10 g of water at 80℃ is mixed with 50g of copper at 10℃ . Find the final temperature.
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Answer: ΔQ = mcΔT for water :
ΔQ₁= 80×4.2×(10-T)
∵ T - equilibrium temperature for copper :
ΔQ₂ = 50×0.4×(T-10)
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