Monday, October 31, 2011

cl p

  • Question:-What is the best electric supply company other than CL&P?
    I just got a phone call from an electric supply company saying they can give me a lower rate on my electric bill... I understand electric companies were deregulated 10 years ago...is there a particular company that is better than the others? Thanks in advance!
    I live in Connecticut!

    Answer:-not knowing where you live makes it hard to give you a good answer.
  • Question:-How many electrons are in the second energy level for Cl, P, and K?


    Answer:-All elements past Neon (number 10) have full "second energy levels" in the ground state.
    Therefore, Cl, K, and P all have 8 electrons, denoted as 2s2 2p6
  • Question:-Use a table of bond energies to determine the atomization energy of PCl3 and the average P-Cl bond energy in P?
    Use a table of bond energies to determine the atomization energy of PCl3 and the average P-Cl bond energy in PCl3.

    D(P-Cl) =.......... kJ/mol

    Use the P-Cl bond energy and the atomization energy of POCl3 to determine the P-O bond energy in POCl3.

    D(P-O) = ........kJ/mol

    Answer:-
    the table @ http://www.cem.msu.edu/~reusch/VirtualText/react2.htm
    lists the the average P-Cl bond energy as 79 kcal /mole, (aka 331kJ/mole)

    Using that table of bond energies to determine the atomization energy of PCl3 : you break 3 P-Cl bonds @ 331kJ each =
    your first answer: 993 kJ
    ==========================================

    I believe your second question wants us to use this reaction:
    PCl3 (g) --> P (g) & 3 Cl(g) to find a comparable bond ernergy instead of using the 79kj/mol

    PCl3 (g) --> P (g) & 3 Cl(g)
    dH reaction = dHf's products - reactants
    dH reaction = [ 316.4 kJ /mol P(g) & (3 mol)(121.7 kJ/mol Cl(g)] - [-288.07 kJ/mole PCl3(g)]

    dH reaction = 681.5 + 288.07

    dH reaction = 969.6 to break 3 P-Cl bonds

    so your answer to,... "the average P-Cl bond energy in PCl3" :
    969.6 / 3 = 323.2 kj / mol

    this tells you that it requires less energy to break the P-Cl bonds in PCl3 than the average P-Cl bond,... which means that those P-Cl bonds in PCl3 are more unstable than the average P-Cl bond
    =================================================


    the atomization energy of POCl3 , using dHf's for the reaction:
    POCl3 (g) --> P(g) & 3Cl (g) & O (g)

    dH reaction = dHf's products - reactants
    dH reaction = [ 316.4 kJ /mol P(g) & (3 mol)(121.7 kJ/mol Cl(g) & 247.5kJ/mol O] - [-542.2 kJ/mole POCl3(g)]

    dH reaction = 929.0 + 542.2

    dH reaction = 1471.1

    1471.1 = breaking 3moles P-Cl bonds & 1mole P=O bond
    1471.1 = (3mol P-Cl )(331 kJ/mole) & 1mole P=O bond
    1471.1 = 993 & 1mole P=O bond
    1mole P=O bond = 478 kJ/mole

    that answer compares closely to the textbook answer for P=O in POCl3 of 460 kJ/mol.

    realize that dH's & bond energies varyt from reference to reference, you may have to make adjustments to the calculations using your data tables



  • Question:-Which of the elements: Al, Si, P, S, Cl, or Ar should have the lowest 4th ionization energy?
    Which of the elements: Al, Si, P, S, Cl, or Ar should have the lowest 4th ionization energy?

    Answer:-Silicon.-
  • Question:-Why is a P-Cl bond in a molecule PCl5 is more polar than P-S in a molecule of P2S5?
    In terms of electronegativity.

    Answer:-because Cl is more electronegative than S
  • Question:-What bond angle is the Cl-P-Cl and what Shape arrangement?


    Answer:-PCl3 or PCl5?

    PCl3 = 107 (109.5 - 1 * 2.5 for each lone pair)
    it's trigonal pyramidal

    PCl5 = 90 for axial and 120 for equatorial
    it's trigonal bipyramidal
  • Question:-For PCl6 (-) some of the Cl-P-Cl bonds are 180. What is the angle of the other Cl-P-Cl bonds, in degrees?


    Answer:-not enough info to answer all triangles have to equal 180 you need to know what angles are there and sub for x x1 and x2
  • Question:-In the bond Cl-P the dipole points toward the?
    In the bond Cl-P the dipole points toward the

    Cl or the P?

    Answer:-Cl, because it is more electronegative.
  • Question:-What is K_p at 500 K for the reaction 2NO + Cl_2 <--> 2 NOCl?
    The partial pressures in an equilibrium mixture of NO, Cl_2, and NOCl at 500 K are as follows:
    P_NO = 0.240 atm, P_{Cl_2} = 0.608 atm, P_NOCl = 1.35 atm.

    Answer:-products on top and reactants on the bottom
    take the NOCl concentration to the 2nd power
    divded by
    the reactants NO to the 2nd power and Cl2 to the 1st power
  • Question:-What is the ion for Na,Ca,K,Al,Sr,N,P,Cl,S,Br & I ?
    Can you please give me with the protons & electrons,at least ELECTRONS like this =
    Li => P=3 & E=2
    Thank u !

    Answer:-Ions are Na+, Ca2+, K+, Al3+, Sr2+, N3-, etc.
    It is easy to use the periodic table to work out what you want from there. You should be able to do that as it is simply electrons loss or gain , depending on ion charge.

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