A chemist weighed out 81.7 g of potassium. Calculate the number of moles of potassium she weighed out. Round your answer to 3 significant digits. mol ☐x10 ×

Q: 83. Determine the pH of each solution and classify it as acidic, basic, or neutral. (a) pOH = 8.5 =…

A: We know that PH = 14 - POH

Q: The boiling point of chloroform, CHCI,, is 61.700 °C at 1 atmosphere. K₁(chloroform) = 3.67 "C/m In…

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Q: The half-life of nitrogen-16 is 7.0 seconds. How long does it take for 100 mg of nitrogen-16 to be…

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Q: 7. Which of the following acids is strongest, based on the values of their acid ionization…

A: We have been asked two questions. In one question, we have been asked to choose strongest acid on…

Q: For many purposes we can treat ammonia (NH3) as an ideal gas at temperatures above its boiling point…

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Q: The decomposition of SO2Cl2(g) into SO2(g) and Cl2(g) has a rate constant of 2.90 x 10-4 s-1. If the…

A: A numerical problem based on chemical kinetics. Rate constant, initial concentration and the…

Q: Identify the conjugate acid for each base. conjugate acid of HCO3: conjugate acid of SO²: conjugate…

A: When a base accept a proton ,then an acid forms , which called conjugate acid.  And when an acid…

Q: 2. Consider the following electrochemical cell at 25°C given the thermodynamic constants below:…

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Q: The natural abundance of 14C in the earth's atmosphere and all living organisms is approximately…

A: Given, The half-life of C14 =t12= 5730 years The rate constant and half-life are related to each…

Q: Predict the product for the following reaction شعر بله بله بله بلد بلد OTS 1. Nal/acetone 2.…

A: This reaction is double SN2 reaction because in first SN2 iodide ion attack from above side and then…

Q: The chemical formulae of some acids are listed in the first column of the table below, and in the…

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Q: Which of the following solutions will show buffer properties?     100 mL of 0.25 M NaCH3CO2 + 150…

A: Answer:- For the given solution mixtures, the mixture which will have both acetic acid and acetate…

Q: Acetic acid’s pKa is 4.75 and nitrous acid’s pKa is 3.16. If you made one buffer of equal parts…

A: Given: PKa of acetic acid = 4.75 PKa of nitrous acid = 3.16

Q: SO has several resonance structures. Consider one of these structures in which all the atoms follow…

A: Correct answer is  The molecular geometry or shape of SO3 is trigonal Planar. It is exceptional case…

Q: Calculate the pH of a solution that is 0.80 M in lactic acid and 0.40 M in the lactate ion.  (Ka…

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Q: 47. Four solutions of unknown HCl concentration are titrated with solutions of NaOH. The following…

A: Given , HCI is titrated with NaOH solution.

Q: Questions 1. What is the wavelength of a photon with a frequency of 56.72 Hz?

A: As per bartleby guidelines i answered only first question so please don't mind and post other…

Q: A redox reaction used in an electrochemical cell has a negative standard free energy change, AGrxn-…

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Q: A solution of 0.152 M NaOH is used to titrate 18.0 mL of a solution of H₂SO4: H₂SO4 (aq) + 2NaOH(aq)…

A: Given: The molarity of NaOH = 0.152 M The volume of H2SO4 taken = 18.0 mL The volume of NaOH…

Q: 3. Complete the table. (The first row is completed for you.) Acidic or Basic acidic [H3O+] 1.0 x…

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Q: Example: A sample of lead (s = 0.130 J/g-°C) is heated to 90.°C and then dropped into 80. g of water…

A: Q = m . s . ΔT Where, Q = heat absorbed or evolved; m = mass of substance; s =specific heat of…

Q: + Na+ I Sodium Iodide acetone + Na+ CI™ Sodium Chloride

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Q: Example: Predict which molecule has greater surface tension: C₂H5OH or H H | | H-C - C - OH - | I HH…

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Q: Give the proper name for the compound [Co(NH3)4]Cl2

A: Given compound :  [Co(NH3)4]Cl2

Q: Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in…

A: To find out the amount of gallium(III) produced, we need to use the Faraday's second law of…

