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 = 77 kJΔT = ?

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

q = 77 kJm = 400 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 750 gq = 49 kJΔT = ?

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

q = 49 kJm = 750 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 150 gT = 170 °Cc = 0.129 J/(g·°C)Waterm = 300 gT = 15 °Cc = 4.18 J/(g·°C)

A 150 g block of lead (c = 0.129 J/(g·°C)) at 170 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 15 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.129 J/(g·°C)Tmetal = 170 °Cmwater = 300 gTwater = 15 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 100 gT = 180 °Cc = 0.129 J/(g·°C)Waterm = 100 gT = 24 °Cc = 4.18 J/(g·°C)

A 100 g block of lead (c = 0.129 J/(g·°C)) at 180 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.129 J/(g·°C)Tmetal = 180 °Cmwater = 100 gTwater = 24 °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
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 = 46.05 °C
  2. 2. ΔT = 15.63 °C
  3. 3. Tf = 17.36 °C
  4. 4. Tf = 28.67 °C
  5. 5. ΔH° = −2802 kJ
  6. 6. ΔH° = −5755 kJ

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