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 = 300 gq = 74 kJΔT = ?

74 kJ of heat is added to 300 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 74 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 300 gq = 68 kJΔT = ?

68 kJ of heat is added to 300 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 68 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Zincm = 75 gT = 170 °Cc = 0.388 J/(g·°C)Waterm = 400 gT = 24 °Cc = 4.18 J/(g·°C)

A 75 g block of zinc (c = 0.388 J/(g·°C)) at 170 °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 = 75 gcmetal = 0.388 J/(g·°C)Tmetal = 170 °Cmwater = 400 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 75 gT = 200 °Cc = 0.129 J/(g·°C)Waterm = 100 gT = 21 °Cc = 4.18 J/(g·°C)

A 75 g block of lead (c = 0.129 J/(g·°C)) at 200 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.129 J/(g·°C)Tmetal = 200 °Cmwater = 100 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H20 g C6​H12​O6​C6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 20 g of C6H12O6 (M = 180.16 g/mol) burns completely: C6H12O6 + 6O₂ → 6CO₂ + 6H₂O(l). Give q as a positive number.

ΔH°f(C6H12O6) = −1274 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 = 59.01 °C
  2. 2. ΔT = 54.23 °C
  3. 3. Tf = 26.5 °C
  4. 4. Tf = 25.05 °C
  5. 5. q = 311 kJ
  6. 6. ΔH° = −3119 kJ

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