The decreasing order of the given elements according to their decreasing electronegativity from most to least electronegative is nitrogen, sulfur, chromium, and lithium.
Electronegativity of an atom is the tendency of an atom to participate in a covalent, which attracts the bonding electrons. As we move across a period, electronegativity is increased and it is going to decrease as we move down the group.
The nitrogen is present at extreme right of the table in the lithium period. The electronegativity value of nitrogen is higher, then of sulphur, then chromium and at the final the least value is of lithium. Hence, the decreasing order of electronegativity is nitrogen, sulfur, chromium, and lithium.
Therefore, the decreasing order of the given elements according to their decreasing electronegativity from most to least electronegative is nitrogen, sulfur, chromium, and lithium.
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1. SiH4 what is the covalent compounds
Answer: Silicon tetrahydride (silane) is a covalent compound where a central silicon (Si) atom is covalently bonded to 4 terminal hydrogen (H) atoms.
Explanation:
What are the products of the acid hydrolysis of an ester?
The products of the acid hydrolysis of ester are carboxylic acid and alcohol.
Acid hydrolysis of estersAcid hydrolysis of esters involves heating esters in a large excess of water in the presence of a strong acid catalyst. The products of such reactions are carboxylic acid and alcohol as shown in the below example.
[tex]CH_3COO(CH_2)_3CH_3 + H_2O --- > C_4H_9OH + CH_3CO_2H[/tex]
Acid hydrolysis of esters is the reverse of the esterification process. During ester formation or esterification, carboxylic acids and alcohols react to produce ester and water as follows:
[tex]C_4H_9OH + CH_3CO_2H-- > CH_3COO(CH_2)_3CH_3 + H_2O[/tex]
Thus, acid hydrolysis of esters is a reversible reaction that does not go into completion ordinarily.
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A rectangular swimming pool is 8 ft deep. One side of the pool is 4,5 times longer than the other. The amount of water needed to fill the swimming pool is 5184 cubic feet. Find the dimensions of the pool
The smaller dimension of the pool is ft and the larger dimension is tt
The dimension of the pool is Width = 13.5 ft , depth = 8 ft , length = 60.75 ft .
The volume expression is given as :
V = L × W × D
where ,
L = length = 4.5 times Width
W = width = ?
D = depth = 8 ft
V = volume = 5184
5184 = 6 × W × 4.5W
5184 = 27 W²
W² = 5184 / 27
W² = 192
W = 13.8 ft
therefore, A rectangular swimming pool is 8 ft deep. One side of the pool is 4,5 times longer than the other. The amount of water needed to fill the swimming pool is 5184 cubic feet the dimensions are Width = 13.5 ft , depth = 8 ft, length = 60.75 ft.
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What i the binding energy for the nuclide 199F (atomic ma: 18. 9984 amu) in MeV per nucleu?
if you binding energy for thr nuclide 199F in Mev per nucleu the result is 7.78MeV.
What is energy?
energy is ability to do the work . Sicientist define energy as the ability to do the work. mordencivilizwtion is possible because people to learn how to energy form one form to another and then do the work.
Mass defect
=[{9×1.0078)+(10×1.0087)}−18.9984]mu
=0.1588mu
Binding energy per nucleon
=(0.1588×931)Mev/19
7.78 MeV`
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A trend relating the melting point of a transition metal in Periods 4 and 5 to the number of electrons each atom has? Explain
The melting point of transition elements increases up to d 5 and then drops over time as the atomic number rises.
What is transition element ?
Transitional elements are those that have their d orbitals only partially filled. According to IUPAC, a transition element is an element with a partially full d subshell of electrons or an element with a partially filled d orbital that can form stable cations.
As was previously discovered, the higher the metal's melting temperature, the more delocalized electrons there are and the smaller the atom's radius. The number of delocalized electrons per metal atom rises as we cross period 3, and the radius of the elements decreases. This implies that the melting point rises.
Thus,The melting point of transition elements increases up to d 5 and then drops over time as the atomic number rises.
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Design a concept map that compares and contrasts the atomic ideas proposed by Democritus and John Dalton.
The atomic theories of Dalton and Democritus does converge in a common idea of the indivisibility of the atom.
What is the atomic theory?We know that the atomic theory is the description of the atom from diverse perspectives. Actually, we begin the idea of the atomic theory from the would of Democritus. In the time of Democritus, there were no empirica laboratories hence, he had to make do with the theoretical approaches to the idea of the atom. He put forward the idea of the indivisibility of the atom.
