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 gq = 49 kJΔT = ?

49 kJ of heat is added to 250 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 49 kJm = 250 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 150 gT1​ = 23 °C → T2​ = 75 °Cq = ?

How much heat q is needed to warm 150 g of water from 23 °C to 75 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 150 gT1 = 23 °CT2 = 75 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Ironm = 50 gT = 90 °Cc = 0.449 J/(g·°C)Waterm = 100 gT = 23 °Cc = 4.18 J/(g·°C)

A 50 g block of iron (c = 0.449 J/(g·°C)) at 90 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 23 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.449 J/(g·°C)Tmetal = 90 °Cmwater = 100 gTwater = 23 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 200 gT = 180 °Cc = 0.385 J/(g·°C)Waterm = 300 gT = 19 °Cc = 4.18 J/(g·°C)

A 200 g block of copper (c = 0.385 J/(g·°C)) at 180 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.385 J/(g·°C)Tmetal = 180 °Cmwater = 300 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2C2H6 + 7O₂ → 4CO₂ + 6H₂O(l).

ΔH°f(C2H6) = −84.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H2CH3​OH + 3O₂reactants2CO₂ + 4H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2CH3OH + 3O₂ → 2CO₂ + 4H₂O(l).

ΔH°f(CH3OH) = −238.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ

Answer key

  1. 1. ΔT = 46.89 °C
  2. 2. q = 32.6 kJ
  3. 3. Tf = 26.42 °C
  4. 4. Tf = 28.31 °C
  5. 5. ΔH° = −3119 kJ
  6. 6. ΔH° = −1453 kJ

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