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A chemist doing an experiment places a sample of beryllium (1820J/kgC) at 20 degrees celsius into a 0.22kg glass beaker also at 20 degrees celsius.

A chemist doing an experiment places a sample of beryllium (1820J/kgC) at 20 degrees celsius into a 0.22kg glass beaker also at 20 degrees celsius. Water of mass 0.3kg and temperature 80 degrees celsius is poured over the beryllium. If the thermal equilibrium temperature of the closed system is 40 degrees celsius, what is the mass of the beryllium?

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