This idea of the indivisibility of the atom became a resonating theme in the study of the atom from the time of Democritus down to the time of John Dalton. According to the Dalton Atomic theory, the atom is indivisible and the atoms of an element can be able to combine with the atoms of other elements in small simple ratios.
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sif5 lewis structure
The central silicon atom expands the octet because it is bonded with 9 electrons, and the Lewis structure of SiF₅ reveals that there are 5 single bonds and no double bonds in the compound.
Silicon Penta Fluoride: What is it?Fluoride in silicon pentoxide SiF₅ is a covalent compound created when silicon and fluorine share electrons. The 14th element, silicon, has four valence electrons. So, in order to reach octet, it needs 4 more electrons.
The 17th element, fluorine, has seven valence electrons. So, to reach an octet, one electron is required. Each F shares one of its valence electrons with silicon, giving silicon more electrons than an octet by receiving nine. Each of the five bonds is a single bond.
The charge on the main atom is created by the one extra pair of electrons. The compound thus does not follow the octet rule.
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Identify the characteristic: When a dog is too hot, he will sweat through his paws and pant to cool himself down.
Homeostasis
Made of cells
Share similar chemicals
Reproduce
btw this is science
The dog would cool down by the process of Homeostasis.
What is Homeostasis?We can define Homeostasis as the control of the internal environment. We know that the body does have systems that have the job of self regulation. These parts of the body are able to increase or decrease the secretion of certain chemical substances.
Now if we have a dog that is sweating, this is a response to the fact that the dog is too hot and it has caused several of the systems in the body to work together to cool the dog down by the process of homeostasis.
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Vicky and omar have an unknown oxide. They mix it with water to form a solution then add universal indicator. The colour changes to orange. Which type of oxide do they have?.
Vicky and Omar mix the unknown oxide with water and then add universal indicator to the solution. The color changes to orange then, the oxide formed must be a weak acid.
Indicator
The substance that indicates visibly the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution by typically through a color change is known as an indicator. The last point is demonstrated by a physical modification of the reaction or by the addition of an extra reagent, both of which are referred to as indicators.
Thus, they mix it with water and then add universal indicator to the solution. The color changes to orange the oxide formed must be a weak acid.
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Which of the following substances is used to preserve foods?
A) sodium nitrite
B) biguanides
C) potassium hydroxide
D) chlorophyll
XeF3+
a. Lewis structure?
b. geometry?
c. hybrid bonds used?
d. formal charge on each atom?
e. a bond angle between a surrounding atom, the central atom and another surrounding atom?
f.)polar? nonpolar? or NA
The process of two complementary single-stranded DNA and/or RNA molecules joining together to generate a double-stranded molecule is known as hybridization in the context of genomics. The proper base pairing between the two single-stranded molecules is necessary for the bonding.Sp3 hybridization is the process of hybridization in which the 1s and 3p orbitals of the same element are mixed and recast to create new hybrid orbitals with the same energy, symmetry, and fixed orientation in space. An example is the creation of the methane molecule.
Linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral are the five fundamental hybridization shapes.
To find the formal charge of a Lewis structure, count the number of electrons "owned" by each atom. Count all lone pairs and half of the bond electrons. The difference between the number of valence electrons in an atom and the number it has is the formal charge. Fluorine (and all halogens) tend to form bonds and have three unshared pairs of electrons. None of these atoms have a formal charge in their electronic configuration.
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Tablets taken by patients suffering from anaemia contain 0. 2 g of iron sulphate (feso4). Calculate the mass of iron in each tablet to 2 decimal places.
Each iron tablet contains 152 g of iron.
The substance listed here is iron sulfate, and its chemical formula is FeSO4.
The compound's relative formula mass is calculated by multiplying the atomic masses of its constituent parts, and it is then given in grams.
The atomic mass of Fe = 55.845
The atomic mass of S = 32.065
The atomic mass of O = 15.994
So;
Relative formula mass is calculated as 55.845 + 32.065 + 4(15.994) = 151.886g
Therefore, the solution is 152g
A particle's or object's mass, a dimensionless quantity, is used to represent how much matter is there (symbolized m). The kilogram is the chosen unit of mass according to the International System (SI) (kg).
In physics, mass is a way to quantify inertia, a fundamental property of all matter.
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Lidia plans an experimental investigation to see how the thickness of a lens affects the point where a beam of light is focused. She plans to shine light through a lens and measure the distance to a screen that is placed where the beam focuses.
What are the controls in Lidia’s investigation?
The controls in this set-up would be the position of the lens in relation to the light beam and the distance of the lens from the screen because Lidia intends to measure the location where the light beam is focused. This is so that only the thickness of the lens needs to be changed, not the position.
