chem

posted by .

stilll didn't get it .. .. can u plz explain in detail ... how did u get the answer.. plz plz plz plz plzp l zp

thnks

Bond enthalpy is the energy required to break a mole of a certain type of bond.

O=O = 495 kj/mol
S-F = 327 kj/mol
S=O = 523 kj/mol


Use average bond enthalpies to estimate the enthalpy delta H (rxn) of the following reaction:

2SF4 + O2 ---- 2OSF4

Express your answer numerically in kilojoules.

  • chem -

    Instead of asking me to work the problem step by step it would help if you told us what you don't understand. Not getting it doesn't tell us much. I gave you the formula.
    Delta Hrxn = BEreactants - BEproducts =
    [2*(4*S-F bond)]+ (O=O bond) - [2*(4*S-F bond) + (S=O bond)]= delta Hrxn
    This is a matter of substituting those values for the bonds in the equation above to arrive at the answer. If you still don't understand, post your work showing how you arrived at the 103 value you posted earlier.

  • chem -

    i am getting -28 KJ .. is it rite plz chk

  • chem -

    That isn't what I obtained when I tried it. Show your work and let me see what you are doing wrong (or if I have made an error).

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chem Urgent Help

    Plz explain in detail.... i tried to search on internet but i am confused with co-efficents.. how to set up the equaiton .. plz help me ?
  2. Urgent Chem help plz

    is answer +103 KJ.. plz chk Plz explain in detail.... i tried to search on internet but i am confused with co-efficents.. how to set up the equaiton .. plz help me ?
  3. Plz someone Chem Urgent Help

    The overall energy involved in the formation of CsCl from Cs(s) and Cl2 (g)is - 443 kj/mol. Given the following information: •heat of sublimation for Cs is +76 kj/mol, •bond dissociation energy for ½ Cl2is +121 kj/mol, •E(11) …
  4. I NEED HELP!!:(!!!! HELP ME PLZ!!

    I GOT A FEW QUESTIONS SO what is a cell part that has the funcion of a gel-like material inside cells... and what releases energy into the cell.?
  5. biology

    a boy inherits genes for tallness,but his growth is limited as a result of poor nitrition. this is an example of 1)an inherited disorder. 2)environmental influence on gene expression . 3)expression of a hidden trait 4)a characterstic …
  6. LIVING ENVIRONMENT

    the ability to grow in size is a characteristic of living organism .Although an icicle may grow in size over time,it is considered nonliving because there is 1)an incerase in matter ,but no increase in the number of icicle. 2)an interaction …
  7. math

    identify the value of x that makes each pair of the ratios equivalent x:4 and 45:20 A.8 B.9 C.10 plz plz plz plz help me!!!!!!!! PLZ!!!!!
  8. SS PLZ HELP ME ASAP

    What are the two major forces that shape and reshape earth?
  9. SS plz help me plzzzzzzz

    What are the two major forces that reshape earth?
  10. math plz plz plz plz help plz .....thank you

    mark bought a notebook for $1.45 and some pencils that cost $0.42 each if the total cost was 6.91,how many pencils did he buy A.12 B.13 C.14 D.15 is 14 the answer plz help thank you

More Similar Questions