Hess's Law and Enthalpy Change
Attachment not found
Why is my cycle wrong? The answer doesn't match if I use this cycle.
Thanks for any help in advance!
Original post by 123PC
Why is my cycle wrong? The answer doesn't match if I use this cycle.
Thanks for any help in advance!
Attachment not found
Why is my cycle wrong? The answer doesn't match if I use this cycle.
Thanks for any help in advance!
Can't read it without getting a crick in my neck ... so I won't
Original post by charco
Can't read it without getting a crick in my neck ... so I won't
Original post by 123PC
Rotated version!
Write out the relevant equations:
equation 1: S8(s) + 8O2(g) --> 8SO2(g) ............ -2376 kJ
equation 2: S8(s) --> 8S(g) ............................................................ +2232 kJ
equation 3:O2(g) --> 2O(g) ............................................................ +496 kJ
equation 1 can go via the elements in single atomic state (gaseous)
S8(s) + 8O2(g) --> 8S + 16O ................ +2232 + 8(496) = 6200 kJ
Then to go to 8SO2 is -16 x S=O bond enthalpy
So
-2376 = 6200 - 16(S=O)
rearrange
16(S=O) = 6200 + 2376 = 8576
Hence S=O bond enthalpy = 8576/16 = 536 kJ
Original post by charco
Write out the relevant equations:
equation 1: S8(s) + 8O2(g) --> 8SO2(g) ............ -2376 kJ
equation 2: S8(s) --> 8S(g) ............................................................ +2232 kJ
equation 3:O2(g) --> 2O(g) ............................................................ +496 kJ
equation 1 can go via the elements in single atomic state (gaseous)
S8(s) + 8O2(g) --> 8S + 16O ................ +2232 + 8(496) = 6200 kJ
Then to go to 8SO2 is -16 x S=O bond enthalpy
So
-2376 = 6200 - 16(S=O)
rearrange
16(S=O) = 6200 + 2376 = 8576
Hence S=O bond enthalpy = 8576/16 = 536 kJ
equation 1: S8(s) + 8O2(g) --> 8SO2(g) ............ -2376 kJ
equation 2: S8(s) --> 8S(g) ............................................................ +2232 kJ
equation 3:O2(g) --> 2O(g) ............................................................ +496 kJ
equation 1 can go via the elements in single atomic state (gaseous)
S8(s) + 8O2(g) --> 8S + 16O ................ +2232 + 8(496) = 6200 kJ
Then to go to 8SO2 is -16 x S=O bond enthalpy
So
-2376 = 6200 - 16(S=O)
rearrange
16(S=O) = 6200 + 2376 = 8576
Hence S=O bond enthalpy = 8576/16 = 536 kJ
Thanks!
Quick Reply
Related discussions
- Hess law and combustion
- Bond enthalpies question-help pls
- enthalpy change of combustion alchols
- As level chemistry
- Chemistry question- energetics
- Enthaly Change and Hess's Law
- Chemistry ocr a level enthalpy
- enthalpy change for combustion?
- Lattice enthalpy A2 chem question!
- A-level chem enthalpy question
- energetics a level chem help!
- chemistry a level ocr question
- Hess cycle question
- A-Level energetics!
- Energetics chem question
- Calculating the standard enthalpy change for the following reaction:
- Enthalpy change question
- Help. Enthalpy question
- Bond Enthalpies Question
- chem help
Latest
Last reply 1 minute ago
Haven't heard back from LSELast reply 3 minutes ago
GCSE Maths - Get help and advice from an ex-tutor who specialised in GCSE Maths.Last reply 7 minutes ago
Anyone got an offer for medicine with an access to HE course?Posted 10 minutes ago
Changes to UoB term dates and assessment period questionsLast reply 11 minutes ago
Children to no longer be prescribed puberty blockers, NHS England confirmsLast reply 15 minutes ago
Official Cambridge Postgraduate Applicants 2024 ThreadLast reply 16 minutes ago
Muslim girl who is unsure if she wants to wear hijabLast reply 18 minutes ago
Official London School of Economics and Political Science 2024 Applicant ThreadLast reply 18 minutes ago
Official: University of Bristol A100 2024 Entry ApplicantsPosted 19 minutes ago
Barclays Graduate Scheme with Graduate Visa
