Question

1. A system releases 735 kJ of heat and does 85 kJ of work on the surroundings. What is the change in internal energy of the system? 2. An unknown mass of Pyrex glass experiences a temperature change from 23.0 °C to 55.4 °C and absorbs 1,985 J of heat. The specific heat of this material is 0.75 J/(g°C). Calculate the mass of the sample. 3. A 15.2 g sample of Al metal, initially at 95.2 °C, is plunged into 25.3 g of water at 25.2 °C. What is the final temperature of the metal and water once they reach thermal equilibrium? Note that the specific heat capacity of water is 4.184 J/(g°C) and the specific heat capacity of aluminum is 0.903 J/(g°C)

          1. A system releases 735 kJ of heat and does 85 kJ of work on the surroundings. What is the change in internal
energy of the system?
2. An unknown mass of Pyrex glass experiences a temperature change from 23.0 °C to 55.4 °C and
absorbs 1,985 J of heat. The specific heat of this material is 0.75 J/(g°C). Calculate the mass of the
sample.
3. A 15.2 g sample of Al metal, initially at 95.2 °C, is plunged into 25.3 g of water at 25.2 °C. What is the final
temperature of the metal and water once they reach thermal equilibrium? Note that the specific heat
capacity of water is 4.184 J/(g°C) and the specific heat capacity of aluminum is 0.903 J/(g°C)

1. A system releases 735 kJ of heat and does 85 kJ of work on the surroundings. What is the change in internal
energy of the system?
2. An unknown mass of Pyrex glass experiences a temperature change from 23.0 °C to 55.4 °C and
absorbs 1,985 J of heat. The specific heat of this material is 0.75 J/(g°C). Calculate the mass of the
sample.
3. A 15.2 g sample of Al metal, initially at 95.2 °C, is plunged into 25.3 g of water at 25.2 °C. What is the final
temperature of the metal and water once they reach thermal equilibrium? Note that the specific heat
capacity of water is 4.184 J/(g°C) and the specific heat capacity of aluminum is 0.903 J/(g°C)

Added by Encarnacion R.

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