Chemistry question and answers for August 25, 2023
- Q The reaction2NOCl(g)=2NO(g)+Cl2(g)comes to equilibrium at 1 bar total pressure and 227C when thepartial pressure of the nitrosyl chloride, NOCl, is 0.64 bar. OnlyNOCl was present initially. (a) CalculatedeltarGo for this...
- Q What is the % yield of the reaction making 4.9 g of acetylsalicylic acid from 6.6 g of salicylic acid, 6.4 mL of aceticanhydride (density 1.082), and 10 drops 85...
- Q Equilibrium constants at 25 ?Care listed in the table below.SubstanceKcValue of KcCaCO3Ksp4.5
- Q Consider the reaction: FeS(s) + 2HCl (aq) --> FeCl2(aq) +2H2S(g). A 4.00g sample of FeS containing nonsulfuide impuritiesreacted with HCl to give 896mL of H2S at 14C and 782 mmHg.Calculatemass...
- Q Consider the titration ofa 25.0 mL solution0.150 M HF with 0.150M NaOH. What is the pH of the solution before addition of titrant,after addition of 10.0mL, and after addition of...
- Q Air at 38.0°C and 99.0% relative humidity is to be cooled to16.0°C and fed into a plant area at a rate of 510.0m3/min. You may assume that the air pressure...
- Q 39What is the theoretical yield (in g of precipitate) when 15.8 mLof a 0.572 M solution of iron(III) chloride is combined with 16.8mL of a 0.687 M solution of lead(II)...
- Q 50.00ml of a saturated solution of calcium hydroxide is titratedwith (5.00 x 10^-2 M) HNO3. The endpoint is reached when24.40ml of the acid is added. What is the molarity and...
- Q A 360.0 −mL buffer solution is 0.170 M in HF and 0.170 M inNaF.A) What mass of NaOH could this buffer neutralize before the pHrises above 4.00?B) If the same...
- Q Zn|Zn2+(1.00M)|| UO22+(1.00M), U4+(0.1M), H3O+(1.00M) |Pta) Calculate the potential in the following cell (no current isflowing)b) The cathode has a volume of 50 mL. What is the cell potential(no current) after...
- Q QuestionMethane gas (CH4) enters a home heating furnace operating atsteady state and burns completely with 110% of theoretical dry air,each stream entering at 77 F, 1 atm. Combustion products aredischarged...
- Q The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 =7.32. Calculate the pH at each of the following points in thetitration of 50.0 mL of...
- Q A voltaic cell is constructed that uses the following reactionand operates at 298 K. Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) (a)What is the emf of this cell under standard conditions?______V(b)...
- Q Are the following statements true or false?1. A double bond consists of two pairs of electrons.2. Side-to-side overlap results in a bond with electron densityabove and below the bond axis.3....
- Q A 2.32 g sample of a substance suspected of being pure gold iswarmed to 71.9 ∘C and submerged into 15.9 g of water initially at24.9 ∘C. The final temperature of...
- Q For the reaction shown, compute the theoretical yield of theproduct (in grams) for each of the following initial amounts ofreactants.Ti(s)+2F2(g)→TiF4(s)1)7.0 g Ti , 7.0 g F2Express your answer using two...
- Q Classify each statement as applying to osmosis, dialysis, orboth osmosis and dialysis. Be sure to place all statements. Note:If any part of this question is answered incorrectly, a single redX...
- Q Protein confusion:Can proteins function as buffers?Does hydrolysis of a protein change its primary structure?What about denaturing a protein does this change the primarystructure?
- Q Which method, UPS or XPS, is better for resolving chemicalshifts and why? Which direction would a peak in a given spectrummove if an atom loses a valence charge? What if...
- Q 13. Construct energy-level diagrams for both high- and low-spinsituations for the d6 electron configuration in (a) an octahedralfield; (b) a tetrahedral field.Please explain if possible...I do understand the orbitalprinciple generally....
- Q The titration of weak diprotic acid H2A with strongbase is conducted. What is the pH of the solution at the followingvolumes, 0,10,25,50,60,75,100,125,and 150mL ifKa1=1.0x10^-4 andKa2=3.5x10^-4 and the concentrations for bothHA-...
- Q Weak AcidKaWeak BaseKbCH3COOH (Acetic Acid)1.8 X 10-5NH3 (Ammonia)1.76 X 10-5C6H5COOH (Benzoic Acid)6.5 X 10-5C6H5NH2 (Aniline)3.9 X 10-10CH3CH2CH2COOH (Butanoic Acid)1.5 X 10-5(CH3CH2)2NH (Diethyl amine)6.9 X 10-4HCOOH (Formic Acid)1.8 X 10-4C5H5N (Pyridine)1.7...
- Q 1. Which of the following slightly soluble substances are moresoluble in acidic solution: AgCl AgCN CaF2? Explain why.2. 50.0 ml of a solution containing 0.010M Pb(NO3)2 is mixedwith 50.0 ml...
- Q A 2.43 g lead weight, initially at 10.6 ∘C, is submerged in 7.78g of water at 52.9 ∘C in an insulated container. What is the finaltemperature of both the weight...
- Q Consider the following balanced equationCa3(PO4)2 (s) +3H2SO4 (aq) -------> 3CaSO4 (s)+ 2H3PO4 (aq)What masses of calcium sulfate and phosphoric acid can beproduced from the reaction of 1.0 kg calcium phosphate...
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