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Three portions of the same liquid are mixed in a container that prevents the exchange of...

Three portions of the same liquid are mixed in a container that prevents the exchange of heat with the environment. Portion A has a mass m and a temperature of 98.0 °C, portion B also has a mass m but a temperature of 84.0 °C, and portion C has a mass mC and a temperature of 41.0 °C. What must be the mass of portion C so that the final temperature Tf of the three-portion mixture is Tf = 59.0 °C? Express your answer in terms of m; for example, mc = 2.20 m.

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