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What minimum concentration of Sn2+ would be necessary to make the following reaction spontaneous at 25°C...

What minimum concentration of Sn2+ would be necessary to make the following reaction spontaneous at 25°C if [Pb2+] = 1.0 M?             

Pb(s) + Sn2+(aq) → Pb2+(aq) + Sn(s)

1.5 M

2.2 M   

0.68 M   

1.1 M

0.46 M

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