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Arii_bell Arii_bell
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9 years ago
The question is based around a lab, that I watched through a multimedia presentation.
The first question of the assignment is:
1) Calculate the molar enthalpy of NaOH(aq) using the data obtained form this experiment. Show all work.

Molar mass= 40g/mol
mass of NaOH= 50g
Therefore the amount of moles would be 1.25mol

nH=mcDELTAt
H=mcDELTAt/-n
H=(50g* 4.19J/g.degrees celsuis* (32.9-24.1)degrees celsuis)/-1.25
H=-1474.88J

I believe I have done this one correct but if not feel free to correct.
The second question is the one I'm struggling on.
2) The accepted molar enthalpy of neutralization of sodium hydroxide is -57kJ/mol. Calculate the oercent difference of the value you obtained from your experiment with this accepted value.
I have looked for some examples online and in my textbook and I don't find any that give a good place to start. Any help would be greatly appreciated.
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bio_manbio_man
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Arii_bell Author
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#2
9 years ago
Thanks! That helped make it so much easier!!
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