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​ = 27 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 250 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 = 250 gT1 = 27 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 750 gT1​ = 18 °C → T2​ = 65 °Cq = ?

How much heat q is needed to warm 750 g of water from 18 °C to 65 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 750 gT1 = 18 °CT2 = 65 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Ironm = 50 gT = 110 °Cc = 0.449 J/(g·°C)Waterm = 300 gT = 15 °Cc = 4.18 J/(g·°C)

A 50 g block of iron (c = 0.449 J/(g·°C)) at 110 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 15 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.449 J/(g·°C)Tmetal = 110 °Cmwater = 300 gTwater = 15 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 150 gT = 80 °Cc = 0.897 J/(g·°C)Waterm = 200 gT = 24 °Cc = 4.18 J/(g·°C)

A 150 g block of aluminium (c = 0.897 J/(g·°C)) at 80 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.897 J/(g·°C)Tmetal = 80 °Cmwater = 200 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
HC3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C3H8 + 5O₂ → 3CO₂ + 4H₂O(l).

ΔH°f(C3H8) = −103.8 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H250 g C3​H8​C3​H8​ + 5O₂reactants3CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 g of C3H8 (M = 44.1 g/mol) burns completely: C3H8 + 5O₂ → 3CO₂ + 4H₂O(l). Give q as a positive number.

ΔH°f(C3H8) = −103.8 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 = 18.81 kJ
  2. 2. q = 147.3 kJ
  3. 3. Tf = 16.67 °C
  4. 4. Tf = 31.76 °C
  5. 5. ΔH° = −2220 kJ
  6. 6. q = 12584 kJ

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