干木柴的热值是1.2×10^7J/kg,
完全燃烧5kg的干木材,放出的热量为6*10^7J
由Q吸=cm(t-t0),得
t=t0+Q吸/cm=20℃+6*10^7*50%/(4200*50)
=20+142.9=162.9≥100℃
所以,水的末温为100℃
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