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.

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1.Easy
waterm = 500 gq = 79 kJΔT = ?

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

q = 79 kJm = 500 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 300 gq = 36 kJΔT = ?

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

q = 36 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 250 gT = 90 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 22 °Cc = 4.18 J/(g·°C)

A 250 g block of lead (c = 0.129 J/(g·°C)) at 90 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.129 J/(g·°C)Tmetal = 90 °Cmwater = 400 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 50 gT = 90 °Cc = 0.897 J/(g·°C)Waterm = 400 gT = 24 °Cc = 4.18 J/(g·°C)

A 50 g block of aluminium (c = 0.897 J/(g·°C)) at 90 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.897 J/(g·°C)Tmetal = 90 °Cmwater = 400 gTwater = 24 °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
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

Answer key

  1. 1. ΔT = 37.8 °C
  2. 2. ΔT = 28.71 °C
  3. 3. Tf = 23.29 °C
  4. 4. Tf = 25.72 °C
  5. 5. ΔH° = −3119 kJ
  6. 6. ΔH° = −1367 kJ

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