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 = 100 gq = 28 kJΔT = ?

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

q = 28 kJm = 100 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 500 gq = 74 kJΔT = ?

74 kJ of heat is added to 500 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 74 kJm = 500 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Zincm = 75 gT = 190 °Cc = 0.388 J/(g·°C)Waterm = 150 gT = 18 °Cc = 4.18 J/(g·°C)

A 75 g block of zinc (c = 0.388 J/(g·°C)) at 190 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 18 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.388 J/(g·°C)Tmetal = 190 °Cmwater = 150 gTwater = 18 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 150 gT = 180 °Cc = 0.388 J/(g·°C)Waterm = 100 gT = 22 °Cc = 4.18 J/(g·°C)

A 150 g block of zinc (c = 0.388 J/(g·°C)) at 180 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.388 J/(g·°C)Tmetal = 180 °Cmwater = 100 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
H250 g C3​H8​C3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 g of C3H8 (M = 44.1 g/mol) burns completely: C3H8 + 5O₂ → 3CO₂ + 4H₂O(l). Give q as a positive number.

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

Answer key

  1. 1. ΔT = 66.99 °C
  2. 2. ΔT = 35.41 °C
  3. 3. Tf = 25.63 °C
  4. 4. Tf = 41.31 °C
  5. 5. ΔH° = −890.3 kJ
  6. 6. q = 12584 kJ

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