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 = 200 gT1​ = 29 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 200 g of water from 29 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 200 gT1 = 29 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 500 gq = 36 kJΔT = ?

36 kJ of heat is added to 500 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 36 kJm = 500 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Aluminiumm = 50 gT = 180 °Cc = 0.897 J/(g·°C)Waterm = 100 gT = 19 °Cc = 4.18 J/(g·°C)

A 50 g block of aluminium (c = 0.897 J/(g·°C)) at 180 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.897 J/(g·°C)Tmetal = 180 °Cmwater = 100 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 50 gT = 120 °Cc = 0.129 J/(g·°C)Waterm = 300 gT = 17 °Cc = 4.18 J/(g·°C)

A 50 g block of lead (c = 0.129 J/(g·°C)) at 120 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.129 J/(g·°C)Tmetal = 120 °Cmwater = 300 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H10 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 10 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
H2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2C4H10 + 13O₂ → 8CO₂ + 10H₂O(l).

ΔH°f(C4H10) = −125.6 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ

Answer key

  1. 1. q = 21.74 kJ
  2. 2. ΔT = 17.22 °C
  3. 3. Tf = 34.6 °C
  4. 4. Tf = 17.53 °C
  5. 5. q = 555 kJ
  6. 6. ΔH° = −5755 kJ

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