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A student dissolves 14.3 g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.4 °C over the course of 8.7 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: + NaOH(s) → Na (aq) + OH (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? exothermic ☐ x10 endothermic Х O O O If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of NaOH. rxn neither □kJ ☐ kJ mol

A student dissolves 14.3 g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.4 °C over the course of 8.7 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: + NaOH(s) → Na (aq) + OH (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? exothermic ☐ x10 endothermic Х O O O If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of NaOH. rxn neither □kJ ☐ kJ mol

Chemistry & Chemical Reactivity
Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 108SCQ
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A student dissolves 14.3 g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.4 °C over the course of 8.7 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: + NaOH(s) → Na (aq) + OH (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? exothermic ☐ x10 endothermic Х O O O If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of NaOH. rxn neither □kJ ☐ kJ mol
Transcribed Image Text:A student dissolves 14.3 g of sodium hydroxide (NaOH) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 38.4 °C over the course of 8.7 minutes. Use this data, and any information you need from the ALEKS Data resource, to answer the questions below about this reaction: + NaOH(s) → Na (aq) + OH (aq) You can make any reasonable assumptions about the physical properties of the solution. Be sure answers you calculate using measured data are rounded to the correct number of significant digits. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction. Is this reaction exothermic, endothermic, or neither? exothermic ☐ x10 endothermic Х O O O If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case. Calculate the reaction enthalpy AH per mole of NaOH. rxn neither □kJ ☐ kJ mol
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