A student runs two experiments with a constant-volume "bomb" calorimeter containing 1400. g of water (see sketch at right). thermometer stirrer First, a 7.000 g tablet of benzoic acid (C,H,CO,H) is put into the "bomb" and burned completely in an excess of water 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 23.00 °C to 51.14 °C over a time of 14.5 minutes. insulation Next, 5.790 g of ethane (C,H,) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 23.00 °C to 68.57 °C. chemical reaction "bomb" 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. 2C,H,(g) + 70,(g) 4Co,(g) + 6H,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 O 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. kJ Calculate the reaction enthalpy AH per mole of H,O. mol

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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A student runs two experiments with a constant-volume "bomb" calorimeter containing 1400. g of water (see sketch at
right).
thermometer
atire
First, a 7.000 g tablet of benzoic acid (C,H,CO,H) is put into the "bomb" and burned completely in an excess of
water
oxygen. (Benzoic acid is known to have a heat of combustion of 26.454 kJ/g.) The temperature of the water is
insulation
observed to rise from 23.00 °C to 51.14 °C over a time of 14.5 minutes.
Next, 5.790 g of ethane (C,H,) are put into the "bomb" and similarly completely burned in an excess of oxygen. This
time the temperature of the water rises from 23.00 °C to 68.57 °C.
chemical reaction
"bomb"
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.
2C,H, (g) + 70,(g)
4CO,(g) + 6 H,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
O 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.
kJ
Calculate the reaction enthalpy AH per mole of H,O.
mol
回 国
Transcribed Image Text:A student runs two experiments with a constant-volume "bomb" calorimeter containing 1400. g of water (see sketch at right). thermometer atire First, a 7.000 g tablet of benzoic acid (C,H,CO,H) is put into the "bomb" and burned completely in an excess of water oxygen. (Benzoic acid is known to have a heat of combustion of 26.454 kJ/g.) The temperature of the water is insulation observed to rise from 23.00 °C to 51.14 °C over a time of 14.5 minutes. Next, 5.790 g of ethane (C,H,) are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 23.00 °C to 68.57 °C. chemical reaction "bomb" 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. 2C,H, (g) + 70,(g) 4CO,(g) + 6 H,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 O 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. kJ Calculate the reaction enthalpy AH per mole of H,O. mol 回 国
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