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 = 750 gq = 21 kJΔT = ?

21 kJ of heat is added to 750 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 21 kJm = 750 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 1000 gq = 44 kJΔT = ?

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

q = 44 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 50 gT = 150 °Cc = 0.129 J/(g·°C)Waterm = 150 gT = 23 °Cc = 4.18 J/(g·°C)

A 50 g block of lead (c = 0.129 J/(g·°C)) at 150 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 23 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.129 J/(g·°C)Tmetal = 150 °Cmwater = 150 gTwater = 23 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 150 gT = 170 °Cc = 0.385 J/(g·°C)Waterm = 300 gT = 20 °Cc = 4.18 J/(g·°C)

A 150 g block of copper (c = 0.385 J/(g·°C)) at 170 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 20 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.385 J/(g·°C)Tmetal = 170 °Cmwater = 300 gTwater = 20 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H250 g CH3​OH2CH3​OH + 3O₂reactants2CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 g of CH3OH (M = 32.04 g/mol) burns completely: 2CH3OH + 3O₂ → 2CO₂ + 4H₂O(l). Give q as a positive number.

ΔH°f(CH3OH) = −238.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = kJ
6.Hard
HCH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction CH4 + 2O₂ → CO₂ + 2H₂O(l).

ΔH°f(CH4) = −74.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ

Answer key

  1. 1. ΔT = 6.699 °C
  2. 2. ΔT = 10.53 °C
  3. 3. Tf = 24.29 °C
  4. 4. Tf = 26.6 °C
  5. 5. q = 5668 kJ
  6. 6. ΔH° = −890.3 kJ

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