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A student places 125g of liquid water, H201), at 24 °C into a coffee-cup calorimeter, and then adds 10.5g of solid potassium bromide, KBr (s), and 1.6mol of unknown substance, also at 24°C. He stirs the liquid until the potassium bromide and unknown substance fully dissolve, and then determines that the temperature has changed to 19 °C. KBr and unknown substance do not react with each other. of potassium We know that molar enthalpy change for dissolution reaction, AH bromide is 18357J/mol. Calculate the molar enthalpy change for the dissolution reaction of unknown substance, AH `sol · Assume that the specific heat capacity, c, of the liquid in the coffee-cup calorimeter is the same as the specific heat capacity of water, 4.18J/(g°C). sol Hint: 4system 1 + 9system 2 -ąsurrounding Isurrounding = mcAT ΔΗ' -n ΔΗ sol

A student places 125g of liquid water, H201), at 24 °C into a coffee-cup calorimeter, and then adds 10.5g of solid potassium bromide, KBr (s), and 1.6mol of unknown substance, also at 24°C. He stirs the liquid until the potassium bromide and unknown substance fully dissolve, and then determines that the temperature has changed to 19 °C. KBr and unknown substance do not react with each other. of potassium We know that molar enthalpy change for dissolution reaction, AH bromide is 18357J/mol. Calculate the molar enthalpy change for the dissolution reaction of unknown substance, AH `sol · Assume that the specific heat capacity, c, of the liquid in the coffee-cup calorimeter is the same as the specific heat capacity of water, 4.18J/(g°C). sol Hint: 4system 1 + 9system 2 -ąsurrounding Isurrounding = mcAT ΔΗ' -n ΔΗ sol

Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 51E: A sample of 0.562 g of carbon is burned in oxygen in a bomb calorimeter, producing carbon dioxide....
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An energy change called enthalpy of solution, ΔHsol, occurs when a substance dissolves in water.

A student places 125g of liquid water, H,01), at 24 °C into a coffee-cup calorimeter, and then adds 10.5g of solid potassium bromide, KBr (s) , and 1.6mol of unknown substance, also at 24°C. He stirs the liquid until the potassium bromide and unknown substance fully dissolve, and then determines that the temperature has changed to 19 °C. KBr and unknown substance do not react with each other. We know that molar enthalpy change for dissolution reaction, AH bromide is 18357J/mol. Calculate the molar enthalpy change for the dissolution reaction of unknown substance, AH sol· sol of potassium Assume that the specific heat capacity, c, of the liquid in the coffee-cup calorimeter is the same as the specific heat capacity of water, 4.18J/(g°C). Hint: 9system 1+ ąsystem 2 -Asurrounding Isurrounding = MCAT AH° = n AH sol Clearly show your steps!
Transcribed Image Text:A student places 125g of liquid water, H,01), at 24 °C into a coffee-cup calorimeter, and then adds 10.5g of solid potassium bromide, KBr (s) , and 1.6mol of unknown substance, also at 24°C. He stirs the liquid until the potassium bromide and unknown substance fully dissolve, and then determines that the temperature has changed to 19 °C. KBr and unknown substance do not react with each other. We know that molar enthalpy change for dissolution reaction, AH bromide is 18357J/mol. Calculate the molar enthalpy change for the dissolution reaction of unknown substance, AH sol· sol of potassium Assume that the specific heat capacity, c, of the liquid in the coffee-cup calorimeter is the same as the specific heat capacity of water, 4.18J/(g°C). Hint: 9system 1+ ąsystem 2 -Asurrounding Isurrounding = MCAT AH° = n AH sol Clearly show your steps!
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