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Topic: Is this enthalpy equation correct?  (Read 2136 times)

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Offline Kylash

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Is this enthalpy equation correct?
« on: March 21, 2011, 10:47:34 PM »
Mass of H2O: 100g
Mass of NaOH: 1.547g
Starting Temperature: 23
Final (highest) temperature: 27
c=4.184

My work:
q= (delta t) c m
q= (4)*(4.184)*(100g+1.547g)
q = 1699.49

1.547g of NaOH = .038675 mol of NaOH

1699.49 / .038675 = 43942.872 J

(^^ I assume that final answer is a positive value (because it's endothermic?) and the unit is J?)
Thanks a ton!
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Offline rabolisk

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Re: Is this enthalpy equation correct?
« Reply #1 on: March 21, 2011, 11:30:09 PM »
I have not checked the math, but it appears correct. The unit can be converted to kJ, but it doesn't matter. This is exothermic, not endothermic, though.
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Offline Kylash

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Re: Is this enthalpy equation correct?
« Reply #2 on: March 22, 2011, 03:48:25 PM »
Got it, thank you very much.
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