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cw=4200
Δt₁ = 35-12=23 C
m₂=?
Δt₂=100-35=65 C
ciepło oddane przez wrzątek = ciepło pobrane
m₂×cw×Δt₂ = m₁×cw×Δt₁ cw się skraca
m₂×65=70×23
m₂×65=1610
m₂=1610:65=24,76 kg