Calorimetry Knowledge-Based Download PDF

Questions

1. 1.

   Which pair correctly identifies the thermodynamic quantities directly measured by the heat flow in a constant-volume bomb calorimeter and a constant-pressure coffee-cup calorimeter, respectively?

   • A) Change in enthalpy ($\Delta H$) and change in internal energy ($\Delta U$)
   • B) Change in enthalpy ($\Delta H$) and change in Gibbs free energy ($\Delta G$)
   • C) Change in internal energy ($\Delta U$) and change in enthalpy ($\Delta H$)
   • D) Change in entropy ($\Delta S$) and change in internal energy ($\Delta U$)
2. 2.

   A 25.0 g piece of an unknown metal heated to 95.0 °C is placed into an insulated calorimeter containing 75.0 g of water at 20.0 °C. If the final thermal equilibrium temperature of the mixture is 22.0 °C and the specific heat capacity of water is 4.18 J/(g·°C), what is the specific heat capacity of the metal?

   • A) 0.084 J/(g·°C)
   • B) 0.171 J/(g·°C)
   • C) 0.251 J/(g·°C)
   • D) 0.344 J/(g·°C)
3. 3.

   When 50.0 mL of 1.00 M HCl and 50.0 mL of 1.00 M NaOH at 22.0 °C are mixed in a constant-pressure calorimeter, the temperature of the mixture rises to 28.7 °C. Assuming the resulting solution has a mass of 100.0 g and a specific heat capacity of 4.18 J/(g·°C), what is the enthalpy of neutralization per mole of water formed?

   • A) +56.0 kJ/mol
   • B) -28.0 kJ/mol
   • C) -2.80 kJ/mol
   • D) -56.0 kJ/mol
4. 4.

   A 0.500 g sample of a solid fuel is completely combusted in a bomb calorimeter having a heat capacity of 4.80 kJ/°C. If the temperature of the calorimeter system increases from 21.00 °C to 24.50 °C, what is the heat released per gram of the fuel?

   • A) 8.40 kJ/g
   • B) 16.8 kJ/g
   • C) 24.0 kJ/g
   • D) 33.6 kJ/g
5. 5.

   In a constant-pressure calorimeter, a 50.0 g sample of water at 22.0 °C absorbs 3138 J of heat from a dissolution process. Given that the specific heat capacity of water is 4.184 J/(g·°C), what is the final temperature of the water?

   • A) 7.0 °C
   • B) 15.0 °C
   • C) 29.5 °C
   • D) 37.0 °C