EJU Japan · EJU Chemistry

Thermochemistry

4 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 4 questions

Using the bond energies (kJ/mol) H–H 436, Cl–Cl 243, H–Cl 432, estimate the enthalpy change for H $_{2}$ + Cl $_{2}$ → 2HCl.
Using the bond energies (kJ/mol) N≡N 945, H–H 436, N–H 391, estimate the enthalpy change for N $_{2}$ + 3H $_{2}$ → 2NH $_{3}$ .
Using the bond energies (kJ/mol) H–H 436, F–F 155, H–F 565, estimate the enthalpy change for H $_{2}$ + F $_{2}$ → 2HF.
Using the bond energies (kJ/mol) H–H 436, Br–Br 193, H–Br 366, estimate the enthalpy change for H $_{2}$ + Br $_{2}$ → 2HBr.

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