How much wood do you need to burn to heat 5 kg of water from 20C to 100C?
| September 19, 2021 | education
mw = 5 kg.
C = 4200 J / kg * ° C.
t1 = 20 ° C.
t2 = 100 ° C.
q = 10 ^ 7 J / kg.
md -?
Qw = Qd.
Qw = C * mw * (t2 – t1).
Qd = q * md.
C * mw * (t2 – t1) = q * md.
md = C * mw * (t2 – t1) / q.
md = 4200 J / kg * ° C * 5 kg * (100 ° C – 20 ° C) / 10 ^ 7 J / kg = 0.168 kg.
Answer: it is necessary to burn firewood md = 0.168 kg.
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