chem HW 4 electrochem

chem HW 4 electrochem - 1.3.42/3.84 pointsAll Submissions...

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1. 3.42/3.84 points All Submissions Notes Question: ZumChemP6 11.E.018. Calculate  ° values for the following cells. Which reactions are  spontaneous as written (under standard conditions)? Balance the  reactions. Standard reduction potentials are found in the  table . (Use the  lowest possible coefficients. Include states-of-matter under the given  conditions in your answer.) (a) MnO 4 ( aq ) + I  ( aq  I 2 ( aq ) + Mn 2+ ( aq ) ° .97   0.97  V    spontaneous not spontaneous     reaction 10I - ( aq ) + 2MnO 4 - ( aq ) + 16H + ( aq )     2Mn 2+ ( aq ) + 8H 2 O( l ) + 5I 2 ( aq ) 16 H + ( aq ) + 2 MnO  - 4 ( aq ) + 10 I - ( aq )     5 I 2 ( aq ) + 2 Mn 2+ ( aq ) + 8 H 2 O( l )   Correct. (b) H 2 ( g  H + ( aq ) + H  ( aq ) ° -2.23   -2.23 V  spontaneous   not spontaneous     reaction H 2 ( g )     H + ( aq ) + H - ( aq ) H 2 ( g )     H + ( aq ) + H - ( aq )   Correct. (c) Au 3+ ( aq ) + Ag( s  Ag + ( aq ) + Au( s ) ° .70   0.7 n V    spontaneous not spontaneous     reaction Au 3+ ( aq ) + 3Ag( s )     Au( s ) + 3Ag + ( aq ) Au 3+ ( aq ) + 3 Ag( s )     Au( s ) + 3 Ag + ( aq )   Correct. 2. 3.84/3.84 points All Submissions Notes Question: ZumChemP6 11.E.020. Consider the following galvanic cells.
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For each galvanic cell, give the balanced cell reaction and determine  °.  Standard reduction potentials are found in the  table . (Use the lowest  possible coefficients. Include states-of-matter under SATP conditions in  your answer.) (a) reaction  Au 3+ ( aq ) + 3Cu 1+ ( aq )     Au( s ) + 3Cu 2+ ( aq ) Au 3+ ( aq ) + 3 Cu + ( aq )     Au( s ) + 3 Cu 2+ ( aq )   Correct. ° 1.34   1.34  V  (b) reaction  2VO 2 + ( aq ) + 4H + ( aq ) + Cd( s )     Cd 2+ ( aq ) + 2VO 2+ ( aq ) + 2H 2 O( l ) 2 VO  + 2 ( aq ) + 4 H + ( aq ) + Cd( s )     2 VO 2+ ( aq ) + 2 H 2 O( l ) + Cd 2+ ( aq )   Correct. ° 1.40   1.4  V 3. 3.46/3.84 points All Submissions Notes Question: ZumChemP6 11.E.022. The saturated calomel electrode, abbreviated SCE, is often used as a 
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chem HW 4 electrochem - 1.3.42/3.84 pointsAll Submissions...

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