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A mixture of 49.9 g of sand and 73.3 g of water has a temperature of 11.9 C. What mass of water at 78.2 C

A mixture of 49.9 g of sand and 73.3 g of water has a temperature of 11.9 C. What mass of water at 78.2 C must be added to raise the final temperature of the mixture to 27.3 C?

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