& Given that AH is nogatiss and AS is positihe for a reaction, the reaction will
ID: 636833 • Letter: #
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& Given that AH is nogatiss and AS is positihe for a reaction, the reaction will be 19 Given the following half-reactions, which are amanged in the same onder as in your Chem 132 Tabie (voltages hecome more positive from top to hetiom): Irf you make a misture of P. Pb (s).udu6)all in the same beaker, which way Electrons low spontaneoaly? a. from Cu (s) to P b. from Cu" to Pb (s) c. from Pb to Cu (s) 20. IfAG for a reaction is negative, which of the following stanemes) must be true? 1. ASe is negative 2. The reaction is spontancous as writin 3. Ko is large number (grcater than 1 4. AlH is positive a. 2 only b. 1 and 4 only 2and 3 only d. 1. 2, and 4 ony eall must be true 21. Consider the following electrochemical cell opercing at25'C (Pt is an inent electrode): Which one of the following will be tres when the cell operates spontancously? (That is, when e ane allowed to flow whichever way they want to )Explanation / Answer
18. As we know the formula
G =H-T*S
So, if H is negative and S is always positive
Then G is always negative according to equation so, if G is negative then reaction is spontaneous (temperature can not effect it because whole equation is negative) option a is correct
20.as we know ifG is negative then reaction is always spontaneous so option 2 is correct and Keq is large greater than 1 because if G is negative then reaction is spontaneous and if reaction is spontaneous then shifting rate of forward direction is increases and product formation increases.and we know Keq=product of active masses of product/product of active masses of reactants. So,if forward rate increases active masses increases and Keq increases . So Keq large greater than 1 . Option 3 is correct.
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