Answers edited by Rita

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• A 25-g piece of an unknown metal is heated to 100°c and then placed into a calorimeter containing 45g of water at a temperature of 23.0°c.The final temperature of both is 27.0°c. What is the specific heat of the unknown metal? Show the steps
  
• At a constant temperature, a gas that exerted a pressure of 2.43 atm and that occupied 1.87 L is compressed until its pressure is 6.35 atm. What is the final volume?
  
• A balloon is filled with 4.57 liters of air at room temperature(23.3 deg C). Liquid nitrogen is poured over the balloon until the gas is at a temperature of -197 degrees C. What volume with the gas have inside the balloon?