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 = 750 gq = 24 kJΔT = ?

24 kJ of heat is added to 750 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 24 kJm = 750 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 500 gT1​ = 16 °C → T2​ = 65 °Cq = ?

How much heat q is needed to warm 500 g of water from 16 °C to 65 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 500 gT1 = 16 °CT2 = 65 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 75 gT = 90 °Cc = 0.388 J/(g·°C)Waterm = 300 gT = 19 °Cc = 4.18 J/(g·°C)

A 75 g block of zinc (c = 0.388 J/(g·°C)) at 90 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.388 J/(g·°C)Tmetal = 90 °Cmwater = 300 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 250 gT = 120 °Cc = 0.449 J/(g·°C)Waterm = 300 gT = 16 °Cc = 4.18 J/(g·°C)

A 250 g block of iron (c = 0.449 J/(g·°C)) at 120 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.449 J/(g·°C)Tmetal = 120 °Cmwater = 300 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 = 7.656 °C
  2. 2. q = 102.4 kJ
  3. 3. Tf = 20.61 °C
  4. 4. Tf = 24.54 °C
  5. 5. ΔH° = −1453 kJ
  6. 6. ΔH° = −5755 kJ

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