# Energy of electronWatch

#1
I have that the mass of an electron is 9.1095 x 10^-31kg
and that c = 299 792 458 m / s

Using E=mc^2 how can I calculate E?
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12 years ago
#2
Am i missing something? Can't you just substitute the values into the formula and punch them into your calculator?
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#3
oh ok, wasnyt sure if i had to convert the units to km/s or anything..
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12 years ago
#4
Nope. The mass should be in kg, and the speed of light should be in m/s.
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12 years ago
#5
Only if you want the answer in Joules.
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12 years ago
#6
no. SI for speed is m s^-1 and SI for mass is kg
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12 years ago
#7
thats the amount of max. energy u can get by converting only one electron.

Now try to to it thru one mole
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12 years ago
#8
(Original post by driving_seat)
thats the amount of max. energy u can get by converting only one electron.

Now try to to it thru one mole
That is the MINIMUM energy you can get from converting one electron (assuming you get a positron to anhialate with it, doubling that number). That is why that quantity is known was the REST mass.
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