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 = 1000 gq = 31 kJΔT = ?

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

q = 31 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 400 gq = 63 kJΔT = ?

63 kJ of heat is added to 400 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 63 kJm = 400 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 100 gT = 190 °Cc = 0.129 J/(g·°C)Waterm = 200 gT = 24 °Cc = 4.18 J/(g·°C)

A 100 g block of lead (c = 0.129 J/(g·°C)) at 190 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.129 J/(g·°C)Tmetal = 190 °Cmwater = 200 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 75 gT = 80 °Cc = 0.388 J/(g·°C)Waterm = 150 gT = 17 °Cc = 4.18 J/(g·°C)

A 75 g block of zinc (c = 0.388 J/(g·°C)) at 80 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.388 J/(g·°C)Tmetal = 80 °Cmwater = 150 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
6.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

Answer key

  1. 1. ΔT = 7.416 °C
  2. 2. ΔT = 37.68 °C
  3. 3. Tf = 26.52 °C
  4. 4. Tf = 19.79 °C
  5. 5. ΔH° = −2220 kJ
  6. 6. ΔH° = −3119 kJ

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