열역학. How much PV work is done (in kJ)

열역학. How much PV work is done (in kJ)

 

 

Ethyl chloride (C2H5Cl), a substance used as a topical anesthetic, is prepared by reaction of ethylene with hydrogen chloride:

C2H4(g) + HCl(g) → C2H5Cl(g) ... ΔH° = -72.3 kJ

How much PV work is done (in kJ), if 90.0 g of ethylene and 130 g of HCl are allowed to react at atmospheric pressure and the volume change is -71.9 L?

 

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w = -Pext ΔV

( Pext = atmospheric pressure = 1 atm )

 

= -(1) (-71.9) = 71.9 atm•L

( 1 atm•L = 101.3 J )

 

= 71.9 atm•L * (101.3 J / 1 atm•L) = 7283.47 J

= 7.28 kJ

 

 

답: 7.28 kJ