Principles of General Chemistry
3rd Edition
ISBN: 9780073402697
Author: SILBERBERG, Martin S.
Publisher: McGraw-Hill College
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Question
Chapter 5, Problem 5.87P
(a)
Interpretation Introduction
Interpretation:
The lower flammable limit of n-hexane should be estimated.
Concept Introduction :
Lower flammable limit (LFL) is expressed in volume percent. It is the lower limit of the concentration range which a flammable gas can be ignited at a given temperature and pressure.
(b)
Interpretation Introduction
Interpretation:
Volume of n-hexane required to produce a flammable mixture of hexane in
Concept Introduction :
Lower flammable limit (LFL) is expressed in volume percent. It is the lower limit of the concentration range which a flammable gas can be ignited at a given temperature and pressure.
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Effervescent tablets contain both citric acid (C6H8O7) and sodium bicarbonate
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Combustible vapor-air mixtures are flammable over a limited range of concentrations. The minimum volume % of vapor that gives a combustible mixture is called the lower flammable limit (LFL). Generally, the LFL is about half the stoichiometric mixture, the concentration required for complete combustion of the vapor in air. (a) If oxygen is 20.9 vol % of air, estimate the LFL for n-hexane, C6H14. (b) What volume (in mL) of n-hexane (d 5 0.660 g/cm3) is required to produce a flammable mixture of hexane in 1.000 m3 of air at STP?
5. An experiment is performed to measure the mass percent of CaCO3(s) in eggshells. Five different
samples of CaCO3(s) of known mass react with an excess of 2.0M HCl(aq) in identical sealed, rigid reaction
vessels. The pressure of the gas produced is measured with a pressure gauge attached to the reaction
vessel. Since the reaction is exothermic, the reaction system is cooled to its original temperature before
Cooling the HCl(aq) to a lower temperature than it was in the original experiment
the pressure is recorded. The experimental data are used to create the calibration line below.
Using eggshells that are more finely powdered than those used in the original
experiment
0.10-
0.09
0.08-
Using 2.0M CH3COOH(aq) instead of 2.0M HCl(aq)
0.07
* 0.06-
Reducing the volume of the reaction vessel
0.05
0.04
CLEAR ALL
0.03-
0.02-
0.05
0.10
0.15
0.20
Mass of CaCO3(s) (grams)
The experiment is repeated with an eggshell sample, and the experimental data are recorded in the table
below.
Mass of…
Chapter 5 Solutions
Principles of General Chemistry
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