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 = 400 gT1​ = 16 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 400 g of water from 16 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 400 gT1 = 16 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 150 gq = 45 kJΔT = ?

45 kJ of heat is added to 150 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 45 kJm = 150 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Copperm = 50 gT = 130 °Cc = 0.385 J/(g·°C)Waterm = 200 gT = 21 °Cc = 4.18 J/(g·°C)

A 50 g block of copper (c = 0.385 J/(g·°C)) at 130 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.385 J/(g·°C)Tmetal = 130 °Cmwater = 200 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 75 gT = 100 °Cc = 0.129 J/(g·°C)Waterm = 100 gT = 23 °Cc = 4.18 J/(g·°C)

A 75 g block of lead (c = 0.129 J/(g·°C)) at 100 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 23 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.129 J/(g·°C)Tmetal = 100 °Cmwater = 100 gTwater = 23 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H2CH3​OH + 3O₂reactants2CO₂ + 4H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2CH3OH + 3O₂ → 2CO₂ + 4H₂O(l).

ΔH°f(CH3OH) = −238.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H50 g C2​H6​2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 50 g of C2H6 (M = 30.07 g/mol) burns completely: 2C2H6 + 7O₂ → 4CO₂ + 6H₂O(l). Give q as a positive number.

ΔH°f(C2H6) = −84.7 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 = 48.49 kJ
  2. 2. ΔT = 71.77 °C
  3. 3. Tf = 23.45 °C
  4. 4. Tf = 24.74 °C
  5. 5. ΔH° = −1453 kJ
  6. 6. q = 2593 kJ

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