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Exercício de A quantidade de calor liberada por 1000g de água, ao reduzir sua temperatura de 8,0ºC, em cal, é:
Sua Pergunta:
Durante o eclipse, em uma das cidades na zona de totalidade, Criciúma-SC, ocorreu uma queda de temperatura de 8,0ºC. (Zero Horas – 04/11/1994) Sabendo que o calor específico sensível da água é 1,0 cal/gºC, a quantidade de calor liberada por 1000g de água, ao reduzir sua temperatura de 8,0ºC, em cal, é:
a) 8,0
b) 125
c) 4000
d) 8000
e) 64000
Resposta: D
03. (UFPR) Durante o eclipse, em uma das cidades na zona de totalidade, Criciúma-SC, ocorreu uma queda de temperatura de 8,0ºC. (Zero Horas – 04/11/1994) Sabendo que o calor específico sensível da água é 1,0 cal/gºC, a quantidade de calor liberada por 1000g de água, ao reduzir sua temperatura de 8,0ºC, em cal, é:
dadosΔT = -8ºCc = 1 cal/gºCm = 1000 gComo não houve transição de fase,Q = m . c . ΔTQ = 1000 . 1 . 8portanto=============Q = 8000 cal==============ou seja, 1000 g de água deve perder 8000 cal.
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