# chem

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1)How many electrons would it take to equal the mass of a proton?

2)What mass of electrons would be required to just neutralize the charge of 1.0g of protons?

• chem -

Look up the mass of the proton. Look up the mass of the electron. Set up a proportion.
Divide Mp/Me = approximately 2000 since the proton is approximately 2000 times heavier than the electron.

The charge on the proton is about +1 and that of the electron is about -1 in arbitrary units. From the mass of the proton, calculate the number of protons in 1 gram. It will take that same number of electrons.

• chem -

Thank You. I understood the first one, but I am having trouble setting up the second one. I don't know the conversion factor.

• chem -

You have your conversion factor. The mass of the proton is xx grams, whatever you looked up. So how many protons are there in 1 gram.
Look at it this way but we deal with B-Bs (you know, the pellet gun thing).
1 BB weighs 0.5 grams. How many BBs are in 1 gram of BBs. Same principle.

• chem -

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