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​ = 15 °C → T2​ = 75 °Cq = ?

How much heat q is needed to warm 100 g of water from 15 °C to 75 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 100 gT1 = 15 °CT2 = 75 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 500 gT1​ = 30 °C → T2​ = 50 °Cq = ?

How much heat q is needed to warm 500 g of water from 30 °C to 50 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 500 gT1 = 30 °CT2 = 50 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 200 gT = 120 °Cc = 0.388 J/(g·°C)Waterm = 200 gT = 17 °Cc = 4.18 J/(g·°C)

A 200 g block of zinc (c = 0.388 J/(g·°C)) at 120 °C is dropped into 200 g of water (c = 4.18 J/(g·°C)) at 17 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.388 J/(g·°C)Tmetal = 120 °Cmwater = 200 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 50 gT = 80 °Cc = 0.385 J/(g·°C)Waterm = 100 gT = 22 °Cc = 4.18 J/(g·°C)

A 50 g block of copper (c = 0.385 J/(g·°C)) at 80 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 22 °C in an insulated cup. Find the final temperature Tf.

mmetal = 50 gcmetal = 0.385 J/(g·°C)Tmetal = 80 °Cmwater = 100 gTwater = 22 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H100 g C2​H6​2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 100 g of C2H6 (M = 30.07 g/mol) burns completely: 2C2H6 + 7O₂ → 4CO₂ + 6H₂O(l). Give q as a positive number.

ΔH°f(C2H6) = −84.7 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 = 25.08 kJ
  2. 2. q = 41.8 kJ
  3. 3. Tf = 25.75 °C
  4. 4. Tf = 24.55 °C
  5. 5. q = 5187 kJ
  6. 6. ΔH° = −5755 kJ

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