Chemistry Practice Problems Mass Defect Practice Problems Solution: When a positron and an electron annihilate one ano...

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Solution: 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.

Problem

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.

Solution

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

e+10+e-102 00γ


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:

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