化學
化學反應、化學計量、分子結構與元素性質。
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13.atom a: 11 protons, 12 neutrons, 11 electrons atom b: 11 protons, 14…
Atomic number: Same (11 for both). Mass number: Different (23 for Atom A, 25 for Atom B). Classification: Same element (sodium) as they have the same atomic number.
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why is water a great solvent? ○ it has more oxygens that hydrogens ○ it…
it is capable of dissolving more substances than any other liquid
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clear all elements in the same group have similar chemical properties. …
Elements in the same group have similar chemical properties.
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water molecules are connected to other water molecules by _____________…
B. hydrogen
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why is water considered a polar molecule? it has unequal sharing of ele…
It has unequal sharing of electrons (H's are positive, O's are negative)
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15. which of the following explains why atoms of the same element can h…
They have different numbers of neutrons
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the bonds within water are the most missed questions on the exam. pleas…
B. covalent
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13. determine the periodic trends best represents the general trend of …
It increases as you move down a group.
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10. a sample of copper contains 69.2% of cu - 63 (62.929 amu) and 30.8%…
$63.64$ amu
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7. determine which of the following statements correctly compares cesiu…
Cs has a larger atomic radius and lower ionization energy and lower electronegativity.
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anatomy of an atom the basic model what are atoms made of? scientists h…
1. The nucleus 2. Subatomic particles 3. Protons and neutrons 4. Neutrons 5. Electrons 6. Negatively - charged particles that orbit the nucleus in a "cloud" at nearly the speed of…
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3. the average atomic mass is a average of the isotopes of an element, …
weighted - average; abundances
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anatomy of an atom the basic model what is located at the center of an …
1. Protons and neutrons 2. Neutrons 3. Electrons 4. Negatively - charged subatomic particles that orbit the nucleus 5. A tabular display of the chemical elements, organized by ato…
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constructing an evidence - based argument use the scaffold below to cri…
Investigation Question: Is our Sun releasing energy due to chemical or nuclear reactions? Best - supported claim: The Sun is releasing energy due to the process of nuclear fusion …
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practice: isotope calculations #2 1. complete the following table nucle…
1. | Nuclear Notation | Atom or Ion? | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons | |---|---|---|---|---|---|---| | $^{24}_{11}Na$ | Atom | 11 | 24 | 11 | 1…
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what of the following best describes soil liquefaction? a when saturate…
A. when saturated soil behaves like a liquid
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what is the atomic mass number equal to? what is the atomic number equa…
1. The sum of protons and neutrons. 2. The number of protons. 3. An atom of an element with the same number of protons but different number of neutrons. 4. A tabular display of ch…
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constructing an evidence - based argument use the scaffold below to cri…
The Sun is releasing energy due to nuclear reactions. The evidence includes the Sun's long - term energy output, core conditions (high temperature and pressure), its mass, and spe…
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04 question (1 point) write the chemical equation describing the comple…
$2C_8H_{18}(l)+25O_2(g) ightarrow16CO_2(g)+18H_2O(g)$
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part 3 (1 point) remember that chemists typically do not include a coef…
1; 3; 1; 6
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when balancing a chemical equation, which of the following is/are permi…
Part 1: B. placing a coefficient in front of a formula Part 2: A. O B. F C. H
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44. ripening is the process of bananas ripening a chemical change or a …
- 44. Es un cambio químico. - 45. Es un cambio físico.
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part 1 (1 point) in a balanced chemical equation, does the number of mo…
Part 1: no Part 2: 3 Part 3: 2
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a ____________ speeds up a chemical reaction. enzymes are an example of…
B. Catalyst
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1. fill in the blank: fat is made up of _, molecules that are all diffe…
1. fatty - acid 2. unsaturated 3. Fried snacks (e.g., French fries), baked goods (e.g., cookies), some margarines 4. partially hydrogenated oil
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43. classify each as a physical change or a chemical change. a. breakin…
a. Cambio físico b. Cambio físico c. Cambio químico d. Cambio químico e. Cambio químico
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why does increasing the speed of molecules increase reaction rate? mole…
C. Molecules move faster, increasing both the chance and energy of collisions.
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how does increasing temperature generally increase reaction rate? at hi…
At higher temperatures, a greater proportion of particles have the sufficient energy, aka the activation energy, $E_a$, necessary for a successful collision.
