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A plastic cup of negligible mass contains 0.280 kg of an unknown
liquid at a temperature of 30.0°C. A 0.0270 kg mass of ice at a
temperature of 0.0°C is added to the liquid, and when thermal equilibrium
is reached the temperature of the combined substances is 14.0°C.
Assuming no heat is exchanged with the surroundings, what is the specific
heat capacity of the unknown liquid?

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