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 = 250 gT1​ = 30 °C → T2​ = 95 °Cq = ?

How much heat q is needed to warm 250 g of water from 30 °C to 95 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 30 °CT2 = 95 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 400 gq = 78 kJΔT = ?

78 kJ of heat is added to 400 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 78 kJm = 400 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Zincm = 200 gT = 160 °Cc = 0.388 J/(g·°C)Waterm = 200 gT = 18 °Cc = 4.18 J/(g·°C)

A 200 g block of zinc (c = 0.388 J/(g·°C)) at 160 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 18 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.388 J/(g·°C)Tmetal = 160 °Cmwater = 200 gTwater = 18 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 250 gT = 150 °Cc = 0.385 J/(g·°C)Waterm = 250 gT = 21 °Cc = 4.18 J/(g·°C)

A 250 g block of copper (c = 0.385 J/(g·°C)) at 150 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.385 J/(g·°C)Tmetal = 150 °Cmwater = 250 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H250 g C2​H5​OHC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 g of C2H5OH (M = 46.07 g/mol) burns completely: C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l). Give q as a positive number.

ΔH°f(C2H5OH) = −277.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = kJ
6.Hard
H50 g C4​H10​2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 50 g of C4H10 (M = 58.12 g/mol) burns completely: 2C4H10 + 13O₂ → 8CO₂ + 10H₂O(l). Give q as a positive number.

ΔH°f(C4H10) = −125.6 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 = 67.92 kJ
  2. 2. ΔT = 46.65 °C
  3. 3. Tf = 30.06 °C
  4. 4. Tf = 31.88 °C
  5. 5. q = 7416 kJ
  6. 6. q = 2475 kJ

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