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The electric potential difference across the cell membrane of a human cell is 0.080 V, with the higher potential being outside the cell. In one cellular process a sodium ion Na+, with charge +e, is pumped through a channel in the membrane to be ejected from the cell.

(a) How much work must be done by the cell to eject the ion?

(b) A candy bar contains 270 Calories, or 1.13*10^6 J of food energy. How many sodium ions could the cells of your body eject using the energy obtained in one candy bar?

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