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m = 400 g = 0,4
Q = m c Δt
= 0,4 x 126 x 80
= 4032 J
m = massa (0,4 kg)
c = kalor jenis
Δt = perubahan suhu (100-20 = 80 derajat celcius)
tapi, dari soal itu kalor jenis nya brp??? klo kalor jenisnya ada tinggal di masukin aja ke rumus trs ketemu deh jawabannya...