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# te2 (1) - 1 YORK UNIVERSITY NAME F2010 SC/CHEM 2011.03 Test...

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1 YORK UNIVERSITY NAME: F2010 SC/CHEM 2011.03 STUDENT NO. Test # 2 Friday November 19, 2010 50 minutes 6 questions /25 marks Calculators are allowed. No documentation allowed. 1. The Redlich-Kwong equation of state is this: P = RT V m b a V m ( V m + b ) T /2 (1-a) Give the SI units in which “ a ” and “ b ” are expressed. Note : 1 Pa = 1 kgm 1 s 2 . /2 (1-b) Derive an expression for the internal pressure, ( ∂U/∂V m ) T , of a gas that obeys the Redlich-Kwong equation of state.

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2 /5 2. On the Pauling scale, the electronegativity is 2.20 for H and 3.44 for O. A few bond energies are given below, and Pauling’s formula can be found on the last page. Bond energies (kJ/mol): H—H 432 O—O 142 O=O 494 Estimate Δ U rxn and Δ H rxn at 298 K for 2 H 2 ( g ) + O 2 ( g ) −→ 2 H 2 O ( )
3 /4 3. The defining equation for an infinitesimal change of entropy is dS = dq rev T (1) A commonly used equation for the entropy change associated with a phase transition is Δ S tr = Δ H tr T tr (2)

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