A student runs two experiments with a constant-volume "bomb" calorimeter containing 1200. g of water (see sketch at right). First, a 6.000 g tablet of benzolc acid (C6HCO₂H) 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 48.49 °C over a time of 7.5 minutes. Next, 6.000 g of ethane (C₂H6) 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 67.90 °C, Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: stimer 4 themometer chemical reaction "bomb" A "bomb" calorimeter. water insulation 2C₂H6(8) +70₂(8) 4CO₂(8) + 6H₂0(8) 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 alues you

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A student runs two experiments with a constant-volume "bomb" calorimeter containing
1200. g of water (see sketch at right).
First, a 6.000 g tablet of benzolc acid (C6HCO₂H) 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 48.49 °C over
a time of 7.5 minutes.
Next, 6.000 g of ethane (C₂H6) 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 67.90 °C.
Use this information, and any other information you need from the ALEKS Data resource, to
answer the questions below about this reaction:
4
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 AH, rxn per mole of C₂H6-
O exothermic
endothermic
neither
kJ
2C₂H6(8) +70₂(8) 4CO₂(8) + 6H₂0(8)
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.
kJ
0:
stimer
mol
themometer
chemical reaction
"bomb"
A "bomb" calorimeter.
0.9
X
water
5 ?
insulation
GO
Transcribed Image Text:A student runs two experiments with a constant-volume "bomb" calorimeter containing 1200. g of water (see sketch at right). First, a 6.000 g tablet of benzolc acid (C6HCO₂H) 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 48.49 °C over a time of 7.5 minutes. Next, 6.000 g of ethane (C₂H6) 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 67.90 °C. Use this information, and any other information you need from the ALEKS Data resource, to answer the questions below about this reaction: 4 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 AH, rxn per mole of C₂H6- O exothermic endothermic neither kJ 2C₂H6(8) +70₂(8) 4CO₂(8) + 6H₂0(8) 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. kJ 0: stimer mol themometer chemical reaction "bomb" A "bomb" calorimeter. 0.9 X water 5 ? insulation GO
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