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 gq = 79 kJΔT = ?

79 kJ of heat is added to 100 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 79 kJm = 100 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 250 gq = 45 kJΔT = ?

45 kJ of heat is added to 250 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 45 kJm = 250 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 100 gT = 110 °Cc = 0.449 J/(g·°C)Waterm = 100 gT = 21 °Cc = 4.18 J/(g·°C)

A 100 g block of iron (c = 0.449 J/(g·°C)) at 110 °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 = 100 gcmetal = 0.449 J/(g·°C)Tmetal = 110 °Cmwater = 100 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 150 gT = 170 °Cc = 0.388 J/(g·°C)Waterm = 400 gT = 16 °Cc = 4.18 J/(g·°C)

A 150 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 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.388 J/(g·°C)Tmetal = 170 °Cmwater = 400 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
6.Hard
H25 g C2​H6​2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 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. ΔT = 189 °C
  2. 2. ΔT = 43.06 °C
  3. 3. Tf = 29.63 °C
  4. 4. Tf = 21.18 °C
  5. 5. ΔH° = −3119 kJ
  6. 6. q = 1297 kJ

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