230_F13_L09_enthalpy3_post

261 kjg cs h2ol 4184 jgoc cs h2og 209 jgoc the

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Unformatted text preview: 3 + 15 g * 4.184 o * (Tf " 0) o C = "200 g * 4.184 o * (Tf " 25) o C g gC gC o Tf = 17.7 C Thermodynamics of vaporizing/condensing ΔHvap: enthalpy (heat) of vaporizaRon *measured at Tb not 298K Constant temperature and pressure (constant pressure) (constant pressure) Thermodynamics of MelRng and Freezing ΔHfus: enthalpy of fusion latent heat of fusion specific melRng heat *measured at Tm not 298K Constant pressure Constant temperature (constant pressure) (constant pressure) Problem 2 ΔHvap H2O = 2.261 kJ/g Cs, H2O(l) = 4.184 J/goC Cs, H2O(g) = 2.09 J/goC The heat from the reacRon: 2 Al(s) + 6 HBr(aq)  2 AlBr3(aq) + 3 H2(g) ΔH =  ­1061 kJ is all transferred to water that is iniRally at 25oC....
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This note was uploaded on 02/13/2014 for the course CHEM 230 taught by Professor Sharp during the Winter '08 term at University of Michigan.

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