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III. Data Pengamatan
Suhu ruang awal 24,7oC
A. Penentuan Kapasitas Kalor KalorimeterMasa asam benzoat =1,01 gPanjang kawat awal = 12 cmPanjang kawat akhir = 7,6 cmVolume titrasi =8,44 mLKonsentrasi larutan Na2CO3 = 0,0721 N
Menit ke - Suhu (oC)0 25,011 26,902 27,603 27,774 27,825 27,846 27,847 27,858 27,85
B. Penentuan Kalor Pembakaran ZatMassa naftalena = 0,98 gPanjang kawat awal = 12 cmPanjang kawat akhir = 8,4 cm Volume titrasi = 16,3mLKonsentrasi Na2CO3 = 0,0721 N
Menit ke - Suhu (oC)0 25,821 28,902 29,723 29,854 29,905 29,90
IV. Pengolahan Data
A. Penentuan Kapasitas Kalor Kalorimetera. Faktor koreksi asam nitrat (U1)
U1 = VNA2CO3 . 1 kal/mL = 8,44mL. 1kal/mL = 8,44 kal
b. Faktor koreksi pembakaran kawat (U2)U2 = ΔL. 2,3 kal/cm = (12cm-7,6cm) . 2,3kal/cm = 4,4 cm. 2,3 kal/cm = 10,12 kal
c. Kapasitas kalor (ΔUt= -6318 kal/gr)
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C =−(ΔUt x massaasambenzoat )−U 1−U 2
ΔT
=−(−6318kalg
.1,01 g)−8,44 kal−10,12kal(27,85−25,01 )
= 6362,53kal2,84
=2240,327kal/oC
B. Penentuan Kalor Pembakaran Zata. Faktor koreksi asam nitrat (U1)
U1 = VNA2CO3 . 1 kal/mL = 16,3mL. 1kal/mL = 16,3 kal
b. Faktor koreksi pembakaran kawat (U2)U2 = ΔL. 2,3 kal/cm = (12cm-8,4cm) . 2,3kal/cm = 3,6 cm. 2,3 kal/cm = 8,28 kal
c. Kalor
ΔUt = −(C .∆T )−U 1−U 2
m
=−(2240,327 kaloC . (29,9−25,82 ))−16,3kal−8,28kal
0,98g
= −9165,114 kal
0,98 g=−9352,157 kal
gd. Penentuan Entalpi Naftalena
ΔH = ΔUt + ΔnRT = -9352,157 kal/g +
e. Persentase kesalahan
%Galat =ΔHliteratur – ΔHhitung
ΔHliteratur.100%
=