Chemistry question and answers for October 01, 2023
- Q In which of the reactions below is ΔH not an enthalpy offormation?Group of answer choicesBoth b and c are not enthalpy of formation reactions.2C(s) + O2(g) → 2CO(g)Mg(s) + Cl2(g)...
- Q A mixture of NH3(g) and N2H4(g) is placed in asealed container at 310 K . The total pressure is 0.48 atm . Thecontainer is heated to 1200 K at which...
- Q calculate the volume (in milliliters) of 3.0M naoh that must beadded to a 1.00M ch3cooh solution to make a buffer having ph of4.90
- Q This question is from a Chemistry lab on constructing ahalf-potential reduction series. In part A of the lab we mustdetermine if a metal medallion is appropriate or not (could beiron,...
- Q Calculate ΔG∘rxn for the following reaction:4CO(g)+2NO2(g)→4CO2(g)+N2(g).Use the following reactions and given ΔG∘rxn values:2NO(g)+O2(g)→2NO2(g), ΔG∘rxn= -72.6 kJ2CO(g)+O2(g)→2CO2(g), ΔG∘rxn= -514.4 kJ12O2(g)+12N2(g)→NO(g), ΔG∘rxn=87.6 kJ
- Q The initial rate of the reaction of species A and B A + 2 B → Cwas measured at a temperature of 25 °C for various initialconcentrations of A and...
- Q All of the following statements are false EXCEPTGroup of answer choicesthe frequency of light is directly proportional to the speed oflight (in a vacuum).the wavelength of light is directly proportional...
- Q Biochemistry Question:Understand the role of keymetabolites in terms of whether the cell has energy or needs energy(e.g., glucose, acetyl-CoA, ATP, AMP,NAD+,NADH)Meaning, which meabolitesindicate that the cell has energy and which...
- Q Draw the distribution of d electrons for the central atoms inthe following molecules using crystal field theory.K3[Cr(C2O4)3]3H2O (octahedral)K2[Cu(C2O4)2]2H2O (tertrahedral)
- Q how do you find the wavelength of highest intensity fluorence bylooking at the excitation and emission spectrum?why do some wavelengths show maximum intensity and the restdecrease in fluorescence emission intensity?
- Q In the structure of testosterone, identify all the primary,secondary, tertiary, and quarternary carbons.
- Q anelastic container filled with an ideal gas occupies 148 L volume at85 degree c . what would the volumevbe at 15 degree c?
- Q A 0.5070 g solid sample containing a mixture of LaCl3 (molarmass = 245.26 g/mol) and Ce(NO3)3 (molar mass = 326.13 g/mol) wasdissolved in water. The solution was titrated with KIO3,...
- Q Balance the following redox reaction: NH4+to NO2- via oxygen reductionB) Write the full balanced reaction. No fractions.C) Indicate which species (molecules) are being oxidized andreducedD) Within these species (molecules), identify...
- Q Explain how the pH at which the iron is released from the proteinrelates to the pKa of the protein ligands.
- Q What volumes of 0.1 M acetic acid, pKa 4.76,and 0.1 M sodium acetate are required to make 1 L of acetatebuffer, pH 5.30?776 mL acetate, 224 mL acetic acid351 mL...
- Q 20.00 mL of 0.11 M HNO3 is titrated with 0.25 M NaOH. ï‚— Whatvolume of base is required to reach the equivalence point?Calculate pH at each of the following points...
- Q Consider the reaction A+2B⇌C whose rate at 25 ∘C was measured usingthree different sets of initial concentrations as listed in thefollowing table: Trial [A] (M) [B] (M) Rate (M/s) 1...
- Q Calculate ΔGo at 25oC for the reaction H2 + I2 D 2HI.Starting with 1.0 atm H2 and 1.0 atm I2, What is ΔG when: 0.1%, 1%,10%, 50%, 90%, 99%, and...
- Q Calculate the molar solubility at 25ï‚°C of BaSO4 in seawater inwhich the concentration of sulfate ion is 2.8g/L.Ksp=BaSO4=9.1X10-11
- Q These elementary steps are proposed for a mechanism:1) 2NO(g) → N2O2(g)2) 2H2(g) → 4H(g)3) N2O2(g) + H(g) → N2O(g) + HO(g)4) 2HO(g) + 2H(g) → 2H2O(g)5) H(g) + N2O(g) →...
- Q The following reaction can occur at 298K underappropriate conditions.2SO2(g) +O2(g)-----> 2SO3(g)An equilibrium mixture contain O2(g) and SO3(g) at partial pressureof 0.50atm and 2.0atm respectively. Using data available inAppendix 4 of...
- Q At 700
- Q 23. Nitrobenzene (NB) is made by nitrating benzene (B) with amixed acid (39% HNO3, 53% H2SO4,8% H2O). The reaction is:C6H6 + HNO3 ?C6H5NO2 + H2OConversion of B to NB is...
- Q 12. What is the molarity of 0.31 mol of NaCl in enough water tomake 2.0 L of solution?13. What is the molarity of the nitrate ions when 0.60 mol ofbarium...
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