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 gT1​ = 22 °C → T2​ = 75 °Cq = ?

How much heat q is needed to warm 250 g of water from 22 °C to 75 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 22 °CT2 = 75 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 300 gT1​ = 21 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 300 g of water from 21 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 21 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 150 gT = 190 °Cc = 0.388 J/(g·°C)Waterm = 400 gT = 24 °Cc = 4.18 J/(g·°C)

A 150 g block of zinc (c = 0.388 J/(g·°C)) at 190 °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 = 150 gcmetal = 0.388 J/(g·°C)Tmetal = 190 °Cmwater = 400 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 100 gT = 120 °Cc = 0.385 J/(g·°C)Waterm = 200 gT = 25 °Cc = 4.18 J/(g·°C)

A 100 g block of copper (c = 0.385 J/(g·°C)) at 120 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 25 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.385 J/(g·°C)Tmetal = 120 °Cmwater = 200 gTwater = 25 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l).

ΔH°f(C2H5OH) = −277.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H250 g C2​H5​OHC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 g of C2H5OH (M = 46.07 g/mol) burns completely: C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l). Give q as a positive number.

ΔH°f(C2H5OH) = −277.7 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 = 55.38 kJ
  2. 2. q = 42.64 kJ
  3. 3. Tf = 29.58 °C
  4. 4. Tf = 29.18 °C
  5. 5. ΔH° = −1367 kJ
  6. 6. q = 7416 kJ

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