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the amount of energy necessary to move from reactants to the transition…
C. Activation energy
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which curve on the energy diagram shows the reaction that ran slower? s…
Solid gray curve, because it has a higher activation energy
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reactants will successfully move forward in the reaction when... they c…
they collide with the proper orientation and sufficient energy.
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42. label each set of diagrams in figure 23 as a physical or a chemical…
No se puede determinar la respuesta sin ver la Figura 23. Se necesitan los diagramas para clasificar cada conjunto como un cambio físico o químico.
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b. identify the type of reaction as synthesis, decomposition, single - …
1. Double - replacement 2. Single - replacement 3. Double - replacement 4. Single - replacement 5. Synthesis
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a. classify the following reaction as synthesis, decomposition, single …
1. Double - replacement reaction 2. Decomposition reaction 3. Double - replacement reaction 4. Single - replacement reaction 5. Combustion reaction
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40. boiling water at what temperature would 250 ml of water boil? 1000 …
# Explicación detallada: ## Paso 1: Punto de ebullición del agua A presión atmosférica normal (1 atm), el agua hierve a 100 °C independientemente del volumen. Entonces, tanto 250 …
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7 • • • → • • • single replacementdisplac 8 • • → • • 9 caco₃ → cao + c…
8. Synthesis 9. Decomposition 10. Double - replacement 11. Single - replacement 12. Synthesis 13. Neutralization (Double - replacement) 14. Decomposition 15. Single - replacement
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types of chemical reactions identify the type of chemical reaction (syn…
1. Single displacement 2. Double displacement 3. Decomposition 4. Synthesis 5. Decomposition 6. Double displacement 7. Single displacement
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question 1 1 pts the half - life of a radioisotope is 104.3 years. how …
$2.63$
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13. 2 s + fe₂o₃ → fe + so₂
$2S + 2Fe_2O_3 ightarrow4Fe + 3SO_2$ (coefficients are 2, 2, 4, 3)
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13. s + fe₃o₄ → fe + so₂
2, 1, 3, 2
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19. in the measurements below, the significant digits are underlined. d…
a. Non - zero digits (4, 2) and trailing zero after decimal are significant. b. Non - zero digits (2, 1) are significant, trailing zeros are not. c. Non - zero digits (5, 1) and t…
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37. classify each as a solid, a liquid, or a gas at room temperature. a…
37. a. Líquido b. Gas c. Sólido d. Gas e. Sólido f. Sólido 38. a. Propiedad física b. Propiedad física c. Propiedad química d. Propiedad física e. Propiedad química f. Propiedad f…
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lab questions 1. record your results. (c - 10 marks) | metals | kcl | f…
Cu + KCl → NR Cu + Fe(NO₃)₂ → NR Cu + CaCl₂ → NR Cu + Na₂CO₃ → NR Cu + HCl → NR Zn + KCl → NR Zn + Fe(NO₃)₂→Zn(NO₃)₂ + Fe Zn + CaCl₂ → NR Zn + Na₂CO₃ → NR
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6. (\text{li}_{3}\text{po}_{4}\to\text{li}+\text{p}+\text{o}_{2}) 7. (\…
6. 4, 12, 4, 8 7. 1, 5, 5, 1 8. 4, 3, 2, 6
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13. s + fe₂o₃ → fe + so₃ 14. cu₂o + c → cu + co₂
13. \(1S + 1Fe_2O_3 ightarrow2Fe + 1SO_3\) 14. \(2Cu_2O+1C ightarrow4Cu + 1CO_2\)
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4 cocl₆ 8. identify the coefficient above 9. identify the subscript abo…
8. 4 9. 6 10. 1, 2, 1, 1 11. 2, 1, 2 12. 8, 16, 1
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how many stable isotopes does silver have? 3 2 1 rewatch submit
B. 2
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15. what is the mass number equal to? number of protons plus number of …
Number of protons plus number of neutrons
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what is different about different isotopes? atomic numbers mass numbers…
B. mass numbers
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what is different between the two isotopes of silver? number of protons…
number of neutrons
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what particles are added together to determine the relative atomic mass…
C. protons, D. neutrons
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name: jeremiah watson periodic table study guide fill out the chart: | …
S: chalcogen Ga: boron - group element (triels) Sb: pnictogen
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7. order the following from the smallest atomic radii to the largest. e…
He, $Co^{2+}$, $Fe^{2+}$, $Cl^-$
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14. why does he say the atomic number is like \the soul of the atom\? b…
Because it doesn't change, and determines what kind of atom it is.
