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 gT1​ = 14 °C → T2​ = 90 °Cq = ?

How much heat q is needed to warm 750 g of water from 14 °C to 90 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 750 gT1 = 14 °CT2 = 90 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 750 gq = 5 kJΔT = ?

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

q = 5 kJm = 750 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 100 gT = 160 °Cc = 0.449 J/(g·°C)Waterm = 200 gT = 20 °Cc = 4.18 J/(g·°C)

A 100 g block of iron (c = 0.449 J/(g·°C)) at 160 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 20 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.449 J/(g·°C)Tmetal = 160 °Cmwater = 200 gTwater = 20 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 150 gT = 180 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 21 °Cc = 4.18 J/(g·°C)

A 150 g block of lead (c = 0.129 J/(g·°C)) at 180 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.129 J/(g·°C)Tmetal = 180 °Cmwater = 400 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HC6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C6H12O6 + 6O₂ → 6CO₂ + 6H₂O(l).

ΔH°f(C6H12O6) = −1274 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 = 238.3 kJ
  2. 2. ΔT = 1.595 °C
  3. 3. Tf = 27.14 °C
  4. 4. Tf = 22.82 °C
  5. 5. ΔH° = −2802 kJ
  6. 6. ΔH° = −1367 kJ

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