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 = 150 gq = 50 kJΔT = ?

50 kJ of heat is added to 150 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 50 kJm = 150 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 500 gq = 75 kJΔT = ?

75 kJ of heat is added to 500 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 75 kJm = 500 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 75 gT = 100 °Cc = 0.449 J/(g·°C)Waterm = 250 gT = 17 °Cc = 4.18 J/(g·°C)

A 75 g block of iron (c = 0.449 J/(g·°C)) at 100 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.449 J/(g·°C)Tmetal = 100 °Cmwater = 250 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 150 gT = 90 °Cc = 0.449 J/(g·°C)Waterm = 150 gT = 17 °Cc = 4.18 J/(g·°C)

A 150 g block of iron (c = 0.449 J/(g·°C)) at 90 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.449 J/(g·°C)Tmetal = 90 °Cmwater = 150 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HCH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction CH4 + 2O₂ → CO₂ + 2H₂O(l).

ΔH°f(CH4) = −74.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
HC3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C3H8 + 5O₂ → 3CO₂ + 4H₂O(l).

ΔH°f(C3H8) = −103.8 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 = 79.74 °C
  2. 2. ΔT = 35.89 °C
  3. 3. Tf = 19.59 °C
  4. 4. Tf = 24.08 °C
  5. 5. ΔH° = −890.3 kJ
  6. 6. ΔH° = −2220 kJ

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