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​ = 27 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 150 g of water from 27 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 150 gT1 = 27 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 250 gT1​ = 20 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 250 g of water from 20 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 20 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Aluminiumm = 100 gT = 190 °Cc = 0.897 J/(g·°C)Waterm = 300 gT = 24 °Cc = 4.18 J/(g·°C)

A 100 g block of aluminium (c = 0.897 J/(g·°C)) at 190 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.897 J/(g·°C)Tmetal = 190 °Cmwater = 300 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 50 gT = 170 °Cc = 0.449 J/(g·°C)Waterm = 250 gT = 21 °Cc = 4.18 J/(g·°C)

A 50 g block of iron (c = 0.449 J/(g·°C)) at 170 °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 = 50 gcmetal = 0.449 J/(g·°C)Tmetal = 170 °Cmwater = 250 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HC6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C6H12O6 + 6O₂ → 6CO₂ + 6H₂O(l).

ΔH°f(C6H12O6) = −1274 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H25 g C6​H12​O6​C6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 g of C6H12O6 (M = 180.16 g/mol) burns completely: C6H12O6 + 6O₂ → 6CO₂ + 6H₂O(l). Give q as a positive number.

ΔH°f(C6H12O6) = −1274 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 = 11.29 kJ
  2. 2. q = 26.13 kJ
  3. 3. Tf = 35.08 °C
  4. 4. Tf = 24.13 °C
  5. 5. ΔH° = −2802 kJ
  6. 6. q = 388.8 kJ

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