Chemistry, 19.12.2019 01:31 ayoismeisalex

The average bond energy (enthalpy) for a c=c double bond is 614 kj/mol and that of a c−c single bond is 348 kj/mol. estimate the energy needed to break only the π bond of the double bond of 2-butene. express your answer numerically in joules per molecule.

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Answer from: bunnles

The energy needed to break the pi bond in Joules per molecule is;

E = 4.42 × 10^(-22) J/molecule.

According to the question,

The average bond energy (enthalpy) for a C=C double bond is 614 kJ/molThat of a C−C single bond is 348 kJ/mol.

However, we must note that a double bond is made up of a pi-bond and a sigma-bond.

On the other hand, a single bond is made up of a sigma-bond.

Consequently, the energy needed to break the pi bond is given as;

E = 614 kJ/mol - 348 kJ/molE = 266 kJ/mol

However, the question requires that we express the energy in Joules per molecule.

According to Avogadro; there are 6.02 × 10²³ molecules in one mole of any substance;

Therefore, the energy needed to break the pi bond in Joules per molecule is;

E = 266/6.02 × 10²³

E = 4.42 × 10^(-22) J/molecule.

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Answer from: Izzyfizzy1

Bond energy or enthalpy is defined as the change in the heat content of the reaction. The energy needed to break the pi bonds in Joules per molecule is E= $4.42 \times 10^{-22} \text{J/molecule}$ .

Given that,

Enthalpy for C=C bond = 614 kJ/mol

Enthalpy for C-C bond = 348 kJ/mol

Sigma bonds are the single bonds, which are formed by the head to head overlapping of orbitals. Pi bonds are double or triple bonds that are formed by the perpendicular overlapping of orbitals along the axis of single bonds.

Energy required to break the pi bond will be:

E = 614 kJ/mol - 348 kJ/mol

E = 266 kJ/mol

Also, in one mole of a substance:

1 mole = 6.022 x $10^{23}$

The energy needed to break the pi bonds in Joules per molecule is:

$\text {E}&=\dfrac{266}{6.022 \times 10^{23}}\\\\\text {E}&=4.42\times 10^{23}} \text{J/molecule}$

Therefore, the energy needed to break the pi bond in Joules per molecule is 4.42 x $10^{-22}$ J/molecule.

To know more about bond energy, refer to the following link:

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Answer from: Quest

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Answer from: Quest

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The average bond energy (enthalpy) for a c=c double bond is 614 kj/mol and that of a c−c single bond...

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