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In an insulated container, a 5.0 g sample of water at 80.°C was added to an...

In an insulated container, a 5.0 g sample of water at 80.°C was added to an unknown mass of cooler water at 30.°C. The final temperature of the resulting mixture became 35°C. What mass of cooler water was present? (Assume the container itself adsorbed a negligible amount of heat.)

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