Answers created by Truong-Son N.

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• Calculate the equilibrium concentrations of reactant and products when 0.331 moles of PCl3 and 0.331 moles of Cl2 are introduced into a 1.00 L vessel at 500 K?
  
• If the temperature of a gas doubles, a. What happens to the kinetic energy of the molecules of the gas? b. What happens to the velocity of the molecules of the gas?
  
• Could you please help me with this problem? thank you!!
  
• An electron of energy 10.8 ev is incident on an H atom then?
  
• An unknown alkane (not a cycloalkane) yielded 12.1g of CO2 and 5.4g of H2O when combusted in excess oxygen. What is the molecular formula for the alkane?
  
• Help! With my solution to this Equilibrium problem. Please help me solve the quadratic for this problem and Are my written steps correct?
  
• Could someone please correct my answer to the Equilibrium reaction question?
  
• Can anyone please explain me in details about what are the assumptions made for the derivation of Schrödinger Wave Equation?
  
• Use the a) and b) to prove #hatT_L = e^(LhatD)# #(a)[hatT_L,hatD]=0# #(b)[hatx,hatT_L]=-LhatT_L# ?
  
• If #hatT_L# is the translation operator ,which acts on a function like this #hatT_Lf(x) = f(x-L)# and #hatx#which acts on #hatxf(x)=xf(x)# then prove #[hatT_L ,hatx]= -LT_L# ? Also how will translation operator act on the fourier transform of #f(x)#
  
• If #hatT_L# is the translation operator ,which acts on a function like this #hatT_Lf(x) = f(x-L)# and #hatx#which acts on #hatxf(x)=xf(x)# then prove #[hatT_L ,hatx]= -LT_L# ? Also how will translation operator act on the fourier transform of #f(x)#
  
• A #"100.00-mL"# solution containing #"0.500 M"# #"NH"_3# and #"0.500 M"# #"NH"_4^+# (#"pK"_a = 9.26#) had #"NaOH"# added to it, and increased to a #"pH"# of #10.26#. If #"20.45 mL"# of #"NaOH"# was added, what was its molarity at the time of addition?
  
• #(1/3x - 2/5) + (3/4x^2 + 2/3x - 1/5)#?
  
• Compute normalization constant A if #n=1#?
  
• What is a good, simple definition for standard enthalpy change? Standard enthalpy of formation? And entropy? What about delta S and delta G?
  
• Use Trouton’s rule to estimate the standard enthalpy of vaporization of liquid bromine, which boils at #59.8^@ "C"#?
  
• What are the nodal planes in #3d_(x^2-y^2)# orbital?
  
• How does the de-broglie wavelength of charged particle change when accelerating potential increases?
  
• Compute normalization constant A if #n=1#?
  
• How can we account for the color change of the solution?
  
• Question dealing with pseudo-first order reaction?
  
• PLEASE HELP! If the presence of 2.00g of an unknown non-ionizing substance lowers the freezing temperature of a 10.00g sample of benzene by 6.33 degrees celsius, calculate the molar mass of the substance?
  
• True or false? Aquaregia is a mixture of hydrochloric acid and sulphuric acid. Thanks
  
• why [CuCl4]2- has a flattened tetrahedral structure, not regular tetrahedron and [CoCl4]2- is tetrahedron?
  
• Planck's quantum theory.explain?
  
• An item costing #$125# was marked up by #30%# of the selling price. During a sale, the item was reduced to #$120#. What was the rate of markdown during the sale?
  
• Calculate the pH of the solution of #10^(-6)# M #NaOH# at #50^o#C?
  
• The melting point of RbBr is 955 K while that of NaF is 1260 K.... (1) Melting point of NaF is much larger that that of RbBr...why?(it is mainly due to.. .)
  
• What is definition and formula of 'molal specific volume' ?
  
• Why KMnO4 in alkaline solution accept 3e per Mn and act as mild oxidizing agent while in acidic solution can gain 5 electron per Mn act as strong oxidizing agen???
  
