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 = 1000 gT1​ = 22 °C → T2​ = 95 °Cq = ?

How much heat q is needed to warm 1000 g of water from 22 °C to 95 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 1000 gT1 = 22 °CT2 = 95 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 750 gq = 40 kJΔT = ?

40 kJ of heat is added to 750 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 40 kJm = 750 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Copperm = 150 gT = 130 °Cc = 0.385 J/(g·°C)Waterm = 400 gT = 17 °Cc = 4.18 J/(g·°C)

A 150 g block of copper (c = 0.385 J/(g·°C)) at 130 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.385 J/(g·°C)Tmetal = 130 °Cmwater = 400 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Aluminiumm = 100 gT = 150 °Cc = 0.897 J/(g·°C)Waterm = 300 gT = 19 °Cc = 4.18 J/(g·°C)

A 100 g block of aluminium (c = 0.897 J/(g·°C)) at 150 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.897 J/(g·°C)Tmetal = 150 °Cmwater = 300 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H100 g C2​H5​OHC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 100 g of C2H5OH (M = 46.07 g/mol) burns completely: C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l). Give q as a positive number.

ΔH°f(C2H5OH) = −277.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = kJ
6.Hard
H100 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 100 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

Answer key

  1. 1. q = 305.1 kJ
  2. 2. ΔT = 12.76 °C
  3. 3. Tf = 20.77 °C
  4. 4. Tf = 27.75 °C
  5. 5. q = 2967 kJ
  6. 6. q = 5550 kJ

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