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 = 400 gq = 6 kJΔT = ?

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

q = 6 kJm = 400 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 250 gq = 70 kJΔT = ?

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

q = 70 kJm = 250 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 250 gT = 180 °Cc = 0.449 J/(g·°C)Waterm = 150 gT = 22 °Cc = 4.18 J/(g·°C)

A 250 g block of iron (c = 0.449 J/(g·°C)) at 180 °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 = 0.449 J/(g·°C)Tmetal = 180 °Cmwater = 150 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 250 gT = 130 °Cc = 0.129 J/(g·°C)Waterm = 100 gT = 16 °Cc = 4.18 J/(g·°C)

A 250 g block of lead (c = 0.129 J/(g·°C)) at 130 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.129 J/(g·°C)Tmetal = 130 °Cmwater = 100 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H2CH3​OH + 3O₂reactants2CO₂ + 4H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2CH3OH + 3O₂ → 2CO₂ + 4H₂O(l).

ΔH°f(CH3OH) = −238.7 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 = 3.589 °C
  2. 2. ΔT = 66.99 °C
  3. 3. Tf = 45.99 °C
  4. 4. Tf = 24.17 °C
  5. 5. ΔH° = −1453 kJ
  6. 6. ΔH° = −5755 kJ

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