Chemistry question and answers for July 17, 2023
- Q 1. Using the standard reduction potentials listed in Appendix Ein the textbook, calculate the equilibrium constant for each of thefollowing reactions at 298 K.A.Fe(s)+Ni2+(aq)?Fe2+(aq)+Ni(s)B.Co(s)+2H+(aq)?Co2+(aq)+H2(g)C.10Br?(aq)+2MnO?4(aq)+16H+(aq)?2Mn2+(aq)+8H2O(l)+5Br2(l)2. If the equilibrium constant for a...
- Q Is the carbon to nitrogen ratios in trees significantlydifferent from the ratio in a healthy adult human? Provide anexplanation of why differences may exist based on how nitrogen isused in...
- Q A solution was made by adding water to 0.250 g of H2Z until thevolume totaled 25.00 mL. Subsequent titration required 40.50 mL of0.100 M sodium hydroxide. Calculate the molar mass...
- Q 8. Silver ion is found with an average concentration of 28 ppbin U.S. water supplies. (Assume the density of water is 1.0 g/cm3)a) What is the molarity of the silver...
- Q Prepare the following solutions by determiing the proper mass ofsolute (or volume in the case where you are working from a stocksolution) that will need to be transferred to the...
- Q Sodium sulfate is slowly added to a solution containing 0.0500 MCa2 (aq) and 0.0350 M Ag (aq). What will be the concentration ofCa2 (aq) when Ag2SO4(s) begins to precipitate? Solubility-productconstants,...
- Q A solution of household bleach contains 5.25% sodiumhypochlorite, NaOCl, by mass. Assuming that the density of bleachis the same as water, calculate the volume (in mL) of householdbleach that should...
- Q Explain the hydrogen atom's \"galactic recycling\" process, frommolecular cloud to star to interstellar gas back to molecularcloud.
- Q Equilibrium Concentrations12345[FeSCN2+]1.49x10-5 M4.69x10-5 M7.47x10-5 M1.01x10-4 M2.65x10-4 M[Fe3+]6.0x10-4 M6.0x10-4 M6.0x10-4 M6.0x10-4 M6.0x10-4 M[SCN-]2.0x10-4 M4.0x10-4 M6.0x10-4 M8.0x10-4 M1.0x10-3 MEquilibrium Keq124.2195.4207.5210.4441.7Average Keq: 235.8Does your data support a complete conversion or partialconversion? Based on...
- Q Chemical Weapon ​Phosgene, COCl2,gained notoriety as a chemical weapon in World War I. Phosgene isproduced by the reaction of carbon monoxide with chlorine:CO(g) + Cl2(g) <=>COCl2(g)          Thevalue of Kc for this...
- Q Pyridine is a weak base that is used in the manufacture ofpesticides and plastic resins. It is also a component of cigarettesmoke. Pyridine ionizes in water as follows:C5H5N+H2O⇌C5H5NH++OH−a) The pKb...
- Q 1.Explain why a d5 high spin complex would be rare?2. Would a d4 high spin square planar complex be reasonable?Why?3. Explain why a ligand capable of pi-donation would stabilizea square...
- Q Carbon disulfide is prepared by heating sulfur and charcoal. Thechemical equation isS2 (g) + C (s) <----> CS2(g)Â Â Â Â Â Kc=9.40 at 900KHow many grams of CS2(g) can be prepared by heating 12.4...
- Q Part AHow many moles of HF (Ka=6.8×10−4) must beadded to water to form 0.230 L of solution with a pH of 2.50?Express your answer using two significant figures.n=____mol
- Q The first-order rate constant for the decomposition of N2O5,2N2O5(g)→4NO2(g)+O2(g)at 70∘C is 6.82×10−3 s−1. Suppose we start with2.80×10−2 mol of N2O5(g) in a volume of 2.2 L .How many moles of...
- Q #15.114Calculate the concentration of all species in a 0.165 M solutionof H2CO3. (express to 2 sig figs)[H2CO3], [HCO−3], [CO2−3], [H3O+], [OH−]
- Q Part A) Find the pressure in mmHg of a 0.124 g sample of heliumgas in a 649 mL container at 34 ∘C. Express the pressure to threesignificant figures and include...
- Q #15.80 Find the pH of each of the following solutions ofmixtures of acids. (express answers to 2 decimal places)1) 8.0×10−2 M in HNO3 and 0.180 M in HC7H5O22) 9.0×10−2 M...
- Q Mole fraction and mass percent:1) An aqueous solution is36.0 % bymasspotassium bromide,KBr, andhas a density of 1.33 g/mL.The mole fraction ofpotassium bromide in thesolution is .2) The mole fraction ofammoniumcarbonate,(NH4)2CO3,in...
- Q One hundred moles of CO at 300ºC is burned with 100 moles of O2which is at 100ºC; the exit gases leave at 400ºC. What is the heattransfer to or from...
- Q complete combustion of a 0.30- mol sample of hydrocarbon gives1.20 mol of CO2 and 1.50 mol of H2O. What is the molecular formulaof the original hydrocarbon?
- Q A mixture of 0.02958 mol of O2, 0.01705 mol of NOCl, 0.03162 molof NO2, and 0.008375 mol of Cl2 is placed in a 1.0-L steel pressurevessel at 2458 K.The following...
- Q Chromatography is used in many different ways in the workplace toanalyze medical, environmental, and industrial samples, forexample. How does it accomplish this in terms of physical andchemical interactions?
- Q what is the effect of pH on fluorescence intensity andwavelength maximum for fluorescein
- Q Listed below are the constants in three activity-coefficientequations: Wilson's, Margules' and van Laar's, for the systemethanol-water. In addition, the vapor-liquid equilibria at onepressure are tabulated.a) Using the Wilson equation and...
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