A student runs two experiments with a constant-volume "bomb" calorimeter containing 1100. g of water (see sketch at right). First, a 5.000 g tablet of benzoic acid (C6H5CO₂H) 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 17.00 °C to 41.54 °C over a time of 8.1 minutes. Next, 5.510 g of ethylene (C₂H4) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 17.00 °C to 63.77 °C. Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: C₂H4(g) + 30₂(g) → 2CO₂(g) + 2H₂O (8) 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 O endothermic Oneither kJ 0 kJ mol I stirrer 0 thermometer chemical reaction "bomb" A "bomb" calorimeter. water insulation.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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A student runs two experiments with a constant-volume "bomb" calorimeter containing 1100. g of water (see sketch at
right).
First, a 5.000 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 17.00 °C to 41.54 °C over a time of 8.1 minutes.
Next, 5.510 g of ethylene (C₂H4) are put into the "bomb" and similarly completely burned in an excess of oxygen.
This time the temperature of the water rises from 17.00 °C to 63.77 °C.
Use this information, and any other information you need from the ALEKS Data resource, to answer the questions
below about this reaction:
C₂H₂(g) + 30₂(g) → 2CO₂(g) + 2H₂O(g)
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
O endothermic
Oneither
KJ
0
kJ
mol
stirrer
0
thermometer
chemical reaction
"bomb"
"bomb" calorimeter.
water
insulation
match
Transcribed Image Text:A student runs two experiments with a constant-volume "bomb" calorimeter containing 1100. g of water (see sketch at right). First, a 5.000 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 17.00 °C to 41.54 °C over a time of 8.1 minutes. Next, 5.510 g of ethylene (C₂H4) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 17.00 °C to 63.77 °C. Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: C₂H₂(g) + 30₂(g) → 2CO₂(g) + 2H₂O(g) 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 O endothermic Oneither KJ 0 kJ mol stirrer 0 thermometer chemical reaction "bomb" "bomb" calorimeter. water insulation match
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