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You have a badly tarnished silver teapot. The tarnish is a result of the silver metal reacting with the oxygen in the air according to

4Ag(s)+O2(g)?2Ag2O(s),?H=?62.2kJ/mol

Carefully clean the teapot and then, out of curiosity, you weigh it. The teapot has a mass of 913g . After some more measuring and calculating, you also determine that 5.40% of the silver is on the surface and exposed to the air. If the teapot were once again to become completely tarnished, how much mass ?m is converted to energy?

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