molecule is referred to as a nuclear magnetic resonance (NMR) active proton. These protons possess a magnetic moment and can be observed in NMR spectroscopy, which is a powerful analytical tool for determining the structure of organic molecules. The chemical shift of the NMR active protons in a molecule depends on their electronic and magnetic environment, which can be used to identify the specific type of proton and the chemical groups it is associated with.
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What is the IUPAC name for this compound? онa. cyclopentanolb. cyclohexanol c. cyclobenzenol d. phenol e. glycerol
The IUPAC name is e. glycerol.
The IUPAC nomenclature is based on naming the longest chain of carbons connected by single bonds in a molecule, whether it is a continuous chain or a ring. All deviations, whether multiple bonds or atoms other than carbon and hydrogen, are denoted by prefixes or suffixes based on a set of priorities. The International Union of Pure and Applied Chemistry (IUPAC) is a global organization that represents chemistry as well as related sciences and technologies. The International Union of Pure and Applied Chemistry is defined as IUPAC. It is the world's leading authority on chemical nomenclature and terminology. Thus, IUPAC nomenclature is essentially a method of naming organic compounds using specific rules.
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What particles does the nucleus of a copper isotope, Cu-62 contain?
There are 29 protons and 33 neutrons in the nucleus of Cu-62.
What are isotopes?
Let us remind ourselves that the number of neutrons that is contained by different atoms of the same element is not the same. Hence, atoms of the same element would have atoms that have the same atomic number but do not have the same number and we call these different atoms the isotopes of the element.
We know that there are different isotopes of copper and they differ in the number of the particles that can be found in the nucleus of each of the isotopes that we have in the compound.
In this case, we have an isotope has been identified as Cu-62. We know that the atomic number of copper is 29 hence there are 29 protons in the nucleus an the number of the neutrons would then be 62 - 29 = 33 neutrons.
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35 ml of a hydrochloric acid solution is titrated with 0.100 m naoh. if it takes 11.22 ml to reach the endpoint of the titration, what was the concentration of the acid solution?
The concentration of the acid solution At the 0 mL =2.79 35 ml of a hydrochloric acid solution is titrated with 0.100 m naoh.
What is the hydrochloric acid used for?Hydrochloric acid (HCl) is commonly used for the neutralization of alkaline agents, as a bleaching agent, in food, textile, metal, and rubber industries. It is neutralized if released into the soil and it rapidly hydrolyzes when exposed to water.
What does hydrochloric acid do to human skin?Skin exposure to low concentrations of hydrogen chloride gas or hydrochloric acid causes erythema and inflammation of the skin whereas high concentrations can cause severe chemical burns to the skin and mucous membranes.
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Each of the following reactions is catalyzed by an enzyme. For each reaction, classify the enzyme according to one of the six main classes suggested by the International Union of Biochemistry.
The first reaction is,
Each of the following reactions is catalyzed by an enzyme. For each reaction, classify the enzyme according to one of the six main classes suggested by the International Union of Biochemistry.
(Image attached to the end of the solution)
in first reaction HYDROLASE enzyme as clearly, it is a hydrolysis reaction
in 2nd reaction OXIDOREDUCTASE is the answer as it is a reduction reaction
Reduction, any of a class of chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased. The electrons taken up by the substance reduced are supplied by another substance, which is thereby oxidized.
REDUCTION can be identified as:
* Removal of oxygen
* Addition of hydrogen
* Decrease in valency of metal ion[tex](e.g.[/tex] [tex]$\mathrm{Fe}+2$[/tex][tex]? $\mathrm{Fe}+3)$[/tex]
and the last one is clearly isomers of each other hence ISOMERASE.
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calculate the ph of the solution upon the addition of 0.015 mol of naoh to the original buffer.
After 0.015 mol of NaOH is added to the original buffer, the solution's pH is 4.8.
What are the answer and an example?A homogenous combination involving two or more materials with particles of less than one nm is referred to as a solution. Solutions come in many forms, including soda water, salt and sugar solutions, and others. Every element in a solution appears as a single wave.
