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 = 100 gq = 26 kJΔT = ?

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

q = 26 kJm = 100 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 300 gT1​ = 13 °C → T2​ = 90 °Cq = ?

How much heat q is needed to warm 300 g of water from 13 °C to 90 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 13 °CT2 = 90 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 200 gT = 90 °Cc = 0.388 J/(g·°C)Waterm = 300 gT = 25 °Cc = 4.18 J/(g·°C)

A 200 g block of zinc (c = 0.388 J/(g·°C)) at 90 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 25 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.388 J/(g·°C)Tmetal = 90 °Cmwater = 300 gTwater = 25 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 100 gT = 150 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 24 °Cc = 4.18 J/(g·°C)

A 100 g block of lead (c = 0.129 J/(g·°C)) at 150 °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 = 100 gcmetal = 0.129 J/(g·°C)Tmetal = 150 °Cmwater = 400 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H100 g C4​H10​2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 100 g of C4H10 (M = 58.12 g/mol) burns completely: 2C4H10 + 13O₂ → 8CO₂ + 10H₂O(l). Give q as a positive number.

ΔH°f(C4H10) = −125.6 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = kJ
6.Hard
HCH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction CH4 + 2O₂ → CO₂ + 2H₂O(l).

ΔH°f(CH4) = −74.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ

Answer key

  1. 1. ΔT = 62.2 °C
  2. 2. q = 96.56 kJ
  3. 3. Tf = 28.79 °C
  4. 4. Tf = 24.96 °C
  5. 5. q = 4951 kJ
  6. 6. ΔH° = −890.3 kJ

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