Chemistry question and answers for July 10, 2023
- Q Calculate the value of ΔG°, ΔH°,& ΔS° for the formation of phosphorous trichloride fromits constituent elements at 25°C.​P2 (g)+  3Cl2 (g) →2PCl3 (g)is ________kJ/mol.
- Q A certain weak acid, HA, with a Ka value of 5.61×10−6, istitrated with NaOH. A solution is made by titrating 9.00 mmol(millimoles) of HA and 1.00 mmol of the strong...
- Q A system is composed of nitrogen gas and gasoline (liquid+vapour). According to the gibbs phase rule how many independentproperties are required for phase equilibrium?Please show yourworkings and the steps you...
- Q A 1 liter solution contains 0.382 M hydrofluoric acid and 0.509M sodium fluoride. Addition of 0.191 moles of sodium hydroxidewill: (Assume that the volume does not change upon the addition...
- Q Effects of green and blue fluroescent dyes were explored in thesynthesis of benzopinacol. Dye A quenched the synthesis ofbenzpinacol and had a blue fluoresent light in thechemilluninescent reaction. Dye B...
- Q Can someone please explainformation of imines, oximes, hydrazones, phenylhydrazones andsome examples, thanks
- Q The following data were obtained from experiments to find themolecular formula of lidocaine, a local anesthetic, which containsonly carbon, hydrogen, nitrogen, and oxygen. Complete combustion ofa 3.54-g sample of lidocaine...
- Q The following osmotic pressure data are availabel for apolymerc (g/dL-1)h (cm of solvent).320.700.661.821.003.101.405.441.909.30Given this information and assuming the tempeture is 25 degCelcius and the solvent density is 0.85 g/cm^3, provide...
- Q Volatile chemicals are often extracted into a water immisciblephase for analysis using gas chromatography. Consider benzene,which is mildly soluble (for an aromatic compound) in a watersample in a sealed 100-mL...
- Q Propose a nucleophilic aromatic substitution mechanisms for thereactions ofa) 2,4-dinitrochlorobenzene + sodium methoxideb) 2,4-dimethylchlorobenzene + sodium hydroxide, 350 degreesCc) p-nitrobromobenzene + methylamined) 2,4-dinitrochlorobenzene
- Q why do you use a specific wavelength of light to recordabsorbance measurements for the dye?
- Q Calculate the equilibrium concentrations of NH3,Cu2+, [Cu(NH3)]2+,[Cu(NH3)2]2+,[Cu(NH3)3]2+, and[Cu(NH3)4]2+ in a solution made bymixing 500.0 mL of 3.00 M NH3 with 500.0 mL of 2.00 x10-3 M Cu(NO3)2. The sequentialequilibria areCu2+...
- Q Stock solutions will be available which are 0.23 Mcyclohexanone, 0.5 M H+, and 0.018 M I3–. Mixture B: 1.0 mL H+(acid) 1.5 mL cyclohexanone For measuring the order with respect...
- Q Which term in the Van Deemter equation is affected by thefollowing changes and would plate height increase or decrease?Explain your reasoning.(a) Changing the mobile phase from a gas to a...
- Q Question:I2 is considerably more soluble in CCl4(l) than it is in H2O(l).At a certain temperature, the concentration of I2 in its saturatedaqueous solution is 1.300×10−3 M, and the equilibriumachieved when...
- Q Lab Experiment: Fluoride Speciation and Analysis by FlowInjection using Ion-Selective Electrode.Q1) what is the Nernst equation for the Fluoride Ion SelectiveElectrode (ISE)? How does this show that measured potential isproportional...
- Q why the refractive index is a good way to analyze theliquid?
- Q A mixture of 4-methylphenol and 4-methylcyclohexanol was run ona TLC plate using 3:1 hexane:ethyl acetate as the eluent. Only onespot was seen using a UV lamp. Does this mean that...
- Q Given the following unbalanced reaction and thermodynamicsinfromation, what is deltaGknot rxn at 85 degrees Celcius. Pleasereport your answer in kj/mol and to the correct number ofsignificant figures.C2H6 (g) + O2...
- Q part A)Three gases (8.00 g of methane, CH4, 18.0 g of ethane,C2H6, and an unknown amount of propane, C3H8) were added to thesame 10.0-L container. At 23.0 ∘C, the total...
- Q What role does the sulfuric acid play in the formation of thenitronium ion? Since nitric acid itself is an acid, then why shoulda second acid (the sulfuric acid) be added?
- Q What role does the hydrogen peroxide play in the synthesis of aPentammino Complex of Cobalt(III) Chloride [Co(NH3)5Cl]Cl2,Pentamminenitro- and Nitritro- Cobalt(III) Chloride
- Q How does ATP play a role in controlling the citric acid cycle?
- Q What are the four factors to consider whendeciding whether a reaction proceeds via an SN1 oran SN2 reaction mechanism? Howdoes each factor play a role?
- Q Consider the final reaction in the citric acid cycle, catalyzedby malate dehydrogenase:Malate + NAD+  ⇄ oxaloacetate + NADH + H+Equilibrium concentrations of the reaction components weremeasured as follows:[malate] = 5.28 mM[NAD+]...
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