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 gT1​ = 13 °C → T2​ = 65 °Cq = ?

How much heat q is needed to warm 400 g of water from 13 °C to 65 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 400 gT1 = 13 °CT2 = 65 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 1000 gT1​ = 18 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 1000 g of water from 18 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 1000 gT1 = 18 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 250 gT = 80 °Cc = 0.388 J/(g·°C)Waterm = 150 gT = 16 °Cc = 4.18 J/(g·°C)

A 250 g block of zinc (c = 0.388 J/(g·°C)) at 80 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.388 J/(g·°C)Tmetal = 80 °Cmwater = 150 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 250 gT = 110 °Cc = 0.385 J/(g·°C)Waterm = 150 gT = 17 °Cc = 4.18 J/(g·°C)

A 250 g block of copper (c = 0.385 J/(g·°C)) at 110 °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 = 250 gcmetal = 0.385 J/(g·°C)Tmetal = 110 °Cmwater = 150 gTwater = 17 °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
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. q = 86.94 kJ
  2. 2. q = 154.7 kJ
  3. 3. Tf = 24.57 °C
  4. 4. Tf = 29.38 °C
  5. 5. ΔH° = −2802 kJ
  6. 6. ΔH° = −1453 kJ

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