Worksheet: Enthalpy Measurements
In this worksheet, we will practice using calorimetry data to determine enthalpy changes during phase changes and chemical reactions.
When solid ammonium nitrate dissolves in water, the solution becomes cold. This is the basis for an “instant ice pack”:
When 3.21 g of solid dissolves in 50.0 g of water at in a calorimeter, the temperature decreases to . Assuming that the water has a specific heat capacity of :
Calculate the value of q for this reaction
- A J
- B J
- C J
- D J
- E J
What is the molar enthalpy for the dissolution of ammonium nitrate in water?
- A52 kJ/mol
- B22 kJ/mol
- C19 kJ/mol
- D26 kJ/mol
- E35 kJ/mol
Calculate, to 2 decimal places, the enthalpy change produced from the thermal decomposition of 126 g of magnesium carbonate, its molar mass is 84.313 g/mol, under constant pressure according to the given equation.
- A kJ
- B kJ
- C kJ
- D kJ