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Resolução da questão de Termodinâmica da ACAFE 2007
Necessita-se aquecer uma massa m de água de 5ºC a 95ºC utilizando como combustível o etanol. Admitindo-se que, efetivamente, 60% da energia proveniente da queima de uma massa mE de etanol seja transferida para o aquecimento da água. O valor mais próximo da razão m/mE será:
(Dados: calor específico da água: 1 cal/gºC; calor de combustão do etanol: 6000 kcal/kg)
a) 70
b) 80
c) 50
d) 40
e) 60
Gabarito: D
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