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 = 300 gT1​ = 19 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 300 g of water from 19 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 300 gT1 = 19 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 200 gT1​ = 17 °C → T2​ = 55 °Cq = ?

How much heat q is needed to warm 200 g of water from 17 °C to 55 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 200 gT1 = 17 °CT2 = 55 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Zincm = 100 gT = 130 °Cc = 0.388 J/(g·°C)Waterm = 400 gT = 16 °Cc = 4.18 J/(g·°C)

A 100 g block of zinc (c = 0.388 J/(g·°C)) at 130 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 16 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.388 J/(g·°C)Tmetal = 130 °Cmwater = 400 gTwater = 16 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Leadm = 200 gT = 80 °Cc = 0.129 J/(g·°C)Waterm = 100 gT = 21 °Cc = 4.18 J/(g·°C)

A 200 g block of lead (c = 0.129 J/(g·°C)) at 80 °C is dropped into 100 g of water (c = 4.18 J/(g·°C)) at 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 200 gcmetal = 0.129 J/(g·°C)Tmetal = 80 °Cmwater = 100 gTwater = 21 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H25 g CH3​OH2CH3​OH + 3O₂reactants2CO₂ + 4H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 g of CH3OH (M = 32.04 g/mol) burns completely: 2CH3OH + 3O₂ → 2CO₂ + 4H₂O(l). Give q as a positive number.

ΔH°f(CH3OH) = −238.7 kJ/molΔH°f(CO₂) = −393.5 kJ/molΔH°f(H₂O, l) = −285.8 kJ/molΔH°f(O₂) = 0
q = kJ
6.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

Answer key

  1. 1. q = 45.14 kJ
  2. 2. q = 31.77 kJ
  3. 3. Tf = 18.59 °C
  4. 4. Tf = 24.43 °C
  5. 5. q = 566.8 kJ
  6. 6. ΔH° = −2220 kJ

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