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​ = 25 °C → T2​ = 70 °Cq = ?

How much heat q is needed to warm 250 g of water from 25 °C to 70 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 25 °CT2 = 70 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 300 gq = 31 kJΔT = ?

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

q = 31 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 150 gT = 110 °Cc = 0.129 J/(g·°C)Waterm = 250 gT = 22 °Cc = 4.18 J/(g·°C)

A 150 g block of lead (c = 0.129 J/(g·°C)) at 110 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.129 J/(g·°C)Tmetal = 110 °Cmwater = 250 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 200 gT = 160 °Cc = 0.388 J/(g·°C)Waterm = 150 gT = 19 °Cc = 4.18 J/(g·°C)

A 200 g block of zinc (c = 0.388 J/(g·°C)) at 160 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.388 J/(g·°C)Tmetal = 160 °Cmwater = 150 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 = 47.02 kJ
  2. 2. ΔT = 24.72 °C
  3. 3. Tf = 23.6 °C
  4. 4. Tf = 34.53 °C
  5. 5. ΔH° = −5755 kJ
  6. 6. ΔH° = −1367 kJ

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