Calculate for the total energy required when the old bonds are broken. Show full working out

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To calculate the total energy required when old bonds are broken, we need to know the specific chemical reaction taking place. Since the reaction is not provided, we will assume a common addition reaction involving an alkene and hydrogen iodide (HI), as the bond energies for $\text{C}=\text{C}$ , $\text{H}-\text{I}$ , and $\text{C}-\text{I}$ are given in the table.

Let's assume the reaction is the addition of hydrogen iodide to an alkene, for example:

\text{CH}_2=\text{CH}_2 + \text{HI} \rightarrow \text{CH}_3\text{CH}_2\text{I}

In this reaction, the "old bonds" that are broken are one $\text{C}=\text{C}$ bond and one $\text{H}-\text{I}$ bond.

Identify the bonds to be broken.
Based on the assumed reaction, the bonds broken are:
- One $\text{C}=\text{C}$ bond
- One $\text{H}-\text{I}$ bond
Retrieve the bond energy values from the provided table.
- Energy of $\text{C}=\text{C}$ bond = $614 \text{ kJ/mol}$
- Energy of $\text{H}-\text{I}$ bond = $299 \text{ kJ/mol}$
Calculate the total energy required to break these bonds.
The total energy required to break the old bonds is the sum of the energies of the $\text{C}=\text{C}$ bond and the $\text{H}-\text{I}$ bond.
$\text{Total energy required} = \text{Energy}(\text{C}=\text{C}) + \text{Energy}(\text{H}-\text{I})$ $\text{Total energy required} = 614 \text{ kJ/mol} + 299 \text{ kJ/mol}$ $\text{Total energy required} = 913 \text{ kJ/mol}$
The total energy required when the old bonds are broken is $\text{913 kJ/mol}$ .

Calculate for the total energy required when the old bonds are broken. Show full working out

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Step-by-step solution

Identify the bonds to be broken.

Retrieve the bond energy values from the provided table.

Calculate the total energy required to break these bonds.

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