Q: Nitrogen and oxygen react to form nitrogen monoxide, like this: N₂(g) + O₂(g) → 2 NO(g) - The…

A: Le chatelier principle says that equilibrium will shift in such a way so as to  undo the effect of…

Q: Question 49 Which of the following is the major E2 product formed from the following alkyl halide? 2…

A: Organic reactions are those in which organic reactant react to form organic products. In the given…

Q: I. Identify the oxidation number by writing the number on top of each element on the given equation.…

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Q: When a smoldering toothpick was inserted to a tube containing a gas, the toothpick flared or…

A: Oxygen (O2) will be correct option. When a smoldering toothpick is introduced to a sample of pure…

Q: 3 PPM 2 180 El-MS: 88.1 160 140 120 100 PPM 80 60 40 20 0

A: Number of signals in 1H NMR = Number of sets of protons in different electronic environment Position…

Q: 61. Anhydrous chromium(III) chloride, CrCl3, is prepared by reacting Cr₂O3 with CCl4 at 800°C.…

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Q: 3. Identify the reagents you would use to accomplish each of t transformations: Br Br OH НО. НО OH…

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Q: The Ka of the conjugate acid of a pesticide is 6.7 x 10-6. What is the Kb of the pesticide at 25°C?…

A: The product of the acid dissociation constant of an acid and the base dissociation constant of a…

Q: A closed vessel is charged with 0.74 bar of hydrogen gas and allowed to react with excess I2(s) at…

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Q: Kindly draw the structure of 3-isopropyl-5,5-dimethyl-6-phenylhexanal

A: The compound is 3-isopropyl-5,5-dimethyl-6-phenylhexanal  So,  in hexanal ( an aldehyde)  , four…

Q: Given the equilibrium reaction, BaCO3(s) ⇌ Ba2+(aq) + CO32-(aq)          Ksp = 2.58 x 10-9 What is…

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Q: If a 238U atom decays by a series of radioactive decays that includes emission of 4 alpha particles…

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Q: If the reaction quotient is less than the equilibrium constant, the reaction is expected to proceed…

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Q: Math Example Calculate In (74.10). In(74.10) = Calculate e7.98 €7.98= Chemistry Example A freshly…

A: ln(74.10) = 4.31 e7.98=2.92×103

Q: 4. Identify all types of intermolecular forces that are presents in the following substances. a. NH3…

A: We have been given four molecules and we have been asked to identify all types of intermolecular…

Q: How many different signals are there in the molecule shown? A) 1 B) 2 C) 3 D) 4 H3C CH₂ CH₂ CI CI…

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Q: Yo दू mCPBA 1) LIAIH, 2)H30 1) EMg Br 2) HO का का HBr -20°C HBr 80°C

A: The major products of the reactions are given below -

Q: 2. Provide the reagent(s) necessary to achieve the following reactions. لسلة a. b. سلام HO' OH ستر…

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Q: A sample of an unknown compound is vaporized at 150. °C. The gas produced has a volume of 2330. mL…

A: Mole is equal to weight of substance divide by it's molar mass

Q: Compute for the pH when a 25.00 mL of 0.1000 M HNO2 (47.01 g/mol; Ka = 4.5 x 10-4) was titrated with…

A: 25.00 mL of 0.1000 M HNO2 was titrated with 0.00 mL of 0.1000 M NaOH solution. The Ka of HNO2 is…

Q: Give a reasonable mechanism for this reaction. Explain why it is exothermic. Н+ Дон H2O

A: Organic reactions are those in which organic reactant react to form organic products. In the given…

Q: Which product is formed in the reaction shown? o O O O OD) C) A) 1) BH, 2) H₂O₂, OH Both 1 B) 11…

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Q: Consider 100 mL of 0.10 M Ba(OH)2 (solution 1) and 0.10 M NaOH (solution 2), which of the following…

A: Using ionization concept of acid and base, comparison of pH of solutions are performed.

Q: 1 Determine the pH of the resulting solutions when the following reagents are mixed. a. 25.00mL of…

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Q: You want to make a 410mM Na+ solution. You have 1.7mL of a 1.6M NaCl solution, what is the final…

A: Given, Note:  Initially solution of NaCl, Concentration of NaCl solution (M1) = 1.6 M  Volume of…

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.