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 = 150 gT1​ = 16 °C → T2​ = 90 °Cq = ?

How much heat q is needed to warm 150 g of water from 16 °C to 90 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 150 gT1 = 16 °CT2 = 90 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 300 gT1​ = 16 °C → T2​ = 40 °Cq = ?

How much heat q is needed to warm 300 g of water from 16 °C to 40 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 16 °CT2 = 40 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 150 gT = 120 °Cc = 0.388 J/(g·°C)Waterm = 250 gT = 16 °Cc = 4.18 J/(g·°C)

A 150 g block of zinc (c = 0.388 J/(g·°C)) at 120 °C is dropped into 250 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 = 120 °Cmwater = 250 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 150 gT = 170 °Cc = 0.129 J/(g·°C)Waterm = 400 gT = 20 °Cc = 4.18 J/(g·°C)

A 150 g block of lead (c = 0.129 J/(g·°C)) at 170 °C is dropped into 400 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 = 170 °Cmwater = 400 gTwater = 20 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H25 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 g of CH4 (M = 16.04 g/mol) burns completely: CH4 + 2O₂ → CO₂ + 2H₂O(l). Give q as a positive number.

ΔH°f(CH4) = −74.8 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. q = 46.4 kJ
  2. 2. q = 30.1 kJ
  3. 3. Tf = 21.49 °C
  4. 4. Tf = 21.72 °C
  5. 5. q = 1388 kJ
  6. 6. q = 518.7 kJ

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