Why is the energy content of (bio)ethanol so low? Does it have something to do with the hydroxyl groups being able to bond with water?
Pure bioethanol is exactly the same as pure ethanol - doesn't matter how that chemical was made, a chemical is a chemical. However, due to the way bioethanol is produced, it is normally contaminated with other products, thus reducing the amount of energy per gram - it's just that there's less ethanol in each portion in the first place.
If someone could help me with this question
Change in enthalpy/entropy = products - reactants (EDIT: had this the wrong way before - it's fixed now)
Hi,
For this question: for part b, why is the reducing agent SO2 and not the S4+ in SO2 and likewise for parts c and d when i checked the answers, they had the compound instead of the ions?
(Image removed from quote.)
Thank you!
Firstly - you are correct in identifying that S is oxidised from +4 to +6. However, S is not the chemical that caused the O
2 to be reduced from 0 to -2. Reducing and oxidising agents must be a chemical that causes a change - it doesn't matter which part of the chemical underwent the change, the whole chemical is the agent. Hence, SO
2 is the reducing agent, even though it's the sulfur specifically that changed its oxidation state and was oxidised.