heat transfer, enthalpy change, and molar enthalpy

what is enthalpy change

the energy absorbed from it released to the surroundings when a system changes from reactants to products

what is the symbol to study enthalpy change?

delta h /\Delta H

what are other terms used tk represent enthalpy change

enthalpy of reaction, heat of reaction, change in heat content, enthalpy change and delta h

what is the equation for enthalpy change

\Delta Hsystem=\pm Qsurroundings

what is molar enthalpy

the enthalpy change per mole of a substance undergoing a change

negative enthalpy changes

exothermic reaction (release of heat)

positive enthalpy change

endothermic reaction (absorption of heat)

what is the formular for molar enthalpy

\Delta H=n\Delta Hx

what is the first simplifying assumptions often used in calorimetry

no heat is transferred between calorimeter and the outside environment

what is the second simplifying assumptions often used in calorimetry

any heat absorbed or released by the calorimeter materials such as the container is negligible

what is the third simplifying assumptions often used in calorimetry

a dilute aqueous solution is assumed to have a density of specific capacity equal to that of pure water