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 = 200 gT1​ = 20 °C → T2​ = 65 °Cq = ?

How much heat q is needed to warm 200 g of water from 20 °C to 65 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 200 gT1 = 20 °CT2 = 65 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 150 gq = 68 kJΔT = ?

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

q = 68 kJm = 150 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 250 gT = 130 °Cc = 0.129 J/(g·°C)Waterm = 100 gT = 22 °Cc = 4.18 J/(g·°C)

A 250 g block of lead (c = 0.129 J/(g·°C)) at 130 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.129 J/(g·°C)Tmetal = 130 °Cmwater = 100 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 75 gT = 190 °Cc = 0.449 J/(g·°C)Waterm = 100 gT = 21 °Cc = 4.18 J/(g·°C)

A 75 g block of iron (c = 0.449 J/(g·°C)) at 190 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.449 J/(g·°C)Tmetal = 190 °Cmwater = 100 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
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. q = 37.62 kJ
  2. 2. ΔT = 108.5 °C
  3. 3. Tf = 29.74 °C
  4. 4. Tf = 33.6 °C
  5. 5. ΔH° = −1453 kJ
  6. 6. ΔH° = −2220 kJ

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