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 = 300 gq = 77 kJΔT = ?

77 kJ of heat is added to 300 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 77 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 150 gT1​ = 30 °C → T2​ = 90 °Cq = ?

How much heat q is needed to warm 150 g of water from 30 °C to 90 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 150 gT1 = 30 °CT2 = 90 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Aluminiumm = 75 gT = 120 °Cc = 0.897 J/(g·°C)Waterm = 150 gT = 24 °Cc = 4.18 J/(g·°C)

A 75 g block of aluminium (c = 0.897 J/(g·°C)) at 120 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.897 J/(g·°C)Tmetal = 120 °Cmwater = 150 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 250 gT = 120 °Cc = 0.388 J/(g·°C)Waterm = 150 gT = 22 °Cc = 4.18 J/(g·°C)

A 250 g block of zinc (c = 0.388 J/(g·°C)) at 120 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.388 J/(g·°C)Tmetal = 120 °Cmwater = 150 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HCH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction CH4 + 2O₂ → CO₂ + 2H₂O(l).

ΔH°f(CH4) = −74.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2C4H10 + 13O₂ → 8CO₂ + 10H₂O(l).

ΔH°f(C4H10) = −125.6 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ

Answer key

  1. 1. ΔT = 61.4 °C
  2. 2. q = 37.62 kJ
  3. 3. Tf = 33.3 °C
  4. 4. Tf = 35.13 °C
  5. 5. ΔH° = −890.3 kJ
  6. 6. ΔH° = −5755 kJ

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