Question on enthalpy change
Attachment not found
for q2b I am unsure how it's worked out.1. How will you be able to deduce that the Mr of coal is just 12 g mol^-1? You are not told the molecular formula for it .
2. The answer suggests that you will work out the heat loss q from the moles of coal * by the enthalpy change of combustion but I don't understand why. Why is q of coal = q of water ?
Thanks
(edited 7 years ago)
The question says assume coal is pure carbon. Carbon is in the periodic table!
Use Q = mcΔT for 2b)
Original post by TeachChemistry
The question says assume coal is pure carbon. Carbon is in the periodic table!
So whenever the question states the the compound is made up of carbon, it is okay to assume that the mr is 12?
Also can you help me with my second question?
Thanks
Original post by TeachChemistry
Use Q = mcΔT for 2b)
I don't really understand why q of the coal equals to q of the water, I always know it as that you would only include the mass of the water in this equation...
Original post by coconut64
I don't really understand why q of the coal equals to q of the water, I always know it as that you would only include the mass of the water in this equation...
You assume that all of the heat released by the coal burning is transferred to the water to heat it up.
Original post by TeachChemistry
You assume that all of the heat released by the coal burning is transferred to the water to heat it up.
Thanks.
Original post by TeachChemistry
You assume that all of the heat released by the coal burning is transferred to the water to heat it up.
Does anybody know how to work this out? It was from the new Aqa Chem AS paper 2016 Thank You
Original post by PBC Gyal
Does anybody know how to work this out? It was from the new Aqa Chem AS paper 2016 Thank You
Does anybody know how to work this out? It was from the new Aqa Chem AS paper 2016 Thank You
Hey I just worked this out but can't find the paper nor the mark scheme, mind telling me the answer ? Cheers
Original post by coconut64
Hey I just worked this out but can't find the paper nor the mark scheme, mind telling me the answer ? Cheers
about -11,760 kJ
Original post by coconut64
Hey I just worked this out but can't find the paper nor the mark scheme, mind telling me the answer ? Cheers
Hey and yes I got around 11570KJ it was the AqaChem new spec done in2016
Original post by TeachChemistry
Use Q = mcΔT for 2b)
Attachment not found
Do you know how to work this out? The last image is the graph for the question above pleaseQuick Reply
Related discussions
- enthalpy change of sol more or less exo
- As level chemistry
- Chemistry Olympiad question
- Chemistry ocr a level enthalpy
- enthalpy change of sol
- Chemistry question- enthalpy of formation
- Chemistry question- energetics
- Hess law and combustion
- Chemistry help pleaseee !!!! 🙏🙏🙏
- Enthaly Change and Hess's Law
- A-level chem enthalpy question
- Enthalpy change
- Energetics Alevel chem multiple choice
- Hess cycle question
- 2Al(s) Fe2O3(s) → Al2O3(s) 2Fe(s), struggling with this question
- Bond Enthalpies Question
- Chemistry help ( please 😭😭 )
- enthalpy change of combustion alchols
- Isaac physics - essential pre-uni chemistry F3.4 question help pls!!!!!!!!!!!!!!!!!!
- Enthalpy change question help !!
Latest
Trending
Last reply 6 days ago
Im confused about this chemistry question, why does it form these productsTrending
Last reply 6 days ago
Im confused about this chemistry question, why does it form these products
