Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Question
Chapter 31, Problem 31.6QAP
Interpretation Introduction
Interpretation:
The cause of the immersion of thermocouple inside the sample directly is to be evaluated.
Concept introduction:
Determination properties of materials are done on the basis of change of temperature and it is known as thermal analysis. Many methods are there as example DAE or DTA etc.
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6. A volatilization gravimetry experiment was conducted on an unknown organic liquid
(presumed to only contain carbon, hydrogen, and oxygen). The liquid was massed (data in
the first column below) and then combusted in an excess of oxygen. The exhaust gas was
passed through a trap containing drierite and then through a trap containing ascarite. The
starting and ending masses of the drierite and ascarite were used to obtain the data in the
second two columns below.
Mass Unknown
12.4370
12.5590
12.2230
Mass CO2
17.0822
17.2497
16.7882
Mass H₂O
13.9849
14.1221
13.7443
A.) Calculate the mass percent of carbon, hydrogen, and oxygen in the unknown liquid. There
are no outliers, so you can average the data before processing, if you wish.
B.) Calculate the empirical formula of the unknown compound.
Mark the correct answer
5. The generation of heat by chemical reaction is due to
a) heat input that increases the internal energy of the reactants
b) the change of phases from solids to liquids or gases during the reaction.
c) the enthalpy change of the system
d) the high thermal conductivity of the reagents
6. The material balance for a substance in a system The generation-consumption term
a) It is considered when the reaction is homogeneous and takes place within the system
b) appears when the chemical reaction is heterogeneous
c) is practically zero since reaction rates are always slow
d) is always zero, because matter cannot be created or destroyed
Chapter 31 Solutions
Principles of Instrumental Analysis
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