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 gT1​ = 21 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 100 g of water from 21 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 100 gT1 = 21 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 1000 gq = 26 kJΔT = ?

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

q = 26 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 250 gT = 80 °Cc = 0.449 J/(g·°C)Waterm = 300 gT = 23 °Cc = 4.18 J/(g·°C)

A 250 g block of iron (c = 0.449 J/(g·°C)) at 80 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 23 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.449 J/(g·°C)Tmetal = 80 °Cmwater = 300 gTwater = 23 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 75 gT = 190 °Cc = 0.385 J/(g·°C)Waterm = 200 gT = 15 °Cc = 4.18 J/(g·°C)

A 75 g block of copper (c = 0.385 J/(g·°C)) at 190 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 15 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.385 J/(g·°C)Tmetal = 190 °Cmwater = 200 gTwater = 15 °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
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. q = 10.03 kJ
  2. 2. ΔT = 6.22 °C
  3. 3. Tf = 27.68 °C
  4. 4. Tf = 20.84 °C
  5. 5. ΔH° = −1453 kJ
  6. 6. q = 13876 kJ

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