• A hydrogen atom transitions from #n_i = 1# to #n_f = 7#. What needed to happen to cause this change? Which states did the atom start and end in? What is the change in energy?
  
• How Can Bonding And Antibonding Electron Can Be Identified In 2p Orbital?
  
• Compute #hatP^2# and is #hatP# idempotent?
  
• PLEASE Help! with Reactants decreasing in Molarity?
  
• For the overall reaction given below at #25^@"C"#, if a saturated solution has formed, then if #["I"^-]_i = "0.500 M"# and the concentration has increased of the products by #1.33 xx 10^(-3) "M"# to reach equilibrium, what is #["I"_3^(-)]# at equilibrium?
  
• Due to what is ice less dense than water?
  
• A certain gas begins at #"10 atm"#, #"300 K"#, and #"1 L"#. If it expands in a closed container to #"5 atm"# and #"4 L"#, and the heat capacity is #"50 J/"^@ "C"#, what is the change in enthalpy?
  
• What is selectivity? Is there any effect of selectivity in the halogenation reaction?
  
• Question #ef597
  
• Find the RMS speed of #"H"_2# at #"273.15 K"# and #"293.15 K"#? The density at STP is #"0.08988 g/L"#.
  
• Would pure, de-ionized water conduct electricity?
  
• Chemistry question over pH?
  
• An electron will have highest energy in which set ? A. 3,2,1,1/2 B. 4,2,-1,1/2 C. 4,1,0,-1/2 D. 5,0,0,1/2
  
• Calculate the concentration at equilibrium?
  
• Help with Kinetics 2 Step Reactions?
  
• 0.1M Formic Acid solution is titrated against 0.1 M NaOH solution.What would be the difference in pH between 1/5 and 4/5 stages of neutralization of acid?
  
• Help! What is a multi-step mechanism? Please help me to solve this?
  
• Find #j(x)#. What type of wave this is describing?
  
• Question #37f4a
  
• What is the chemical reaction for the melting of wax?
  
• What is the average KE of N2 at 1 atm and 298K?
  
• The rate constant is numerically the same for 3 reaction of first second and third order respectively the unit of concentration being in mole per litre which reaction should be the fastest?
  
• What number of molecules of water contains #"0.6 atoms"# of #"H"#? What number of molecules is going to contain a total of #"4.5 atoms"#?
  
• The position of a neutron in nucleus is known within an uncertainty of #5 xx 10^(-15) "m"#. At what speeds might we expect to find it moving?
  
• A student attempted to dissolve a liquid ionic solute in a nonpolar solvent. The resulting mixture showed three distinct layers...?
  
• How many cyclic isomers does C5H10 have?
  
• Why is there a discrepancy in the force constants of #"HBr"# vs. #"HCl"#?
  
• How do you name #"Al"("H"_2"O")_6^(3+)#?
  
• What are bonding and anti-bonding molecular orbitals ?
  
• How do you prove that đq is not an exact differential for an isobaric process using #đq = dU - đw# where the only work is PV work?
  
• Conductivity of 0.001M acetic acid at a certain temperature is 5.07×10^-5 S/cm.if limiting molar conductivity of acetic acid at the same temperature is 390 S cm^2/mol.the dissociation constant of acetic acid at that temperature is?
  
• Catalyst verses Reaction Intermediate? Please help me to understand?
  
• Does anything have a positive enthalpy of formation?
  
• Explain the Lanthanide Contraction?
  
• If the relative decrease in vapor pressure is #0.167# for a solution containing #"NaCl"# in #"180 g"# of water, what is the mols of #"NaCl"# in the solution phase?
  
• How do you derive this relation for enthalpy using this equation for internal pressure?
  
• How do I solve this Trigonometric equation ?( please show steps): 1-sinθ = (sinθ ) (cscθ -1)
  
• 2 mole of an ideal gas expanded isothermally and reversibly from 1L to 10L at 300K. What is the enthalpy change??
  
