In the laboratory we detected Cv for the calorimeter of kJ/K and Hcombustion for
ID: 574710 • Letter: I
Question
In the laboratory we detected Cv for the calorimeter of kJ/K and Hcombustion for sample in units of kJ*g-1
Why was a bomb calorimeter used in this analysis instead of a coffee-cup calorimeter? Select all that apply. a) A bomb calorimeter is used to measure the heat flow of reactions involving gases. b) A bomb calorimeter is used to measure the heat flow of the reaction which is always equal to the magnitude of the enthalpy change. c) A bomb calorimeter can be pressurized to many atmospheres of pure oxygen to promote rapid and full combustion of the sample. d) In a bomb calorimeter, the reaction takes place in the water. e) A bomb calorimeter is used to measure high temperature reactions.Explanation / Answer
a) c) and e) apply
a) applies as the combustion of a gas can be measured accurately only by a bomb calorimeter. In a coffee the combustion gases escape making the estimation inaccurate.
b) does not apply as the heat flow measured may not be equal to the magnitude of enthalpy change. This is due to the changes in pressure of the bomb.
c) applies as the material of construction of the bomb can withstand a rated pressure.
d) does not apply as the reaction does not take place in water just as in the case of a coffee cup calorimeter.
e) applies as the bomb material of construction can withstand high temperatures whereas in a coffee cup calorimeter, the cup would melt.
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