Calorimetry & enthalpy worksheet with answers

Free printable Calorimetry & enthalpy worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

New worksheetPractise online with hints

For teachers: free to print, copy and use in class. Every new worksheet has new values and its own answer key. A link to ExamProblems on your course page is appreciated.

Name: ____________________   Date: ____________

1.Easy
waterm = 250 gT1​ = 24 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 250 g of water from 24 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 24 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 100 gq = 60 kJΔT = ?

60 kJ of heat is added to 100 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 60 kJm = 100 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Copperm = 75 gT = 100 °Cc = 0.385 J/(g·°C)Waterm = 300 gT = 17 °Cc = 4.18 J/(g·°C)

A 75 g block of copper (c = 0.385 J/(g·°C)) at 100 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.385 J/(g·°C)Tmetal = 100 °Cmwater = 300 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 75 gT = 160 °Cc = 0.897 J/(g·°C)Waterm = 250 gT = 18 °Cc = 4.18 J/(g·°C)

A 75 g block of aluminium (c = 0.897 J/(g·°C)) at 160 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 18 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.897 J/(g·°C)Tmetal = 160 °Cmwater = 250 gTwater = 18 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l).

ΔH°f(C2H5OH) = −277.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
HC3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C3H8 + 5O₂ → 3CO₂ + 4H₂O(l).

ΔH°f(C3H8) = −103.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ

Answer key

  1. 1. q = 21.95 kJ
  2. 2. ΔT = 143.5 °C
  3. 3. Tf = 18.87 °C
  4. 4. Tf = 26.59 °C
  5. 5. ΔH° = −1367 kJ
  6. 6. ΔH° = −2220 kJ

Full step-by-step solutions: practise this topic on examproblems.com.