1) If an error is made in the determination of the calorimeter constant, it caus
ID: 1060492 • Letter: 1
Question
1) If an error is made in the determination of the calorimeter constant, it causes problems in the determination of the specific heat of the metal and AHneutralization. Using the values given in the worked example in the Procedure for the case of neutralization, let us examine the effect that an error in Coal has on subsequent determinations. Done correctly, the data was: q solution qcalorimeter qnn 0 4.184 J/(g oC)](100. ml)(1.00 g/ml (31.9-22.1) oC 35.6 J/ oC (31.9 22.1) oC) (AHnan)(1.50 mol/1000 ml)(50.0 m)) 0 4100.32 J 348.88 J (AHnen) (0.0750 mol) 0 -4449.20 J (AHrxn (0.0750 mol) qrkn 59,322.7 J/mol AHmn -59.3 kJ/mol AH determination was 5.56% high.Explanation / Answer
Assume Qcalorimter = 0
so
Qsolution + Qcalorimter + Qrxn = 0
4.184*(100)*1 (31.9-22.1) + 0 + HRxn*(1.5/1000)(50) = 0
4100.32 + 0.075Hrxn = 0
HRxn = -4100.32/0.075 = -54670.93 J/mol = -54.67 kJ/mol
Error % = 56.2-54.67)/56.2 *100 = 2.722%
it is slightly lower, actually pretty acceptable
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