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​ = 24 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 500 g of water from 24 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 500 gT1 = 24 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 1000 gq = 45 kJΔT = ?

45 kJ of heat is added to 1000 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 45 kJm = 1000 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 100 gT = 100 °Cc = 0.449 J/(g·°C)Waterm = 250 gT = 19 °Cc = 4.18 J/(g·°C)

A 100 g block of iron (c = 0.449 J/(g·°C)) at 100 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.449 J/(g·°C)Tmetal = 100 °Cmwater = 250 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 250 gT = 170 °Cc = 0.385 J/(g·°C)Waterm = 250 gT = 18 °Cc = 4.18 J/(g·°C)

A 250 g block of copper (c = 0.385 J/(g·°C)) at 170 °C is dropped into 250 g of water (c = 4.18 J/(g·°C)) at 18 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.385 J/(g·°C)Tmetal = 170 °Cmwater = 250 gTwater = 18 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.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
6.Hard
H50 g C2​H6​2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 50 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 = 64.79 kJ
  2. 2. ΔT = 10.77 °C
  3. 3. Tf = 22.34 °C
  4. 4. Tf = 30.82 °C
  5. 5. ΔH° = −890.3 kJ
  6. 6. q = 2593 kJ

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