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CHEM 107
Review
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Experiment 6
exp6
Enthalpy
•
E = total energy
•
q = heat
•
w = work = Δ(PV) = PΔV (at constant P)
•
ΔE = q – PΔV
•
Use H = E + PV
=>>
ΔH = ΔE + Δ(PV)
•
Finally,
ΔH = q – PΔV + PΔV = q
exp6
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View Full Document 1. Calculating the Heat Capacity
2. Calculating the heat (Enthalpy)
4.03 J g1
oC1
[
Mass of HCl
added
Mass of
unknown g
[
+
= Cp
sys
= Cp sys
ΔT
qsyste
m
= Cp cal
ΔT
qcalorim
eter
Δ
H
=
qsystem +
qcalorimeter
# grams of
unknown
exp6
Example : # 6
Sometimes, the heat for system is given. Therefore
Calculate the heat for calorimeter and sum of both heat.
3. Calculating
∆
H per gram
Cp cal is
given
Temp
(oC)
Time (min)
No data on 4th
minute
ΔT
exp6
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Experiment 7
exp7
Calculations
1.
Calculate PN2 (= Ptotal – PH2O)
2.
Calculate the moles of N2
–
Remember converting
•
Torr => atm, celcious => K, mL => L
•
R = 0.08206 L atm/mol K
3.
Calculate the moles of NaNO2
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This note was uploaded on 04/07/2011 for the course CHEM 107 taught by Professor Staff during the Winter '08 term at BYU.
 Winter '08
 Staff
 Enthalpy

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