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6. is the radius of a cl- ion equal, greater, or less than a neon atom?…
The radius of a $Cl^-$ ion is greater than a neon atom.
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multiple - choice question 13. what is the atomic number equal to? numb…
Number of protons in the nucleus
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a proton is added to carbon? nitrogen a proton is removed from carbon b…
Carbon Carbon $C^-$ $C^+$
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12. which subatomic particle can jump from atom to atom? electrons prot…
Electrons
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here are three isotopes of an element: ₆¹²c ₆¹³c ₆¹⁴c the element is th…
The element is carbon The number 6 refers to the atomic number The numbers 12, 13, and 14 refer to the mass number First isotope: 6 protons and 6 neutrons Second isotope: 6 proton…
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11. how many letters can the symbol for an element be? 1 or 2 only 2 on…
1 or 2
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10. what determines what element an atom is - its very identity? number…
Number of protons
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anwar al - sadat and menachem begin won the nobel peace prize in 1978 f…
D. signing the Camp David Accords.
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lab questions 1. record your results. (c - 10 marks) |metals|kcl|fe(no₃…
1. Results table (completed with NR for no reaction as per above analysis): | Metals | KCl | $Fe(NO_3)_2$ | $CaCl_2$ | $Na_2CO_3$ | HCl | | ---- | ---- | ---- | ---- | ---- | ----…
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multiple - choice question 6. what is the nucleus? the outside of the a…
The center of the atom
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sort the events in the order in which they occurred, beginning with the…
1. Greek philosopher Democritus introduces the concept of uncuttable matter that he calls atomos. 2. John Dalton concludes that compounds are made of combined particles and reintr…
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which statement is part of daltons atomic theory? select all that apply…
B. Atoms of the same element have the same characteristics. C. All substances are made of atoms.
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by using the terms from the answer bank to fill in the blanks. answer b…
1. Daoist alchemists, prolonged life 2. fireworks, warfare 3. Chinese, Mongols, Eurasia
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10. neon has two isotopes: neon - 10 and neon - 12. a. which isotope ha…
a. neon - 12 b. neon - 12 c. Neither, they have the same number of protons. d. Neither, they have the same number of electrons.
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which of these is a postulate of kinetic molecular theory? a the kineti…
