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​ = 25 °C → T2​ = 40 °Cq = ?

How much heat q is needed to warm 750 g of water from 25 °C to 40 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 750 gT1 = 25 °CT2 = 40 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 100 gq = 73 kJΔT = ?

73 kJ of heat is added to 100 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 73 kJm = 100 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Aluminiumm = 75 gT = 110 °Cc = 0.897 J/(g·°C)Waterm = 400 gT = 17 °Cc = 4.18 J/(g·°C)

A 75 g block of aluminium (c = 0.897 J/(g·°C)) at 110 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.897 J/(g·°C)Tmetal = 110 °Cmwater = 400 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 100 gT = 200 °Cc = 0.449 J/(g·°C)Waterm = 100 gT = 25 °Cc = 4.18 J/(g·°C)

A 100 g block of iron (c = 0.449 J/(g·°C)) at 200 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 25 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.449 J/(g·°C)Tmetal = 200 °Cmwater = 100 gTwater = 25 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H10 g C2​H5​OHC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 10 g of C2H5OH (M = 46.07 g/mol) burns completely: C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l). Give q as a positive number.

ΔH°f(C2H5OH) = −277.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = 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 = 47.02 kJ
  2. 2. ΔT = 174.6 °C
  3. 3. Tf = 20.6 °C
  4. 4. Tf = 41.97 °C
  5. 5. q = 296.7 kJ
  6. 6. ΔH° = −5755 kJ

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