5. A sample of a solid organic is completely combusted in a calorimeter. The heat generated by combustion is transferred to the water, causing the temperature of the water to increase. Based the date in the table below, which of the following is the best estimate of the heat of combustion, AHomb, of the organic solid? (The specific heat of water is 4.2 J/g°C)
5. A sample of a solid organic is completely combusted in a calorimeter. The heat generated by combustion is transferred to the water, causing the temperature of the water to increase. Based the date in the table below, which of the following is the best estimate of the heat of combustion, AHomb, of the organic solid? (The specific heat of water is 4.2 J/g°C)
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Transcribed Image Text:5. A sample of a solid organic is completely combusted in a calorimeter. The heat
generated by combustion is transferred to the water, causing the temperature of the water to
increase. Based the date in the table below, which of the following is the best estimate of
the heat of combustion, AH.combs of the organic solid? (The specific heat of water is
4.2 J/g°C)
Mass of
Mass of
AT
water
Solid
Water
1.0 g
2000.0 g
+ 2.1°C
(A) +18 kJ/mol
(B) +8.4 kJ/mol
(C) -8.4 kJ/mol
(D) -18 kJ/mol
6. Below is the heating curve for methane, CH. How much energy is required to melt 64
grams of methane at 90 K? (The molar mass of methan is 16 g/mol.)
150
140-
130
120
110
100
AH-82 kl/mol
of
-AH0.94 kJ/mol-
90
E 80
5 70
60
50
40
30
20
10
Heat Added
(A) 0.24 kJ
(В)
3.8 kJ
(C)
33 kJ
(D)60, kJ
Temperature (K)
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