The kinetic-molecular theory states that ideal gas molecules A. are in constant, rapid, random motion. B. have mass and take up space. C. exert forces of attraction and repulsion on each other. D. have high densities compared with liquids and solids.
Coupled Reactions • ex. Cu2S(s)—>2Cu(s) + S(s) —∆Grxn=86.2 kJ and ∆Hrxn=76.3 kJ, reaction is non spontaneous and can’t happen at room temp. —calculate ∆S A. ∆S of S(s)=321 J/K/mol, ∆S Cu(s)=33.2 J/K/mol, ∆S Cu2S(s)=120.9 J/ K/mol B. ∆Srxn=(#moles x ∆S) products - (#moles x ∆S) reactants C. ∆Srxn=-22.4 J/K D. if ∆H is positive and ∆S is negative, ∆G will always be positive under any temp. • couple this reaction with another driving reaction to make it run: S(s) + O2(g)— >SO2(g), ∆G=-300.1 kJ —Cu2S(s) + O2(g)—>2Cu(s) + SO2(g) —∆Grxn=86.2 kJ + (-300.1 kJ) —∆Grxn=-213.9 kJ, reaction is now spontaneous —no “change,” meaning extra ener