Solving for mass of an alpha particle with charge-to-mass ratio????

Question

I need this question answered immediately.

The charge-to-mass ratio for an alpha particle is 4.8224 x 10^4 C/g. Based on the charge of this particle, calculate its mass in grams.

I know you're supposed to divide some value by this ratio to obtain the mass, but I dont know what value I am supposed to use.

-Yes I already read through the chapter 3 times and it only explains how Milikan used the charge to mass ratio for solving an electron's mass...

Please help me!

Answer 1

The charge is equal to twice the charge on an electron.

charge (C) divided by charge-to-mass ratio (in C/g) will give you an answer in g, which is what you want.

Actually, the question doesn't involve any knowledge (except what is in the first sentence of this answer) but does involve being able to work out the meaning of unfamiliar units.  When in doubt, make sure that your units cancel to give you the ones that you want.  That will tell you when to multiply and when to divide.

Good luck.  Over to you.