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 = 1000 gq = 36 kJΔT = ?

36 kJ of heat is added to 1000 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 36 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 250 gq = 73 kJΔT = ?

73 kJ of heat is added to 250 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 73 kJm = 250 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Copperm = 100 gT = 190 °Cc = 0.385 J/(g·°C)Waterm = 150 gT = 20 °Cc = 4.18 J/(g·°C)

A 100 g block of copper (c = 0.385 J/(g·°C)) at 190 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 20 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.385 J/(g·°C)Tmetal = 190 °Cmwater = 150 gTwater = 20 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 75 gT = 140 °Cc = 0.385 J/(g·°C)Waterm = 250 gT = 25 °Cc = 4.18 J/(g·°C)

A 75 g block of copper (c = 0.385 J/(g·°C)) at 140 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 25 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.385 J/(g·°C)Tmetal = 140 °Cmwater = 250 gTwater = 25 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2C2H6 + 7O₂ → 4CO₂ + 6H₂O(l).

ΔH°f(C2H6) = −84.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H250 g C2​H5​OHC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 g of C2H5OH (M = 46.07 g/mol) burns completely: C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l). Give q as a positive number.

ΔH°f(C2H5OH) = −277.7 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 = 8.612 °C
  2. 2. ΔT = 69.86 °C
  3. 3. Tf = 29.83 °C
  4. 4. Tf = 28.09 °C
  5. 5. ΔH° = −3119 kJ
  6. 6. q = 7416 kJ

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