Constant Pressure vs Constant Volume Calorimeter
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Constant Pressure vs Constant Volume Calorimeter
Can a constant volume calorimeter be used to calculate enthalpy? If so, is it any different than calculations with a constant pressure calorimeter?
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Re: Constant Pressure vs Constant Volume Calorimeter
Enthalpy is defined to be the change of energy under constant pressure. Thus, a constant volume calorimeter can't be used to measure enthalpy.
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Re: Constant Pressure vs Constant Volume Calorimeter
If a constant volume calorimeter cannot be used to calculate enthalpy values, what information can it give us?
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Re: Constant Pressure vs Constant Volume Calorimeter
A constant-volume calorimeter has a fixed volume (only pressure changes). It can be used to measure qv.
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Re: Constant Pressure vs Constant Volume Calorimeter
Constant volume calorimeter is used to calculate qv while a constant-pressure calorimeter is used to calculate qp(or the enthalpy of a reaction)
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Re: Constant Pressure vs Constant Volume Calorimeter
A constant pressure calorimeter can be used to calculate enthalpy, but not a constant volume calorimeter as it is used to calculate qv.
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Re: Constant Pressure vs Constant Volume Calorimeter
Samantha Melin 2E wrote:If a constant volume calorimeter cannot be used to calculate enthalpy values, what information can it give us?
Since this calorimeter has a fixed volume it measures the internal change of energy for a combustion reaction.
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Re: Constant Pressure vs Constant Volume Calorimeter
Enthalpy is the change in energy of a system under a constant pressure. A constant volume calorimeter cannot be used to calculate enthalpy. A constant volume calorimeter can only help us to find the value of Qv.
Re: Constant Pressure vs Constant Volume Calorimeter
With a constant-volume calorimeter only pressure changes so it has a fixed volume.This can be now used to measure qv.
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