• The solubility product constant of CaSO4 is 2.4 x 10^-5 mol2dm-6, K sp of Ca(OH)2 is 5.5 x 10^-6 mol3dm-9 and K sp of CaCO3 is 8.7 x 10^-9 mol2dm-6. How can I calculate the concentration of Ca2+ in the solution?
  
• The vapor pressure of pure cyclohexane (C6H12) and pure toluene (C7H8) at 20°C are 66.9 and 21.1 torr, respectively. The total pressure above a mixture of these two liquids is 50.0 torr. Calculate the mole fraction of cyclohexane in the liquid mixture?
  
• For hydrogen molecule, how many mols of it are there in #"33.4 L"# at STP?
  
• Why do you NOT scale the standard cell potential when you scale reactions by a constant?
  
• In knowing #DeltaG_(rxn)# for the following reactions at #25^@ "C"# and #"1 atm"#, can we say anything about the reaction speeds?
  
• What is the ionization energy of hydrogen atom in eV?
  
• Draw the diagrams for #"NO"_2^-#, #"NO"_2^+#, and #"NO"_2#. The HOMO of #"NO"_2^-# shows it is somewhat anti-bonding. Would you expect the nonbonding electron pairs on nitrogen or oxygen to be more reactive? Discuss
  
• What is linear combination of atomic orbitals for CO2?
  
• why are the energies below different ? both are just breaking the same type of bond: ONCl --> NO + Cl >H= 158 kj mol-1 NCl3 --> NCl2 + Cl >H= 375 kj mol-1
  
• Use the two point form of the Clausius-Clapeyron equation to calculate the vapor pressure of carbon disulfide at 15 degrees C. This temperature in kelvin would be 288. The normal boiling point of CS2 is 46 degrees C. This temperature in kelvin.......?
  
• #(del^2Psi)/(delx^2) + (8pi^2m)/(h^2)(1/2mv^2)Psi = 0# Find #xmv# ?
  
• #psi(x) = 1/(sqrt(2pibarh))intPhi(p)e^(1/hpx)dp# Is #Phi = e^(im_lphi)#?
  
• How much faster is a reaction at #"313 K"# compared to at #"303 K"# if the activation energy is #"58 kJ/mol"#?
  
• Indicate in each case base, acid and conjugate pairs?
  
• Question #f0318
  
• Question #f6cb7
  
• What is the overall order of reaction if the rate law is #r(t) = [F_2][Cl_2O]#?
  
• Can the Uncertainty Principle equation be derived from the Schrodinger equation? Kindly show all steps?
  
• Which transition metals have #3d^5# in their valence electron configurations?
  
• What is the rate constant for crystal violet reacting with NaOH???
  
• Is there any difference between an orbital and a nodal plane?
  
• Find most acidic hydrogen?
  
• A molecule of oxygen gas (O2 ) has a velocity of 2800 m / s. What is its de Broglie wavelength?
  
• A medication is prescribed at 4.00 mg/kg of body weight. If the patient is given 320. mg of medication, what is that patient's body weight in pounds?
  
• Which image shows that kinetic energy is proportional to the temperature of gases?
  
• If there is a hydrogen atom in vacuum,will the momentum of the electron will be constant or not ?Why will it change
  
• From the equilibrium constants below, calculate the equilibrium constant for the overall reaction?
  
• Osmotic Pressure problem with a Protein?
  
• Help! Kinetics and the Rate of Formation???
  
• How can one describe the #Deltap " and " Deltax# in respect to the Schrodinger Equation?
  
• Boiling Point Help! Solution has 8.35g l2 in 71.0g of toluene. Assuming I2 is nonvolatile. Toluene, Tb = 110.63celsius and Kb = 3.40celsius*kg/mol ?
  
• Vapor Pressure Problem Please Help? Chemistry 2?
  
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