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 = 500 gT1​ = 14 °C → T2​ = 60 °Cq = ?

How much heat q is needed to warm 500 g of water from 14 °C to 60 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 500 gT1 = 14 °CT2 = 60 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 150 gq = 78 kJΔT = ?

78 kJ of heat is added to 150 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 78 kJm = 150 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Zincm = 75 gT = 190 °Cc = 0.388 J/(g·°C)Waterm = 400 gT = 18 °Cc = 4.18 J/(g·°C)

A 75 g block of zinc (c = 0.388 J/(g·°C)) at 190 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 18 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.388 J/(g·°C)Tmetal = 190 °Cmwater = 400 gTwater = 18 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 150 gT = 150 °Cc = 0.129 J/(g·°C)Waterm = 250 gT = 20 °Cc = 4.18 J/(g·°C)

A 150 g block of lead (c = 0.129 J/(g·°C)) at 150 °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 = 150 gcmetal = 0.129 J/(g·°C)Tmetal = 150 °Cmwater = 250 gTwater = 20 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H50 g C3​H8​C3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 50 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
H250 g C3​H8​C3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 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

Answer key

  1. 1. q = 96.14 kJ
  2. 2. ΔT = 124.4 °C
  3. 3. Tf = 20.94 °C
  4. 4. Tf = 22.36 °C
  5. 5. q = 2517 kJ
  6. 6. q = 12584 kJ

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