CHEM 1201 Chapter : Chapter 5 Page 90
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1roo(lqe ((\ (,g" e n e r ~ Ie a \l e s s (j sf ern: Enthalpy change~ all = heat transferred at constant pressure (q ) "-. __. ,note: each process has a all which can be measured ({v()m me po rnt of. Ie thermochemical reaction equation (chern 1201 & 1202) The negative sign means that the system lost the heat energy to the surroundings this reaction is exothermic. \. __;eneral rules for enthalpy changes, ahrxn: ml values are numerically the same, but the signs are opposite, for chemical reactions that are the reverse of each other. eylerq4 qdej (1"1 to tyle j4sterr1. Endothermic: the change in enthalpy is directly proportional to the quantity. 11 h ~ - a?, s. ~ "-j. E)tothermil of material undergoing a change (stoichiometry of heat changes): If 2. 00 moles of water are used: If 0. 125 moles of water are used:
