Two 20.0-g ice cubes at –20.0 °c are placed into 205 g of water at 25.0 °c. assuming no energy is transferred to or from the surroundings, calculate the final temperature, tf, of the water after all the ice melts.

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07-09-2017
Chemistry

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Two 20.0-g ice cubes at –20.0 °c are placed into 205 g of water at 25.0 °c. assuming no energy is transferred to or from the surroundings, calculate the final temperature, tf, of the water after all the ice melts.

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Kalahira Kalahira · Answer 1 · 2017-09-19T18:20:33+02:00

Taking in account that ice cubes are made with water, both substance has the same heat propieties, so then only needs to consider mass and temperatures to reach a solution and use a weighted average of the initial temperatures, 2 ice of 20 gr. at -20ºC or 253.15º K and 205 gr of water at 25ºC or 298.15ºK, then final temperature, Tf is: Tf= ((2*20*253.15)+(205*298.15))/(2*20+205)=290.8ºK or 17.65ºC The final temperature after ice melts decrease till 17.65ºC