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You mix 500 g of hot coffee at 90C with some amount of cold cream at 30C. When the coffee and the cream reach an

You mix 500 g of hot coffee at 90C with some amount of cold cream at 30C. When the coffee and the cream reach an equilibrium the temperature of the mixture is 90C. The specific heat of both the coffee and cream is 4184 J/(kg C). If no heat is lost to the surroundings or gained from the surroundings (including a cup), how much cream did you add?

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