When we know that Ka Equals 1.8 x 10⁻⁵, we may utilize it to calculate Pka.
by using this formula:
Pka = -㏒Ka
= -㏒(1.8 x 10⁻⁵)
= 4.7
Now, after we have got the Pka we need now to get moles of NaC₂H₃O₂ and
Moles of HC₂H₃O₂:
When moles of NaOH = 0.015 moles
When moles NaC₂H₃O₂ after adding NaOH
= initial mol NaC₂H₃O₂ + mol NaOH
∴moles NaC₂H₃O₂ = 0.1 + 0.015 = 0.115 moles
And moles HC₂H₃O₂ after adding NaOH
= initial mol HC2H3O2 - mol NaOH
∴ moles HC2H3O2 = 0.1 - 0.015 = 0.085 moles
So, when we have moles [HC2H3O2] &[NaC2H3O2] so we can substitution its values in [A] &[HA] :
By using H-H equation we can get the PH:
When PH = Pka + ㏒[A]/[HA]
Ph = 4.7 + ㏒0.115/0.085
= 4.8
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The complete question is-
The mass ratio of sodium to fluorine in sodium fluoride is 1. 21:1. A sample of sodium fluorideproduces 28. 8 g of sodium upon decomposition. How much fluorine (in grams) forms?
The premise behind this problem is that if the thermal decomposition also yields 34.5 g of sodium, you must utilise the stated mass ratio to calculate how much fluoride will be produced.
What the body does with sodium?
Sodium is a vital component that the body needs in very tiny amounts to keep bodily fluids in balance, keep nerves and muscles functioning properly, and to prevent excessive perspiration. The majority of Americans consume too much of it, and they might not even be aware of it.
What are sodium's five uses?
5Uses. Titanium, sodamide, sodium cyanide, sodium peroxide, & sodium hydride are all made from sodium. Nuclear reactors have used liquid sodium as a coolant in the past. Streetlights use sodium vapour, which emits a dazzling yellow light.
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What is the empirical formula of the compound: C5H5N5?
Select one:
a.C5H5N5
b.C2H2N2
c.CHN
Answer:
The correct answer is a. C5H5N5
Explanation:
The empirical formula of a compound is the simplest whole number ratio of the atoms of each element in the compound. In this case, the empirical formula of the compound C5H5N5 is C5H5N5, which is the simplest whole number ratio of the atoms of carbon, hydrogen, and nitrogen in the compound.
Question 4 Status: Not yet answered I Points possible: 2.00 Determine the correct answers to the problems below and round to the required number of significant figures. Enter your answer in standard notation. 0.004911/3.87 = 4 x 6 =
The answer is 24, and it does not need to be rounded as it's already in standard notation.
The first problem is 0.004911/3.87 = 0.001268. So the answer should be 0.00127. The second problem is 4 x 6 = 24. Standard notation is a way of writing numbers in a standardized format. It involves writing numbers in a way that includes a number, a decimal point, and a set of digits to the right of the decimal point. The number of digits to the right of the decimal point represents the precision of the number. In scientific notation, numbers are written as a coefficient multiplied by a power of 10.
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If you do a lab that burns Magnesium in pure Oxygen what would the empirical formula of the compound be if you started with 0.6 g Magnesium and 0.4 g of Oxygen?
a. MgO
b. Mg2O2
c. Mg2O3
d. Mg3O2
The empirical formula of the compound is option a.) MgO
The empirical formula of a compound represents the smallest whole number ratio of atoms in a molecule of that compound.
To determine the empirical formula, we need to know the number of moles of each element present in the compound. We can calculate the number of moles by dividing the mass of each element by its molar mass.
Magnesium (Mg) has a molar mass of 24.31 g/mol
Oxygen (O) has a molar mass of 16.00 g/mol
Given that we have 0.6 g of Magnesium and 0.4 g of Oxygen, we can calculate the number of moles of each element as follows:
Magnesium: 0.6 g / 24.31 g/mol = 0.02466 mol
Oxygen: 0.4 g / 16.00 g/mol = 0.025 mol
Now we can find the ratio of atoms of each element in the compound. In order to do that, we divide the number of moles of each element by the smallest number of moles.
Magnesium: 0.02466 mol / 0.02466 mol = 1
Oxygen: 0.025 mol / 0.02466 mol = 1.01
The numbers obtained are not whole numbers, but they are very close to 1, which means the ratio of atoms is close to the ratio of moles, and the empirical formula of the compound is MgO.
Therefore the answer is (a) MgO.
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