# Chemistry

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What mass of electrons would be required to just neutralize the charge of 3.9 grams of protons?

• Chemistry -

The mass of one proton is 1.67 x 10^-24 grams. So 1.67 x 10^-24 g/proton x # protons = 3.9 grams.
Solve for # protons.
# electrons will be the same since the charges are the same (but opposite).
One electron has a mass of 9.11 x 10^-28 g; therefore,
9.11 x 10^-28 g x # electrons = mass of electrons.

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