PS14.Hess'sLaw

Basic Chemistry (Chapters 1-16)

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CHEMISTRY 2001 NAME PROBLEM SET #14: Hess’s Law DATE PERIOD  READ  SECTION  10.8!  1. Define Hess’s Law of heat summation : 2. Calculate the enthalpy change, H (in kJ) for the reaction 2 Al ( s ) + Fe 2 O 3 ( s ) 2 Fe ( s ) + Al 2 O 3 ( s ) H = ? Use the enthalpy changes for the combustion of aluminum and iron: 2 Al ( s ) + 3/2 O 2 ( g ) Al 2 O 3 ( s ) H = –1669.8 kJ 2 Fe ( s ) + 3/2 O 2 ( g ) Fe 2 O 3 ( s ) H = –824.2 kJ 3. Calculate the heat change for the formation of lead (IV) chloride by the reaction of lead (II) chloride with chlorine:
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Unformatted text preview: PbCl 2 ( s ) + Cl 2 ( g ) PbCl 4 ( l ) ∆ H = ? Use the following thermochemical equations: Pb ( s ) + 2 Cl 2 ( g ) PbCl 4 ( l ) ∆ H = –329.2 kJ Pb ( s ) + Cl 2 ( g ) PbCl 2 ( s ) ∆ H = –359.4 kJ 4. From the following reactions: ½ N 2 ( g ) + ½ O 2 ( g ) NO ( g ) ∆ H = +90.4 kJ/mol ½ N 2 ( g ) + O 2 ( g ) NO 2 ( g ) ∆ H = +33.6 kJ/mol determine the heat of reaction for NO ( g ) + ½ O 2 ( g ) NO 2 ( g ) ∆ H = ?...
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This document was uploaded on 06/02/2010.

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