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 gq = 16 kJΔT = ?

16 kJ of heat is added to 150 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 16 kJm = 150 gc = 4.18 J/(g·°C)
ΔT = °C
2.Easy
waterm = 300 gq = 79 kJΔT = ?

79 kJ of heat is added to 300 g of water (c = 4.18 J/(g·°C)). Find the temperature rise ΔT.

q = 79 kJm = 300 gc = 4.18 J/(g·°C)
ΔT = °C
3.Medium
Tf​ = ?Ironm = 150 gT = 80 °Cc = 0.449 J/(g·°C)Waterm = 200 gT = 21 °Cc = 4.18 J/(g·°C)

A 150 g block of iron (c = 0.449 J/(g·°C)) at 80 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.449 J/(g·°C)Tmetal = 80 °Cmwater = 200 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 150 gT = 180 °Cc = 0.385 J/(g·°C)Waterm = 100 gT = 23 °Cc = 4.18 J/(g·°C)

A 150 g block of copper (c = 0.385 J/(g·°C)) at 180 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 23 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.385 J/(g·°C)Tmetal = 180 °Cmwater = 100 gTwater = 23 °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
H20 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 20 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. ΔT = 25.52 °C
  2. 2. ΔT = 63 °C
  3. 3. Tf = 25.4 °C
  4. 4. Tf = 42.06 °C
  5. 5. ΔH° = −2220 kJ
  6. 6. q = 1110 kJ

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