The strain energy (in kJ/mol) of cyclopropane from the following data isΔfH [C3H6(g)] = 53.0 kJ/mol;

Question

The strain energy (in kJ/mol) of cyclopropane from the following data is

Δ_fH [C₃H₆(g)] = 53.0 kJ/mol;

Δ_fH [C(g)] = 715.0 kJ/mol;

Δ_fH [H(g)] = 218.0 kJ/mol

B.E. (C−C) = 356.0 kJ/mol;

B.E. (C−H) = 408.0 kJ/mol.

Accepted Answer

$3C(s) + 3H_{2}(g) ightarrow C_{3}H_{6}(g);\Delta{H	ext{ kJ}}_{\exp}$$\Delta H_{	ext{theo}} = \lbrack 3 	imes 715 + 6 	imes 218brack - \lbrack 3 	imes 356 + 6 	imes 408brack = - 63	ext{ kJ}$$	herefore	ext{ Strain energy = }\Delta H_{	ext{exp}} - \Delta H_{	ext{theo}} = 116	ext{ kJ}$

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