Determine the emf for the cell noted below. (For Co3+(aq) + e- → Co2+(aq), E0 = 1.80 V, and for Na+(aq) + e- → Na(s), E0 = -2.71 V.)

Na(s) | Na+(aq) || Co3+(aq), Co2+(aq) | Co(s)
What is being oxidized? What is being reduced? What has the more positive reduction potential? Is this a voltaic cell? What is that absolute difference between the reduction potentials? What is the emf?

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