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 = 300 gT1​ = 30 °C → T2​ = 90 °Cq = ?

How much heat q is needed to warm 300 g of water from 30 °C to 90 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 30 °CT2 = 90 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 300 gT1​ = 15 °C → T2​ = 60 °Cq = ?

How much heat q is needed to warm 300 g of water from 15 °C to 60 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 15 °CT2 = 60 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Copperm = 100 gT = 120 °Cc = 0.385 J/(g·°C)Waterm = 300 gT = 15 °Cc = 4.18 J/(g·°C)

A 100 g block of copper (c = 0.385 J/(g·°C)) at 120 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 15 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.385 J/(g·°C)Tmetal = 120 °Cmwater = 300 gTwater = 15 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 250 gT = 200 °Cc = 0.388 J/(g·°C)Waterm = 200 gT = 17 °Cc = 4.18 J/(g·°C)

A 250 g block of zinc (c = 0.388 J/(g·°C)) at 200 °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 = 250 gcmetal = 0.388 J/(g·°C)Tmetal = 200 °Cmwater = 200 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
6.Hard
H20 g C4​H10​2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 20 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

Answer key

  1. 1. q = 75.24 kJ
  2. 2. q = 56.43 kJ
  3. 3. Tf = 18.13 °C
  4. 4. Tf = 36.03 °C
  5. 5. ΔH° = −2802 kJ
  6. 6. q = 990.2 kJ

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