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 = 250 gT1​ = 13 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 250 g of water from 13 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 13 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 250 gT1​ = 18 °C → T2​ = 45 °Cq = ?

How much heat q is needed to warm 250 g of water from 18 °C to 45 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 250 gT1 = 18 °CT2 = 45 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Ironm = 250 gT = 160 °Cc = 0.449 J/(g·°C)Waterm = 300 gT = 24 °Cc = 4.18 J/(g·°C)

A 250 g block of iron (c = 0.449 J/(g·°C)) at 160 °C is dropped into 300 g of water (c = 4.18 J/(g·°C)) at 24 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.449 J/(g·°C)Tmetal = 160 °Cmwater = 300 gTwater = 24 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 250 gT = 190 °Cc = 0.385 J/(g·°C)Waterm = 200 gT = 17 °Cc = 4.18 J/(g·°C)

A 250 g block of copper (c = 0.385 J/(g·°C)) at 190 °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 = 250 gcmetal = 0.385 J/(g·°C)Tmetal = 190 °Cmwater = 200 gTwater = 17 °Ccwater = 4.18 J/(g·°C)
Tf = °C
5.Hard
H100 g CH4​CH4​ + 2O₂reactantsCO₂ + 2H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 100 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
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 = 33.44 kJ
  2. 2. q = 28.21 kJ
  3. 3. Tf = 35.17 °C
  4. 4. Tf = 34.86 °C
  5. 5. q = 5550 kJ
  6. 6. ΔH° = −5755 kJ

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