Calculate the magnitude of ring strain energy in $(kJ / mol)$ of cyclopropane from the following data $Δ_{f} H [C_{3} H_{6} (g)] = 55; Δ_{f} H [C (g)] = 715.0; Δ_{f} H [H (g)] = 220; BE (C - C) = 355;$
$BE (C - H) = 410$
(all in $kJ / mol$ )

Question

Calculate the magnitude of ring strain energy in $(kJ / mol)$ of cyclopropane from the following data $Δ_{f} H [C_{3} H_{6} (g)] = 55; Δ_{f} H [C (g)] = 715.0; Δ_{f} H [H (g)] = 220; BE (C - C) = 355;$

$BE (C - H) = 410$

(all in $kJ / mol$ )

TestHub · Accepted Answer

Given that Δ H 4 ​ R.S.E. ​ = − B ⋅ E ⋅ ( 3 C − C + 6 C − H ) + Ring strain energy (RSE) = Δ H 1 ​ − Δ H 2 ​ − Δ H 3 ​ = Δ H 1 ​ − Δ H 2 ​ − Δ H 3 ​ + B.E ⋅ ( 3 C − C + 6 C − H ) = 55 − 2145 − 1320 + ( 3 × 355 + 6 × 410 ) = 115 kJ / mol ​

Chemistry - Thermochemistry Question with Solution | TestHub

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