These are Thermodynamics questions: There  is a  7 kg piece of aluminum at 80°C placed in a 3 kg water at…

These are Thermodynamics questions:

There  is a  7 kg piece of aluminum at 80°C placed in a 3 kg water at 20°C what is the final temperature?  

 

There is a piece of aluminum at 90°C placed  in 2 kg of water at 35°C how much energy is transferred if the final temperature is 45? What is the weight of the aluminum? 

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