If 28.0% of a sample of gallium-66 decays in 4.46 hours, what is the half-life of this isotope (in hours)

Q: Endothermic reactions should be cold to the touch?

A: There are two types of reactions- these are exothermic reaction and the endothermic reaction.  Both…

Q: Calculate the standard free-energy change at 25 ∘C for the following reaction:…

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Q: (a) Determine the valence electron counts on the transition metals. Find out the formal oxidation…

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Q: Draw the predicted major products of the following reactions. Ph OHC. (PhP)3RHCI PHCN, A H,CCH,…

A: 1. aldehyde FG to alkane using Wilkiinson catalyst. 2. Ring opening cross meta thesis and ring…

Q: A student attempts to determine the molecular weight of an unknown liquid with a boiling point of…

A: Given that -  Boiling point of unknown liquid = 79.6°C  While lowering the vapour pressure,…

Q: Consider the reaction 2CO2(g) + 5H2(g)C2H2(g) + 4H2O(g) Using the standard thermodynamic data in…

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Q: the Ka of an unknown acid

A: From the data given in the question, we have obtained the following titration graph using origin…

Q: What is the percent of chloride ion in a sample if 2.500 g of the sample produces 1.750 g of AgCl…

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Q: Considering perfect gases, which state function is zero when two substances are mixed? Entropy Gibbs…

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Q: After

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Q: Which of the following melecules is chiral? Be H a) b) CH3 H. OH e) d) H. CH, Br Br CH3

A: The chiral molecule among the given molecules = ?

Q: What is the name of this compound ? .CH2-C=C-CH3 a) 3-butyl-1,3-hexadiene-5-yne b)…

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Q: Terpin hydrate elixir should have _ mL of alcohol to make 250 mL elixir to ensure it will have 43%…

A: Given:: Volume of elixer = 250 ml  Strength of alcohol = 43% Volume of alcohol = ?

Q: 26. Given the following reaction, what volume of oxygen would be needed to react with 250. grams of…

A: Moles of propane = 250 g / 44.1 g mol-1 =5.6689 mol 1 mol of propane = 5 mol of O2 5.6689 mol…

Q: 7,(0) Compound X has the following percentage composition by mass: C: 38.9% ; H: 5.4% ; Cl: 38.4%;…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Using net ionic equations and solution stoichiometry, calculate the molarity of the principal…

A: The reaction between NH4OH and H2SO4 is as follows. 2NH4OH + H2SO4 = (NH4)2SO4 + 2H2O Now we have…

Q: Colligative property depends on the concentration and  not on the chemical identity of the solute…

A: Colligative property depends on the concentration and  not on the chemical identity of the solute…

Q: The property of the solution remains constant even if its composition varies. O True O False

A: Classification of properties -  Additive property.  Constitutive property. Colligative property.

Q: Consider the following combustion reaction: C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(g) ∆Hrxn = -2044 kJ…

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Q: 2.What mass in grams of silver nitrate must be dissolved to prepare 5.00X102ML of 0.150M AGNO3 (MM…

A: Answer: In this question we have to convert the molar concentration of solution into moles of silver…

Q: The property of the solution remains constant even if its composition  varies.  True  False

A: Solution is made up of two  components: solute and solvent. Solvent is present in major amount and…

Q: A solution is 0.085 M potassium carbonate, K2CO3. Determine the pH of the solution and the…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: For the following example, identify the following: F2(l) → F2(g) A. at low temperature, the…

A: Here we have to determine the condition at which the given reaction F2(l) –> F2(g) will be…

Q: Propose synthesis and show all intermediates for questions 3-4 HO H2N For #5 complete the rxn…

A: Pic 1 : oxidation followed c- alkylation using LDA. Second c-alkylation using LDA. One carbon Wittig…

Q: An analyst wanted to separate an essential oil which is partially immiscible in water and a boiling…

A: When there is a difference between the boiling points of components present in the liquid mixture…

Q: A 531.6 g sample of sodium undergoes a temperature change of +86.75 °C while absorbing 857.4 joules…

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Q: The graph shows the titration of the aqueous solution containing 0.138 g of unknown monoprotic acid…

A: For a monoprotic acid and NaOH , first we right a balanced reaction. At equivalence point , acid and…

Q: Provide the Lewis structure and molecular geometry as predicted by VSEPR (with solution) of the…

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Q: Scientist 1 analyzed the compounds first then gave it to scientist 2 for the next test. Scientist 2…

A: A question based on concentration terms that is to be accomplished.

