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Jace Toy DDS

Feb 20, 2025

How many kilograms of hot-water (70C) must be mixed with cold-water?

How many kilograms of hot-water (70C) must be mixed with cold-water (20C) so that thetemperature of the water mixer is 30C? The total mass of water (hot + cold) is 200kg.(Assume no heat flows to the surroundings)
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Oran Armstrong

Feb 20, 2025

energy needed to cool the hot water equals that to heat the cold water. U = c·m·∆T U is energy in Joules to heat the material by ∆T c is specific heat of the material in J/kg·K m is mass in kg, ∆T is temperature change in ºClet SH be specific heat of water let M be the mass of not waterSH x M x (70–30) = SH x (200–M) x (30–20)40M = 10(200–M)40M = 2000 – 10M50M = 2000M = 40 kg... Show More
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