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 = 750 gT1​ = 16 °C → T2​ = 75 °Cq = ?

How much heat q is needed to warm 750 g of water from 16 °C to 75 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 750 gT1 = 16 °CT2 = 75 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 1000 gq = 7 kJΔT = ?

7 kJ of heat is added to 1000 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 7 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 250 gT = 160 °Cc = 0.449 J/(g·°C)Waterm = 400 gT = 24 °Cc = 4.18 J/(g·°C)

A 250 g block of iron (c = 0.449 J/(g·°C)) at 160 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.449 J/(g·°C)Tmetal = 160 °Cmwater = 400 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 50 gT = 80 °Cc = 0.897 J/(g·°C)Waterm = 100 gT = 23 °Cc = 4.18 J/(g·°C)

A 50 g block of aluminium (c = 0.897 J/(g·°C)) at 80 °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 = 0.897 J/(g·°C)Tmetal = 80 °Cmwater = 100 gTwater = 23 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l).

ΔH°f(C2H5OH) = −277.7 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. q = 185 kJ
  2. 2. ΔT = 1.675 °C
  3. 3. Tf = 32.56 °C
  4. 4. Tf = 28.52 °C
  5. 5. ΔH° = −1367 kJ
  6. 6. ΔH° = −5755 kJ

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