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 = 43 kJΔT = ?

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

q = 43 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 750 gT1​ = 27 °C → T2​ = 40 °Cq = ?

How much heat q is needed to warm 750 g of water from 27 °C to 40 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 750 gT1 = 27 °CT2 = 40 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Leadm = 100 gT = 80 °Cc = 0.129 J/(g·°C)Waterm = 150 gT = 19 °Cc = 4.18 J/(g·°C)

A 100 g block of lead (c = 0.129 J/(g·°C)) at 80 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.129 J/(g·°C)Tmetal = 80 °Cmwater = 150 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Zincm = 75 gT = 80 °Cc = 0.388 J/(g·°C)Waterm = 200 gT = 21 °Cc = 4.18 J/(g·°C)

A 75 g block of zinc (c = 0.388 J/(g·°C)) at 80 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 75 gcmetal = 0.388 J/(g·°C)Tmetal = 80 °Cmwater = 200 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H25 g C4​H10​2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 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
6.Hard
H10 g C2​H6​2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 10 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 = 34.29 °C
  2. 2. q = 40.76 kJ
  3. 3. Tf = 20.23 °C
  4. 4. Tf = 22.98 °C
  5. 5. q = 1238 kJ
  6. 6. q = 518.7 kJ

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