Trộn hỗn hợp rượu vào nước người ta thu được 1 hơn hợp 140g ở nhiệt độ t= 40°C. Biết nhiệt độ ban đầu của rượu là t1= 16°C và nước là t2= 100°C; nhiệt dung riêng của rượu là C1= 2500J/kg.K,nhiệt dung riêng của nc là C2= 4200J/kg.K a) Nếu côg thực tính nhiệt lượng vật tòa ra b) Tình khỏi lượng của rượu và nước ban đầu đã cho

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