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20.6 g of steam at 100.00 C was added to some water that was initially at...

20.6 g of steam at 100.00 C was added to some water that was initially at 19.80 C in a styrofoam cup. If the final temperature of the mixture was 75.30 C, what was the mass of water that was originally in the cup? What assumption(s) have you made in your calculation?

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