The controls in Lidia’s investigation:
1) The thickness of the lens is the independent variable because the investigation's goal is to ascertain how one variable influences another.
In order to determine the effect on the dependent variable afterward, Lidia must experiment with a variety of thicknesses.
2) Because the goal of the investigation is to ascertain how a light beam is focused, this point is the dependent variable. As a result, she has no control over this point and will instead only monitor and measure how it responds to changes in the independent variable.
Lidia must confirm that no other factors are influencing the outcomes or output before drawing a decision.
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what is an acidic oxide
Explanation: An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid. Examples include SO2, CO2, SO3, Cl2O7, P2O5, and N2O5.
Answer:
An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid.[1] Acidic oxides will typically have a low pKa and may be inorganic or organic.
the element silver has an atomic mass of 108 u and consists of two stable isotopes silver-107 and silver-109.
Silver-109 has a mass of 109 amu. It is one of the isotopes of the silver atm.
What are isotopes?The term isotopes has to do with the atoms of the same element that has the same atomic number but different mass numbers. This implies that the isotopes that we have do have the same number of protons but they do not have the same number of neutrons and the fact that they differ in the number of neutrons implies that would have the same chemical property.
We can see from the question that there are two isotopes of silver and tehse isotopes of silver have been identified as silver-107 and silver-109. The isotopes do have the same mass and not the same number of protons.
The percentage abundance of the two isotopes are not the same which means that one is more than the other. We can now see that the mass of the silver 109 in amu is 109 amu.
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The equation [H+] = 10-pH gives
If the pH of a solution is known, the equation [H⁺] = [tex]10^{-pH}[/tex] gives hydrogen ion concentration of a substance.
What is the pH of a solution?The pH of a solution is a measurement that described the acidity or basicity of a substance.
The pH of a substance is defined as the negative logarithm of the hydrogen ion concentration of a substance.
Mathematically;
pH = - log [H⁺]
where;
[H⁺] is the hydrogen ion concentration of the substance.
The pH values of a substance range from 0 to 14.
Neutral substances have a pH of 7 while acidic substances have a pH of less than 7 with acidity increasing as the pH values decrease to 0.
Basic or alkaline substances have a pH greater than 7 with basicity increasing as pH values increase to 14.
The hydrogen ion concentration of a solution ca be determined if the pH of the solution is known using the formula:
[H⁺] = [tex]10^{-pH}[/tex]
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Give formulas corresponding to the following names: (a) Potassium tris(oxalato)chromate(lli) (b) Tris(ethylenediamine) cobalt(III) pentacyanoiodomanganate(Il) (c) Diamminediaquabromochloroaluminum nitrate
To solve the given problems, there are some rules for naming these compounds in coordination chemistry.
What is the nomenclature for naming coordination compounds?Cation is always named before anion.The amount of ligands of a certain type is a numerical prefix.We name the ligands in the complex ion before the metal ion, in alphabetically sequence.the oxidation state of metal ion is denoted by roman numerals in parenthesis For the anion complex, the metal name's ending is replaced with -ate.Molecular names are most frequently seen in neutral ligands, whereas anionic ligands remove the -ide & add -o to the root name.Some other rules for writing formula-
Cation and anion charges are balanced by one another.Outside of the brackets, we write the counterions.Now, as per the given questions we can write the formulas-
a) [tex]K_{3}[Cr(C_{2}O_{4})_{3}][/tex]
b) [tex][Co(en)_{3}]_{4} [Mn(CN)_{5}I]_{3}[/tex]
c) [tex][Al(H_{2}O) _{2}(NH_{3}) _{2}BrCl]NO_{3}[/tex]
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The molar mass of c7h16 and the molar mass of caco3 contain approximately the same number of.
The molar mass of C₇H₁₆ and the molar mass of CaCO₃ contain approximately the same number of grams per mol (g/mol).
What is a molar mass in chemistry?The mass of a specific chemical ingredient or chemical agent (g) multiplied by the quantity of stuff is known as the molar mass (mol). By multiplying the standard atomic weights (in g/mol) of component atoms, one can identify the molar density of a compound.
How does chemistry use molar mass?The molar mass of an active ingredient is determined by dividing its mass by the quantity of that compound, expressed as the number of molecules in the sample, quantified in moles. The molar mass of a solid is a bulk attribute rather than a molecular one.
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gold has a face-centered cubic unit cell. how many atoms of au are present in each unit cell? express your answer as an integer.
There are 3 Au atoms are present in each unit cell.
