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Q. What mass (in grams) of steam at 100°C must be mixed with 287 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 65.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and the latent heat of vaporization is 2256 kJ/kg.

Q. A strong lighting bolt transfers an electric charge of about 15 C to earth (vice versa). How many electrons are transferred?

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