Is this reaction exothermic, endothermic, or 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 AHxn per mole of CO₂. exothermic endothermic 0 neither KJ kJ mol

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Chapter9: Energy And Chemistry
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Problem 9.104PAE: 9.104 An engineer is using sodium metal as a cooling agent in a design because it has useful thermal...
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A student runs two experiments with a constant-volume "bomb" calorimeter containing 1300. g of water (see sketch at
right).
First, a 8.000 g tablet of benzoic acid (C6H-CO₂H) 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 kJ/g.) The temperature of the water is
observed to rise from 13.00 °C to 47.64 °C over a time of 10.6 minutes.
Next, 5.070 g of ethanol (C₂H5OH) are put into the "bomb" and similarly completely burned in an excess of oxygen.
This time the temperature of the water rises from 13.00 °C to 36.79 °C.
Use this information, and any other information you need from the ALEKS Data resource, to answer the questions
below about this reaction:
Is this reaction exothermic, endothermic, or 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 AHxn per mole of CO₂.
I Don't Know
Submit
C₂H₂OH(1) + 30₂(g)
2CO₂(g) + 3H₂O(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
O endothermic
O neither
kJ
stirrer
kJ
mol
chemical reaction
0
thermometer
"bomb"
A "bomb" calorimeter.
☐x10
x
water
insulation
3 ?
olo
Ar
Transcribed Image Text:A student runs two experiments with a constant-volume "bomb" calorimeter containing 1300. g of water (see sketch at right). First, a 8.000 g tablet of benzoic acid (C6H-CO₂H) 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 kJ/g.) The temperature of the water is observed to rise from 13.00 °C to 47.64 °C over a time of 10.6 minutes. Next, 5.070 g of ethanol (C₂H5OH) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 13.00 °C to 36.79 °C. Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: Is this reaction exothermic, endothermic, or 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 AHxn per mole of CO₂. I Don't Know Submit C₂H₂OH(1) + 30₂(g) 2CO₂(g) + 3H₂O(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 O endothermic O neither kJ stirrer kJ mol chemical reaction 0 thermometer "bomb" A "bomb" calorimeter. ☐x10 x water insulation 3 ? olo Ar
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