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​ = 12 °C → T2​ = 70 °Cq = ?

How much heat q is needed to warm 100 g of water from 12 °C to 70 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 100 gT1 = 12 °CT2 = 70 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 1000 gT1​ = 16 °C → T2​ = 80 °Cq = ?

How much heat q is needed to warm 1000 g of water from 16 °C to 80 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 1000 gT1 = 16 °CT2 = 80 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Ironm = 250 gT = 180 °Cc = 0.449 J/(g·°C)Waterm = 100 gT = 16 °Cc = 4.18 J/(g·°C)

A 250 g block of iron (c = 0.449 J/(g·°C)) at 180 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.449 J/(g·°C)Tmetal = 180 °Cmwater = 100 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Ironm = 200 gT = 200 °Cc = 0.449 J/(g·°C)Waterm = 150 gT = 19 °Cc = 4.18 J/(g·°C)

A 200 g block of iron (c = 0.449 J/(g·°C)) at 200 °C is dropped into 150 g of water (c = 4.18 J/(g·°C)) at 19 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.449 J/(g·°C)Tmetal = 200 °Cmwater = 150 gTwater = 19 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H250 g C2​H6​2C2​H6​ + 7O₂reactants4CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 250 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
HC2​H5​OH + 3O₂reactants2CO₂ + 3H₂O(l)productsΔH° = ?

Use the standard enthalpies of formation to find ΔH° for the reaction C2H5OH + 3O₂ → 2CO₂ + 3H₂O(l).

ΔH°f(C2H5OH) = −277.7 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 = 24.24 kJ
  2. 2. q = 267.5 kJ
  3. 3. Tf = 50.72 °C
  4. 4. Tf = 41.68 °C
  5. 5. q = 12967 kJ
  6. 6. ΔH° = −1367 kJ

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