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 = 500 gT1​ = 15 °C → T2​ = 50 °Cq = ?

How much heat q is needed to warm 500 g of water from 15 °C to 50 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 500 gT1 = 15 °CT2 = 50 °Cc = 4.18 J/(g·°C)
q = kJ
2.Easy
waterm = 1000 gT1​ = 22 °C → T2​ = 50 °Cq = ?

How much heat q is needed to warm 1000 g of water from 22 °C to 50 °C? The specific heat of water is 4.18 J/(g·°C). Give the answer in kJ.

m = 1000 gT1 = 22 °CT2 = 50 °Cc = 4.18 J/(g·°C)
q = kJ
3.Medium
Tf​ = ?Copperm = 100 gT = 110 °Cc = 0.385 J/(g·°C)Waterm = 400 gT = 15 °Cc = 4.18 J/(g·°C)

A 100 g block of copper (c = 0.385 J/(g·°C)) at 110 °C is dropped into 400 g of water (c = 4.18 J/(g·°C)) at 15 °C in an insulated cup. Find the final temperature Tf.

mmetal = 100 gcmetal = 0.385 J/(g·°C)Tmetal = 110 °Cmwater = 400 gTwater = 15 °Ccwater = 4.18 J/(g·°C)
Tf = °C
4.Medium
Tf​ = ?Copperm = 250 gT = 190 °Cc = 0.385 J/(g·°C)Waterm = 200 gT = 21 °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 21 °C in an insulated cup. Find the final temperature Tf.

mmetal = 250 gcmetal = 0.385 J/(g·°C)Tmetal = 190 °Cmwater = 200 gTwater = 21 °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
H25 g C6​H12​O6​C6​H12​O6​ + 6O₂reactants6CO₂ + 6H₂O(l)productsq = ?

Use the standard enthalpies of formation to find the heat q released when 25 g of C6H12O6 (M = 180.16 g/mol) burns completely: C6H12O6 + 6O₂ → 6CO₂ + 6H₂O(l). Give q as a positive number.

ΔH°f(C6H12O6) = −1274 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 = 73.15 kJ
  2. 2. q = 117 kJ
  3. 3. Tf = 17.14 °C
  4. 4. Tf = 38.45 °C
  5. 5. ΔH° = −3119 kJ
  6. 6. q = 388.8 kJ

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