During a given chemical reaction the surroundings dopressure-volume work on the

Question

During a given chemical reaction the surroundings dopressure-volume work on the reaction system if the reaction iscarried out at constant pressure and temperature. Assuming that thereaction is endothermic, the same reaction at constant volume andtemperature will then

a) release heat to the surroundings
b) take up less heat from the surroundings
c) take up more heat from the surroundings
d) not exchange heat with the surroundings

-> My teacher said the answer is c) because it is endothermic.But I don't understand what making the reaction at constant volumeand temperature (as opposed to constant pressure and temperature)changes things - how does it??

Explanation / Answer

because Cp=Cv+R where Cp Cv are heatcapacities at constant pressure and volume.

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