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 = 100 gT1​ = 27 °C → T2​ = 70 °Cq = ?

How much heat q is needed to warm 100 g of water from 27 °C to 70 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 100 gT1 = 27 °CT2 = 70 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 750 gT1​ = 11 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 750 g of water from 11 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 750 gT1 = 11 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Ironm = 150 gT = 140 °Cc = 0.449 J/(g·°C)Waterm = 300 gT = 22 °Cc = 4.18 J/(g·°C)

A 150 g block of iron (c = 0.449 J/(g·°C)) at 140 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 150 gcmetal = 0.449 J/(g·°C)Tmetal = 140 °Cmwater = 300 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 50 gT = 90 °Cc = 0.385 J/(g·°C)Waterm = 150 gT = 25 °Cc = 4.18 J/(g·°C)

A 50 g block of copper (c = 0.385 J/(g·°C)) at 90 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 25 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.385 J/(g·°C)Tmetal = 90 °Cmwater = 150 gTwater = 25 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction 2C2H6 + 7O₂ → 4CO₂ + 6H₂O(l).

ΔH°f(C2H6) = −84.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
ΔH° = kJ
6.Hard
H50 g C4​H10​2C4​H10​ + 13O₂reactants8CO₂ + 10H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 50 g of C4H10 (M = 58.12 g/mol) burns completely: 2C4H10 + 13O₂ → 8CO₂ + 10H₂O(l). Give q as a positive number.

ΔH°f(C4H10) = −125.6 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 = 17.97 kJ
  2. 2. q = 137.9 kJ
  3. 3. Tf = 28.01 °C
  4. 4. Tf = 26.94 °C
  5. 5. ΔH° = −3119 kJ
  6. 6. q = 2475 kJ

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