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 = 43 kJΔT = ?

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

q = 43 kJm = 100 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 400 gT1​ = 18 °C → T2​ = 70 °Cq = ?

How much heat q is needed to warm 400 g of water from 18 °C to 70 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 400 gT1 = 18 °CT2 = 70 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Leadm = 100 gT = 110 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 22 °Cc = 4.18 J/(g·°C)

A 100 g block of lead (c = 0.129 J/(g·°C)) at 110 °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 = 100 gcmetal = 0.129 J/(g·°C)Tmetal = 110 °Cmwater = 400 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 200 gT = 140 °Cc = 0.897 J/(g·°C)Waterm = 150 gT = 15 °Cc = 4.18 J/(g·°C)

A 200 g block of aluminium (c = 0.897 J/(g·°C)) at 140 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 15 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.897 J/(g·°C)Tmetal = 140 °Cmwater = 150 gTwater = 15 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H25 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 g of CH4 (M = 16.04 g/mol) burns completely: CH4 + 2O₂ → CO₂ + 2H₂O(l). Give q as a positive number.

ΔH°f(CH4) = −74.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = kJ
6.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

Answer key

  1. 1. ΔT = 102.9 °C
  2. 2. q = 86.94 kJ
  3. 3. Tf = 22.67 °C
  4. 4. Tf = 42.81 °C
  5. 5. q = 1388 kJ
  6. 6. ΔH° = −2802 kJ

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