The crystal structure of gold is face-centered cubic. Its unit cell or basic repeating unit, contains four gold atoms, indicating that the gold atoms are in contact along the diagonal. The crystal structure of gold is a close-packed face-centered cube Imagine a cube with a gold atom at each corner and at the center of each face.
Gold is a chemical element with 79 protons in each nucleus. All atoms with 79 protons are gold atoms, and all gold atoms behave similarly chemically. So, in principle, you only need 79 protons to make gold. A face-centered cubic unit cell also starts with identical particles at the eight corners of the cube.
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the delocalized π cloud of benzene is located
Additionally, each of these p orbitals has the potential to simultaneously overlap with other p orbitals on both sides, creating a delocalized pi-electron cloud that extends above and below the plane of the entire ring.
What is orbital delocalization?
Any link in which the electrons have more than two nuclei to choose from is said to be delocalized.
The electrons in the bond are restricted to the space between the two carbon atoms in a molecule like ethylene. We refer to the electrons as being localized.
What do you mean by pi orbital delocalization?
Delocalization of the pi electrons offers the molecule additional stability by endowing the entire ring with partial double bond characteristics.
This additional stability is what distinguished aromatic compounds from other cyclic aliphatic compounds.
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Part B
Enter the anticodons corresponding to the codons on the mRNA (from part A). Show the nucleic acid sequence as triplets and
label the 5' and the 3' ends.
Separate triplets with dashes. For example: 5'GGG-AUA3'.
The sequence:
3’GCT|TTT|CAA|AAA’5
The anticodons corresponding to the codons on the mRNA (from part A) is 5' CGA - AAA - GUU 3'.
What are anticodons?Anticodons are nucleotide sequences on tRNA molecules that are complementary to the codons found on mRNA molecules.
The anticodons on tRNA molecules determine the amino acid that is carried by the tRNA.
Just like codons, anticodons occur in triplets of nucleotide sequences.
Considering the codons on the mRNA molecule:
3’ GCT | TTT | CAA | AAA ’5
The complementary anticodon will be:
5' CGA - AAA - GUU 3'
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a rectangular garden measures 34ft by 45ft. surrounding (and bordering) the garden is a path 4ft wide. find the area of this path. be sure to include the correct unit in your answer.
Area is defined as the total space taken up by a flat (2-D) surface or shape of an object.
What is this rectangular?A quadrilateral with four equal vertices and parallel sides is known as a rectangle. As a result, it is also known as an equiangular quadrilateral. Rectangles can also be referred to as parallelograms because their opposing sides are equal and parallel. A laptop has four sides, two of which are parallel to one another and are of equal length. This means that a laptop is a well-known example of a rectangle-shaped object in everyday life. The shape of a keyboard and a monitor's screen is also rectangular. A quadrilateral with all of its angles being equal, or right angles, is a rectangle.Area = length x breadthArea = l × b. Area = π × radius × radiusArea = π × r2(π = 3.14) Using these formulas, area for different quadrilaterals
A = L x W where A equals area, L equals length, and W equals width.
area of yard = 34 x 45 = 1530 square feet
walk is 4 feet wide
34-4 =30, 45-4 = 41
30*41=1230
1530-1230=300
area of walk is 300 square feet
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True or false: the ability of carbon atoms to bond to each other results in just one type of organic compound.
Answer:
Im assuming true but don't quote me on that.
As interest rates change, bond investors are actually subject to two sources of offsetting risk. On the one hand, when rates rise, bond prices fall, which reduces the value of the portfolio. On the other hand, reinvested coupon income will compound more rapidly at those higher rates. This reinvestment rate risk will offset the impact of price risk
The cost of bonds and interest rates are inversely related. This implies that as interest rates increase, bond prices decrease, and when interest rates decrease, bond prices increase.
A rise in the current rates for new debt instruments might result in investment losses, which is what interest rate risk refers to. For instance, if interest rates increase, a bond's or another fixed-income investment's value in the secondary market will decrease. The length of a bond refers to how much its price changes when interest rates vary.
Reinvestment rate risk is the possibility that an investor would need to reinvest future cash flows at a reduced rate of return as a result of falling interest rates. Reinvestment rate risk is typically linked to fixed-income investments, especially callable bonds.
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Which pair of elements will form a covalent bond?hydrogen and chlorinesodium and chlorinecopper and brominezinc and bromine.
Chlorine and hydrogen will form covalent bond.
What is covalent bond?
An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or shared pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive forces between atoms when they share electrons. Each atom in many molecules can reach the equivalent of a complete valence shell thanks to the sharing of electrons, which results in a stable electronic configuration. Covalent bonds are much more frequent than ionic bonds in organic chemistry. Numerous other types of interactions fall under the category of covalent bonding, such as bent bonds, three-center two-electron bonds, agostic interactions, metal-to-metal bonds, and three-center four-electron bonds.
