A combination of .403 kg of water at 45.1 C, .471 kg of aluminum at 41.1 C, and .307 kg of copper at 50.4 C is mixed in an insulated container and allowed to come to thermal equilibrium. Determine the final temperature of the mixture. Neglect any energy transfer to or from the container and assume the specific heat of copper is 387 J/kg C and the specific heat of water is 4186 J/kg C. Answer in units of C.
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