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^T = q / m.c
8400 / 100 . 4,2
8400 / 4200
= 2' celsius
=1×100=100
Q=M.c.ΔT
=100.4,2.(T-1))
=420(T-1)
=420T-420
8400=420T-420
420T=8400+420
420T=8820
T=21 C