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 = 1000 gq = 63 kJΔT = ?

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

q = 63 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 100 gT1​ = 12 °C → T2​ = 80 °Cq = ?

How much heat q is needed to warm 100 g of water from 12 °C to 80 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 100 gT1 = 12 °CT2 = 80 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Leadm = 75 gT = 120 °Cc = 0.129 J/(g·°C)Waterm = 300 gT = 16 °Cc = 4.18 J/(g·°C)

A 75 g block of lead (c = 0.129 J/(g·°C)) at 120 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.129 J/(g·°C)Tmetal = 120 °Cmwater = 300 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 50 gT = 170 °Cc = 0.897 J/(g·°C)Waterm = 400 gT = 18 °Cc = 4.18 J/(g·°C)

A 50 g block of aluminium (c = 0.897 J/(g·°C)) at 170 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 18 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.897 J/(g·°C)Tmetal = 170 °Cmwater = 400 gTwater = 18 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H25 g C6​H12​O6​C6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 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
H250 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 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

Answer key

  1. 1. ΔT = 15.07 °C
  2. 2. q = 28.42 kJ
  3. 3. Tf = 16.8 °C
  4. 4. Tf = 21.97 °C
  5. 5. q = 388.8 kJ
  6. 6. q = 13876 kJ

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