일반물리학 1 — Temperature, Heat, and the First Law of Thermodynamics: Problem 53

53 A person makes a quantity of iced tea by mixing 250 g of hot tea (essentially water) with an equal mass of ice at its melting point. Assume the mixture has negligible energy exchanges with its environment. If the tea’s initial temperature is $T_i = 90^\circ\text{C}$, when thermal equilibrium is reached what are (a) the mixture’s temperature $T_f$ and (b) the remaining mass $m_f$ of ice? If $T_i = 70^\circ\text{C}$, when thermal equilibrium is reached what are (c) $T_f$ and (d) $m_f$?