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### Topic: Please use the experimental values to calculate the enthalpy change  (Read 2983 times)

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#### Frederick95

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##### Please use the experimental values to calculate the enthalpy change
« on: March 07, 2008, 10:09:07 PM »
I have one more question that I would really like help with I have been spending about 3 days on this question alone and remain stumped

Use the experimental values to calculate the enthalpy change

Given
Quantity of reactant 1: 5.61 g KOH(s)
Quantity of reactant 2: 200.0 mL of 0.50 M HBr(aq)
Initial Temperature (oC): 20.0
Final Temperature (oC): 26.7

Required
ΔH = ?

My work thus far
ΔT = tf – ti
= 26.7 oC - 20.0 oC
= 6.7 oC

#### Yggdrasil

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##### Re: Please use the experimental values to calculate the enthalpy change
« Reply #1 on: March 08, 2008, 02:30:10 PM »
Do you know what formula to use in order to calculate the amount of heat produced?  (note: you can assume that the solution has the same specific heat capacity as pure water).

Also, to calculate the molar change in enthalpy, you need to calculate the number of moles of the limiting reagent (and a good place to start there is with a balanced chemical reaction).