Q: Consider the Gibbs Free Energy diagram shown (picture). Draw an arrow showing the formation of CO2…

A: The equation is: C(s) + O2(g) → CO2(g)

Q: 15. What is the shorthand notation that represents the following galvanic cell reaction? 2 Fe2+(aq)…

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Q: Q21. Find out the structure of compounds 1-3 in the following multistep synthesis. он DMSO, (COCI)2…

A: Detail mechanistic pathway is given below to find the intermediate product

Q: Using net ionic equations and solution stoichiometry, calculate the molarity of the principal…

A: net ionic equation is- CH3COO- + H+→CH3COOH (aq) Also, Moles = Molarity  * Volume

Q: In the Haber process, nitrogen reacts with hydrogen to form ammonia. N2 + 3H2 + 2NH3 AH = negative…

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Q: A chemist adds 1.05 L of a 0.40 mol/L calcium bromide (CaBr,) solution to a reaction flask.…

A: Given :- molar concentration of CaBr2 = 0.40 mol/L                Volume of solution = 1.05 L   To…

Q: A phase is a physical property of which describes the distance of molecules of matter. Phase also…

A: The given statements are :  Statement. 1 :- A phase is a physical property of which describes the…

Q: Calculate the wavelength of the photon absorbed by CO in the following vibration-rotation…

A: For CO Molecule Reduced mass mr  =mC×mOmC+mO=11.387×10-27 kg

Q: Question 12 The osmotic pressure of an aqueous solution at 309 K is 120 kPa. Calculate the freezing…

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Q: This refers to a point wherein both liquid phases have the same composition. Hence, extraction is…

A: Answer: This question is based on the Liquid-liquid extraction where certain terms are used to…

Q: Provide the reagents necessary to complete the following synthesis. Upload your synthetic…

A: 1. Ketal deprotection. 2. Grignard addition. 3. oxidation. 4. Wittig reaction. 5. Epoxidation. 6.…

Q: Questions: 1) A sample of antacid tablet that contains NaHCO3 is analyzed in the lab. The student…

A: Given that -  Mass of an antacid tablet, containing NaHCO3 = 1.50 g  Volume of HCl = 35.0 mL = 0.035…

Q: Which of the following phase diagrams corresponds to a system wherein boiling occurs before the two…

A: For the liquid-liquid phase diagram, the phase diagram that represents a system wherein boiling…

Q: Question 25 Consider the phase diagram of carbon dioxide. What is the pressure at the triple point?…

A: Triple Point :

Q: A 611.4 g sample of mercury absorbs 195.8 joules of heat. The specific heat capacity of mercury is…

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Q: 19 g of unknown organic sample was dissolve in 640 mL of Dicloromethane (DCM). The boiling point of…

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Q: Why does the concept of colligative properties apply only to dilute solutions? Eugenol is the active…

A: 1. Answer. : Colligative properties are properties of solutions that depend on the number of…

Q: A reaction has AS >0 and AH> 0. Which statement about this reaction must be correct? (A) If carried…

A: Answer: This question is based on the basic prediction about a reaction when it is an endothermic…

Q: At 700 K. the reaction 2502la) - Ozlal = 2503la) has the equilibrium constant Ke -4.3 - 106, and the…

A: The equilibrium reaction given is  2 SO2 (g) + O2 (g) ⇌ 2 SO3 (g)  The equilibrium constant, Kc =…

Q: (a) to (i): Determine whether each stereocenter marked by letters in red is R or S: H,N CI CI F CI F…

A: Note : Give the priority to atoms according to the atomic no at chiral center. Then the priority…

Q: Question 9 The phase rule describes the number of variances given the number of component present in…

A: Question 9  The phase rule states that for a heterogeneous system at equilibrium, the number of…

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.