A student runs two experiments with a constant-volume "bomb" calorimeter containing 1300. g of water (see sketch at right). thermometer Mim First, a 6.500 g tablet of benzoic acid (C,H,CO,H) is put into the "bomb" and burned completely in an excess of oxygen. (Benzoic acid is known to have a heat of combustion of 26.454 k/g.) The temperature of the water is observed to rise from 21.00 "C to 51.76 "C over a time of 12.3 minutes. water insulat Next, 5.880 g of ethanol (C,H,OH) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 21.00 C to 46.93 °C. chemical reaction Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: A "bomb" calorimeter. C,H,OH() + 30,6) - 200,e) + 3H,0 (2) Be sure any of your answers that are calculated from measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do these experiments sufficiently carefully, and the values you calculate may not exactly match published values for this reaction. O exothermic Is this reaction exothermic, endothermic, or neither? endothermic neither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in the second experiment. Calculate the reaction enthalpy AH per mole of C,H,OH. n kJ
A student runs two experiments with a constant-volume "bomb" calorimeter containing 1300. g of water (see sketch at right). thermometer Mim First, a 6.500 g tablet of benzoic acid (C,H,CO,H) is put into the "bomb" and burned completely in an excess of oxygen. (Benzoic acid is known to have a heat of combustion of 26.454 k/g.) The temperature of the water is observed to rise from 21.00 "C to 51.76 "C over a time of 12.3 minutes. water insulat Next, 5.880 g of ethanol (C,H,OH) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 21.00 C to 46.93 °C. chemical reaction Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: A "bomb" calorimeter. C,H,OH() + 30,6) - 200,e) + 3H,0 (2) Be sure any of your answers that are calculated from measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do these experiments sufficiently carefully, and the values you calculate may not exactly match published values for this reaction. O exothermic Is this reaction exothermic, endothermic, or neither? endothermic neither If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in the second experiment. Calculate the reaction enthalpy AH per mole of C,H,OH. n kJ
Chemistry by OpenStax (2015-05-04)
1st Edition
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Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 80E: Ethanol, C2H5OH, is used as a fuel for motor vehicles, particularly in Brazil. (a) Write the...
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Concept explainers
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Question
Transcribed Image Text:A student runs two experiments with a constant-volume "bomb" calorimeter containing 1300. g of water (see sketch at
right).
thermometer
stim
First, a 6.500 g tablet of benzoic acid (C,H,CO,H) is put into the "bomb" and burned completely in an excess of
oxygen. (Benzoic acid is known to have a heat of combustion of 26.454 k/g.) The temperature of the water is
observed to rise from 21.00 "C to 51.76 °C over a time of 12.3 minutes.
water
insulation
Next, 5.880 g of ethanol (C,H,OH) are put into the "bomb" and similarly completely burned in an excess of oxygen.
This time the temperature of the water rises from 21.00 °C to 46.93 °C.
chemical reaction
Use this information, and any other information you need from the ALEKS Data resource, to answer the questions
below about this reaction:
"bomb
A "bomb" calorimeter.
C,H,OH() + 30,2) - 200,2) + 3H,0 (g)
Be sure any of your answers that are calculated from measured data are rounded to the correct number of significant digits.
Note for advanced students: it's possible the student did not do these experiments sufficiently carefully, and the values you calculate may not exactly match
published values for this reaction.
O exothermic
Is this reaction exothermic, endothermic, or neither?
O endothermic
neither
if you said the reaction was exothermic or endothermic, calculate the amount of heat that was
released or absorbed by the reaction in the second experiment.
Calculate the reaction enthalpy AH per mole of C,H,OH.
kJ
Fam
mol
Explanatinn
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