Finding the mass after gaining elctrons

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A person accumulates a net charge of -73 µC by scuffing her feet on a rug, resulting in approximately 4.5 x 10^14 excess electrons. To find the increase in mass due to these electrons, the rest mass of an electron, which is about 9.11 x 10^-31 kg, is used. Multiplying the number of excess electrons by the mass of a single electron yields a total mass increase of around 4.1 x 10^-16 kg. This calculation illustrates the relationship between charge accumulation and mass increase in the context of electron gain. Understanding this concept is essential for solving related physics problems.
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Homework Statement


A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -73 µC. How many excess electrons does this person get?


Homework Equations



so i did 73x10^-6 / 1.602x10^19 and i got 4.5x10^14

but one of the questions is By how much does her mass increase?

The Attempt at a Solution



I have no idea how i would go about and in finding this.
 
Physics news on Phys.org
One has the number of electrons. Now what is the rest mass of an electron? Use the two numbers to determine the total mass of electrons gained.
 

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