Chlorine and hydrogen Non-metals can connect covalently with one another.
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a chemist adds of a zinc oxalate solution to a reaction flask. calculate the micromoles of zinc oxalate the chemist has added to the flask. be sure your answer has the correct number of significant digits.
The micromoles of zinc oxalate the chemist has added to the flask is 10^-6 moles.
calculation:-
A chemist adds 155.0 mL of a 1.69 X 10^-5 M zinc oxalate (ZnC2O4) solution to a reaction flask.
The relation between molarity and moles and volume is
Molarity = Moles / Volume (L)
Volume = 155 mL =0.155 L
1.69 X 10^-5 M = moles / 0.155 L
Moles = 1.69 X 10^-5 M X 0.155 L = 0.26195 X 10^-5 moles
Moles = 2.6195 X 10^-6 moles = 2.6195 micromoles
1 micro mole = 10^-6 moles.
Pyrolyzed zinc oxalate is used to obtain zinc oxide sunscreen. Zinc oxalate is used in the metalworking industry and in pharmaceutical applications. Release agents such as zinc oxalate have antiseptic properties and the ability to kill bacteria. Zinc fluoride is water soluble and readily dissolves in alcohol and acetone. Also, it is soluble in ammonium hydroxide alkali hydrochloric acid and nitric acid.
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Use the drop-down menus to describe the charges of the subatomic particles. Protons have a charge. Have a 0 charge. Electrons have a charge.
The magnitude of the charges of the subatomic particles of an atom are:
Proton have a +1 charge.
Neutron have a 0 charge.
Electrons have a -1 charge.
An atom is the smallest, indivisible unit made up of matter and forms all chemical elements. Thus, atoms are typically the fundamental building blocks of matter, which also determines the structure of all chemical elements.
In Chemistry, an atom consists of three (3) distinct particles and these include;
Protons: these are the positively charged subatomic particles found in the nucleus of a chemical element and they have a magnitude of +1.
Neutrons: these are the neutral subatomic particles found in the nucleus of a chemical element and they have a magnitude of 0.
Electrons: these are the negatively charged subatomic particles found outside the nucleus of a chemical element with a magnitude of -1.
In conclusion, we can deduce the following about the subatomic particles of an atom;
Proton have a +1 charge because it positively charged.
Neutron have a 0 charge because it is neutral and has no charge.
Electrons have a -1 charge because it is negatively charged.
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A certain brand of canned soup contains 2.26g NaCl in a single-cup serving. what is the molarity of NaCl in the soup? (Note: 4 c = 0.946 L.)
The molarity of the solution is 0.0597 M.
What is the molarity?We know that the molarity has to do with the number of moles of the substances that is found in a given volume of solution. Thus the term molarity has to do with the amount of substance that is present.
We have that;
Mass of the sodium chloride = 2.26g
Molar mass of the sodium chloride = 40 g/mol
Volume of the solution = 0.946 L
Number of moles = 2.26g/ 40 g/mol
= 0.0565 moles
Molarity = 0.0565 moles/0.946 L
= 0.0597 M
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the malate dehydrogenase reaction has a strongly positive standard free energy change but it proceeds in the direction of oxaloacetate because the concentration of is maintained at exceedingly low levels.
Oxaloacetate concentration is maintained at exceedingly low levels.
What is a malate dehydrogenase?
Malate dehydrogenase (MDH) is a key protein in the main oxidative pathway and is a widely distributed enzyme in living things. Using NAD+ and NADP+ as a cofactor, it catalyses the conversion between malate as well as oxaloacetate. Malate dehydrogenase (MDH), a crucial enzyme inside the tricarboxylic acid cycle (TCA), performs crucial metabolic functions in the pathways that produce aerobic energy as well as in the malate shuttle.
The malate dehydrogenase reaction seems to have a strongly positive gibbs free energy change, but also because the density of oxaloacetate is kept at extremely low levels, it proceeds inside the direction of oxaloacetate.
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Molar mass practice (IMAGE) GIVING 80 POINTS!!!!
Molar mass of H₂O₂ or hydrogen peroxide obtained by summing the masses of each atom in the compound is 34.014 g/mol.
What is molar mass?Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.
The molecular mass and formula mass are used as synonym for the molar mass.It has units of gram/mole.Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.
Molar mass of hydrogen peroxide is obtained as, (1.008×2)+(15.999×2)=34.014 g/mol.
Thus, the molar mass of hydrogen peroxide is 34.014 g/mol.
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