Calculate the equilibrium constant for each of the reactions at25 ?C.

Standard Electrode Potentials at 25 ?C

Reduction Half-Reaction		E?(V)
Pb2+(aq)+2e?	?Pb(s)	-0.13
Mg2+(aq)+2e?	?Mg(s)	-2.37
Br2(l)+2e?	?2Br?(aq)	1.09
Cl2(g)+2e?	?2Cl?(aq)	1.36
MnO2(s)+4H+(aq)+2e?	?Mn2+(aq)+2H2O(l)	1.21
Cu2+(aq)+2e?	?Cu(s)	0.16

Part A:

Pb2+(aq)+Mg(s)?Pb(s)+Mg2+(aq)

Express your answer using three significant figures.

Part B:

Br2(l)+2Cl?(aq)?2Br?(aq)+Cl2(g)

Express your answer using two significant figures.

Part C:

MnO2(s)+4H+(aq)+Cu(s)?Mn2+(aq)+2H2O(l)+Cu2+(aq)

Express your answer using two significant figures.