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 = 250 gq = 20 kJΔT = ?

20 kJ of heat is added to 250 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 20 kJm = 250 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 300 gT1​ = 11 °C → T2​ = 85 °Cq = ?

How much heat q is needed to warm 300 g of water from 11 °C to 85 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 11 °CT2 = 85 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Leadm = 50 gT = 150 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 22 °Cc = 4.18 J/(g·°C)

A 50 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 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.129 J/(g·°C)Tmetal = 150 °Cmwater = 400 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 100 gT = 130 °Cc = 0.388 J/(g·°C)Waterm = 200 gT = 17 °Cc = 4.18 J/(g·°C)

A 100 g block of zinc (c = 0.388 J/(g·°C)) at 130 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.388 J/(g·°C)Tmetal = 130 °Cmwater = 200 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H50 g C6​H12​O6​C6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 50 g of C6H12O6 (M = 180.16 g/mol) burns completely: C6H12O6 + 6O₂ → 6CO₂ + 6H₂O(l). Give q as a positive number.

ΔH°f(C6H12O6) = −1274 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 = 19.14 °C
  2. 2. q = 92.8 kJ
  3. 3. Tf = 22.49 °C
  4. 4. Tf = 22.01 °C
  5. 5. q = 777.6 kJ
  6. 6. ΔH° = −890.3 kJ

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