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Suppose an alkaline 9 V battery can supply 100 mA (to power a small light bulb,...

Suppose an alkaline 9 V battery can supply 100 mA (to power a small light bulb, for example) for about 4 hours before too much of the voltage is depleted to be of use. It is therefore described as having a capacity of 400 mAh (milliamp-hours). How many electrons is this? Use the same charge for the electron as before. Also, where do the electrons come from and where do they go?
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