Is the system consisting of the aluminum and the water a, Ask an Expert

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A student places a 65 gram aluminum cylinder that was just removed from boiling water into a styrofoam cup holding 105 grams of 21 ?C water. He determines that the equilibrium temperature for the mixture is 29.6?C.
Is the system consisting of the aluminum and the water a closed system? Explain your reasoning. If not, how much energy was lost or gained by the system during the experiment?

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