# What is the term used for a well insulated reaction vessel used to measure delta H of reactions?

Often the determination of the enthalpy of reaction can be done in a coffee-cup calorimeter, otherwise known as a constant-pressure calorimeter.

This device is often well-insulated so that we can rightfully say,

#q_(soln) ~~ -q_(rxn)#

That is,

At *constant pressure*, the heat flow through the solution, *equal* to the enthalpy of solution,

This heat flow came out into the solution *due to* the reaction, so by conservation of energy,

#color(blue)(q_(soln)/(n_("product")) = -DeltabarH_(rxn))# ,for the relationship through which one can find the enthalpy of a reaction that occurs in a solution inside the coffee-cup calorimeter, where

#n_("product")# is the mols of the reaction product.For the solution heat flow, we write:

#q_(soln) = m_(soln)C_(soln)DeltaT# ,and we often approximate the solution heat capacity

#C_(soln)# as the heat capacity of water, i.e.#C_(soln) ~~ "4.184 J/g"^@ "C"# .The mass of the solution,

#m_(soln)# , is generally approximated by knowing its volume (by measurement!) and assuming the density of the solution is that of water,#"1 g/mL"# .Thus, by measuring the temperature change in the solution, and knowing how much solution was measured out, one can determine

#q_(soln)# and consequently determine#DeltaH_"rxn"# .

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The term used for a well-insulated reaction vessel used to measure the change in enthalpy (ΔH) of reactions is a calorimeter.

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