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Verified answer
M (massa) = 1 kg = 1000 gramT₁ = 100°C
T₂ = 25°C
c = 4,2 J/gram.°C
Q = ...............................?
Q = m.c.ΔT
= m.c.(T₂ - T₁)
= 1000.4,2.(25 - 100)
= 4200.-75
= -315000 J
= -315 KJ