If i were to get the amount of heat transfer using constant pressure calorimetery, can I...

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Chemistry

If i were to get the amount of heat transfer using constantpressure calorimetery, can I get the amount for the constant volumecalorimetery using that value? Or vice versa?

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We have discussed how we use calorimetry as an experimental methodto determine the heat released or absorbed by a chemical reactionI demonstrated both the coffeecup and the bomb calorimeter Thecoffeecup calorimeter measures the heat released or absorbed in areaction occuring in aqueous solution I did one example showinghow to calculate the heat of a reaction knowing the temperaturechange the mass of the water and the heat capacity of thecalorimeter The bomb calorimeter measured the heat released in acombustion reaction Bomb calorimeters are used to measure the heatof a reactions involving gasesI made two important points during the lecture which I did notdwell on then but which I want to reiterate now There is animportant difference in the heat transferred in the two differenttypes of calorimeters The coffeecup calorimeter measures the heatof a reaction at constant pressure while the bomb calorimetermeasures the heat of a reaction at constant volume Our goal todayis to introduce two important thermodynamic quantities E the internalenergy and the energy associated with a reaction at constant volumeand H the enthalpythe energy associated with a reaction at constant pressureIntroducing and discussing these two quantities is important toreaching our goal of calculating heats of chemical reactionsIn our calorimetry calculations and in several of the problemsin PS10 we take advantage of the 1st Law of Thermodynamics thatenergy is conserved Energy that was lost by the system in anexothermic reaction was absorbed by the surroundings the waterand the calorimeter Now well take a moment to apply some ofthese concepts in the first law of thermodynamics The first lawstates that while energy can be converted from one form to anotherit can not be created or destroyed When a chemical reaction occursenergy lost by the system must be gained by the surroundings andvisa versa This is also known as the law of conservation ofenergyThe energy we are discussing is the sum of all the kinetic andpotential energies of the systems component parts This includesthe motion of the atoms or molecules electrons and nuclei Thistotal energy is called the internal energy of the system We See Answer

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