Question

In: Chemistry

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

1. 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)

1.1 M

0.46 M

2.2 M

1.5 M

0.68 M

2. A spoon was silver-plated electrolytically in a AgNO3 solution. If 0.750 g of Ag was deposited on the spoon at a constant current of 20.0 mA, how long (in hours) did the electrolysis take? (1 mA = 1x10–3 A)

5.92 hr

9.32 hr

10.1 hr

11.9 hr

8.76 hr

3.

A voltaic cell is constructed by connecting a nickel electrode that is dipped into 1.20 M NiSO4 solution to a chromium electrode that is dipped into a solution containing Cr3+ at an unknown concentration. The potential of the cell is measured to be 0.552 V. What is the concentration of the Cr3+ in the solution?

1.3 x 10‒5 M

5.8 x 10‒5 M

9.5 x 10‒4 M

5.3 x 10‒3 M

2.9 x 10‒4 M

Expert Solution

queen_honey_blossom answered 2 years ago

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