A 100 g glass container contains 250 g of water at 15.0 °C. A 100 g piece of unknown material at 100 °C is added to the water in the container. The final temperature of the mixture is 19.0 °C. What is the specific heat of the unknown material in J/kg °C? (specific heat of water = 4,186 J/kg °C, specific heat of glass = 837.2 J/kg °C)

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245

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387

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412

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558

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674