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 gT1​ = 22 °C → T2​ = 40 °Cq = ?

How much heat q is needed to warm 1000 g of water from 22 °C to 40 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 1000 gT1 = 22 °CT2 = 40 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 200 gq = 73 kJΔT = ?

73 kJ of heat is added to 200 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 73 kJm = 200 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Leadm = 200 gT = 120 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 23 °Cc = 4.18 J/(g·°C)

A 200 g block of lead (c = 0.129 J/(g·°C)) at 120 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 23 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.129 J/(g·°C)Tmetal = 120 °Cmwater = 400 gTwater = 23 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 75 gT = 150 °Cc = 0.385 J/(g·°C)Waterm = 200 gT = 19 °Cc = 4.18 J/(g·°C)

A 75 g block of copper (c = 0.385 J/(g·°C)) at 150 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.385 J/(g·°C)Tmetal = 150 °Cmwater = 200 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H20 g C3​H8​C3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 20 g of C3H8 (M = 44.1 g/mol) burns completely: C3H8 + 5O₂ → 3CO₂ + 4H₂O(l). Give q as a positive number.

ΔH°f(C3H8) = −103.8 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. q = 75.24 kJ
  2. 2. ΔT = 87.32 °C
  3. 3. Tf = 24.47 °C
  4. 4. Tf = 23.37 °C
  5. 5. q = 1007 kJ
  6. 6. ΔH° = −890.3 kJ

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