posted by sue .
Please help me with these two problems:
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?
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.
Thank You. I understood the first one, but I am having trouble setting up the second one. I don't know the conversion factor.
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.