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 = 1000 gq = 51 kJΔT = ?

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

q = 51 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 1000 gq = 43 kJΔT = ?

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

q = 43 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 200 gT = 130 °Cc = 0.449 J/(g·°C)Waterm = 250 gT = 20 °Cc = 4.18 J/(g·°C)

A 200 g block of iron (c = 0.449 J/(g·°C)) at 130 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 20 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.449 J/(g·°C)Tmetal = 130 °Cmwater = 250 gTwater = 20 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 150 gT = 180 °Cc = 0.449 J/(g·°C)Waterm = 300 gT = 16 °Cc = 4.18 J/(g·°C)

A 150 g block of iron (c = 0.449 J/(g·°C)) at 180 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.449 J/(g·°C)Tmetal = 180 °Cmwater = 300 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
6.Hard
H2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2C2H6 + 7O₂ → 4CO₂ + 6H₂O(l).

ΔH°f(C2H6) = −84.7 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 = 12.2 °C
  2. 2. ΔT = 10.29 °C
  3. 3. Tf = 28.7 °C
  4. 4. Tf = 24.36 °C
  5. 5. q = 13876 kJ
  6. 6. ΔH° = −3119 kJ

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