A. The kinetic energy of gas molecules depends on temperature.
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match the vocabulary word to its definition. smallest unit of an elemen…
1. smallest unit of an element - b. atom 2. a subatomic particle with a negative charge - c. electron 3. center of an atom - a. nucleus
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being hungry after a long day at calvert hall a student arrives home an…
1. Chemical Change; Evidence: Browning and flavor development during baking (Maillard reaction), burning and turning black. 2. Chemical Change; Evidence: Breakdown by stomach acid…
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which subatomic particles contribute the most to the mass of an atom? e…
Protons and neutrons
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complete the orbital diagram for the following neutral element: antimon…
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓ 3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4p: ↑↓ ↑↓ ↑↓ 5s: ↑↓ 4d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 5p: ↑ ↑ ↑ 6s: 4f: 5d: 6p:
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part 2. in the box to the right. construct the lewis dot structure of t…
Draw the symbol of the element (let's assume it's Sn, tin, which has this electron - configuration in its neutral state). Place 4 dots around the symbol, one on each of the four s…
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what term refers to the unique number of protons in an elements nucleus…
B. Atomic number
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what is the name for a substance made up of only one kind of atom? mixt…
C. Element
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assignment balanced equation: has the same number introduction to balan…
1
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what is the name for a substance made up of only one kind of atom? mixt…
C. Element
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the molecule shown in the figure is a(n) ... polysaccharide. saturated …
unsaturated fatty acid
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question 1 how many glucose molecules (c6h12o6) are in 9.00 g of glucos…
$3.011\times 10^{22}$ glucose molecules
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the energy derived from the digestion of food is ____________. a. kinet…
D. chemical energy
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students created diagrams to demonstrate collisions between gas molecul…
A. Diagram A: gas molecule collisions are in random motion and perfectly elastic
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name______ periodic table packet #1 period______ directions: use your p…
1. Ag 2. 200.59 3. Nickel 4. Chlorine (Cl) 5. Fe, Cu (answers may vary) 6. Group 11 7. He, Ne (answers may vary) 8. F, Cl (answers may vary) 9. W 10. 63.55 11. Kr 12. Atomic Numbe…
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assuming 50% efficiency, 150 kcals of chemical energy would result in _…
B. 75 kcals
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part 1: unit quiz 2a - electronic structure complete the table below by…
| ELEMENT SYMBOL | TOTAL NUMBER OF ELECTRONS | ELECTRON CONFIGURATION | NUMBER OF VALENCE ELECTRONS | LEWIS DOT STRUCTURE | | ---- | ---- | ---- | ---- | ---- | | Al | 13 | \(1s^{…
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1. are the following ionic compounds soluble or insoluble in water? bas…
a. Soluble, strong electrolyte b. Insoluble, weak electrolyte c. Insoluble, weak electrolyte d. Insoluble, weak electrolyte e. Slightly soluble, strong electrolyte f. Insoluble, w…
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name: date: period: version b part 1 unit quiz 2a - electronic structur…
| ELEMENT SYMBOL | TOTAL NUMBER OF ELECTRONS | ELECTRON CONFIGURATION | NUMBER OF VALENCE ELECTRONS | LEWIS DOT STRUCTURE | |---|---|---|---|---| | Al | 13 | $1s^{2}2s^{2}2p^{6}3s…
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question 23 water molecules are able to form hydrogen bonds with ... co…
E. compounds that have polar covalent bonds
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question 21 what is the maximum number of covalent bonds an element wit…
B. 2
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question 20 2 pts the atomic number of sulfur is 16, which indicates th…
16 protons.
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name______ periodic table packet #1 period______ directions: answer the…
1. A vertical column of elements in the periodic table with similar chemical properties due to the same number of valence electrons. 2. A horizontal row of elements in the periodi…
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question 18 in an aqueous solution, water molecules associate with one …
hydrogen bonds
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question 17 the tendency of dissimilar molecules to cling together and …
B. adhesion
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question 16 2 pts a covalent chemical bond is one in which ... ○ electr…
outer - shell electrons of two atoms are shared so as to occupy the outer electron shells of both atoms.
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question 15 2 pts which of the following explains most specifically the…
hydrogen bonds
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question 14 which of the following are the strongest molecular interact…
D. covalent bonds
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consider the generic chemical reaction depicted below: 2a + b -> c + 2d…
4
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the molar mass of acetic acid is 60.052 g/mol. how many moles of acetic…
B. 0.01672
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what results from the chemical reaction illustrated in this figure? for…
formation of an ionic bond
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consider the chemical structure depicted below. what is the molar mass?…
116.072 g/mol