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 = 250 gT1​ = 29 °C → T2​ = 85 °Cq = ?

How much heat q is needed to warm 250 g of water from 29 °C to 85 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 29 °CT2 = 85 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 750 gq = 78 kJΔT = ?

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

q = 78 kJm = 750 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Aluminiumm = 75 gT = 130 °Cc = 0.897 J/(g·°C)Waterm = 200 gT = 16 °Cc = 4.18 J/(g·°C)

A 75 g block of aluminium (c = 0.897 J/(g·°C)) at 130 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.897 J/(g·°C)Tmetal = 130 °Cmwater = 200 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 200 gT = 190 °Cc = 0.129 J/(g·°C)Waterm = 250 gT = 19 °Cc = 4.18 J/(g·°C)

A 200 g block of lead (c = 0.129 J/(g·°C)) at 190 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.129 J/(g·°C)Tmetal = 190 °Cmwater = 250 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
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. q = 58.52 kJ
  2. 2. ΔT = 24.88 °C
  3. 3. Tf = 24.49 °C
  4. 4. Tf = 23.12 °C
  5. 5. ΔH° = −5755 kJ
  6. 6. ΔH° = −1367 kJ

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