I'm in TROUBLE! PLZ help me!! They're DUE 2morrow!!!

The following question is from my chemistry lab and due tomorrow. Please help me. Thank you.
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1. A calorimeter is to be calibrated 51.203 g of water at 55.2 Celcius is added to a calorimeter containing 49.783 g of water at 23.5 Celcius. After stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 Celcius. Caluculate the calorimeter constant. Show your calculation.

Thank you so much.

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