We’re being asked to calculate the energy released for the reaction of a positron and an electron :

${}_{\mathbf{+}\mathbf{1}}{}^{\mathbf{0}}\mathit{e}\mathbf{+}{}_{\mathbf{-}\mathbf{1}}{}^{\mathbf{0}}\mathit{e}\mathbf{\to}\mathbf{2}\mathbf{}{}_{\mathbf{0}}{}^{\mathbf{0}}\gamma $

To calculate the energy released for the reaction, we’re going to use the following steps:

*Step 1**: Calculate the mass defect (Δm).***Step 2**: Calculate the mass defect (Δm) in kg.**Step 3**: Calculate the energy released (E).

**Step 1: Calculate the mass defect (Δm).**

**Given:**

When a positron and an electron annihilate one another, the resulting mass is completely converted to energy.

Calculate the energy associated with this process in kJ/mol.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mass Defect concept. If you need more Mass Defect practice, you can also practice Mass Defect practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Norman's class at UARK.