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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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miggybling miggybling
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12 years ago
a. the reaction occurs too quickly to observe
b. the reaction takes too long to observe
c. the reaction releases too much heat
d. the reaction is not possible
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wrote...
#1
12 years ago
I don't really understand the question because Hess's Law can be used to calculate the heat of that reaction. I would agree that at room temperature, b. is a true statement, so if you MUST pick an answer, then b would be the best answer. However, just because the reaction is slow does not mean that Hess's law can't be used to talk about the reaction. Enthalpy changes are fundamentally not related to the rates of reactions.
wrote...
#2
12 years ago
Hess' Law is helpful for the calculation involved. You measure the heat of combustion for graphite and you measure the heat of combustion for diamond. Then, you apply Hess' Law. In fact, this example is the one I choose to use to start my tutorial on Hess' Law:

http://www.chemteam.info/Thermochem/HessLawIntro1.html

I concur in hcbiochem's recommendation to pick answer choice b.
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